NALCO CHEMICAL CO
10-K, 1994-03-28
MISCELLANEOUS CHEMICAL PRODUCTS
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<PAGE>
 
                                                                            1993
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
 
                                   FORM 10-K
(MARK ONE)
  [X]           ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(D) OF
               THE SECURITIES EXCHANGE ACT OF 1934 [FEE REQUIRED]
                  For the fiscal year ended December 31, 1993
                                       OR
  [_]         TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(D) OF
             THE SECURITIES EXCHANGE ACT OF 1934 [NO FEE REQUIRED]
    For the transition period from                     to
                         COMMISSION FILE NUMBER 1-4957
 
                             NALCO CHEMICAL COMPANY
                     INCORPORATED IN THE STATE OF DELAWARE
                 I.R.S. EMPLOYER IDENTIFICATION NO. 36-1520480
               ONE NALCO CENTER, NAPERVILLE, ILLINOIS 60563-1198
                             TELEPHONE 708-305-1000
          SECURITIES REGISTERED PURSUANT TO SECTION 12(B) OF THE ACT:
                                                NAME OF EACH EXCHANGE ON
                                                    WHICH REGISTERED
          TITLE OF EACH CLASS
                                                 CHICAGO STOCK EXCHANGE
         COMMON STOCK PAR VALUE                 NEW YORK STOCK EXCHANGE
           $ 0.1875 PER SHARE
          SECURITIES REGISTERED PURSUANT TO SECTION 12(G) OF THE ACT:
                                      None
  Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.
                               Yes   X   No
  Indicate by check mark if disclosure of delinquent filers pursuant to Item
405 of Regulation S-K ((S) 229.405 of this chapter) is not contained herein,
and will not be contained, to the best of registrant's knowledge, in definitive
proxy or information statements incorporated by reference in Part III of this
Form 10-K or any amendment to this Form 10-K.   [X]
 
  The aggregate market value of the voting stock held by non-affiliates of the
registrant was $2,457,951,746 at February 21, 1994.*
 
  The number of shares outstanding of each of the issuer's classes of Common
Stock, as of February 21, 1994 was 68,985,285 shares of Common Stock.
 
                      DOCUMENTS INCORPORATED BY REFERENCE
  Portions of the Registrant's 1993 Annual Report to Shareholders are
incorporated by reference into Parts I and II.
 
  Portions of the Registrant's Proxy Statement dated March 18, 1994 for the
April 20, 1994 Annual Meeting of Shareholders are incorporated by reference
into Part III.
- --------------
  *Excludes reported beneficial ownership by all directors and executive
  officers of the Registrant; however, this determination does not constitute
  an admission of affiliate status for any of these stockholders.
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
 
                               TABLE OF CONTENTS
 
                                     PART I
 
<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
 <C>     <S>                                                                <C>
 Item 1  Business........................................................     1
         Executive Officers of the Registrant............................     3
 Item 2  Properties......................................................     4
 Item 3  Legal Proceedings...............................................     5
 Item 4  Submission of Matters to a Vote of Security Holders.............     5
 
                                    PART II
 
 Item 5  Market for the Registrant's Common Stock and Related Security        5
         Holder Matters..................................................
 Item 6  Selected Financial Data.........................................     5
 Item 7  Management's Discussion and Analysis of Financial Condition and      5
         Results of Operations...........................................
 Item 8  Financial Statements and Supplementary Data.....................     5
 Item 9  Changes in and Disagreements with Accountants on Accounting and
         Financial Disclosure............................................     6
 
                                    PART III
 
 Item 10 Directors and Executive Officers of the Registrant..............     6
 Item 11 Executive Compensation..........................................     6
 Item 12 Security Ownership of Certain Beneficial Owners and Management..     6
 Item 13 Certain Relationships and Related Transactions..................     6
 
                                    PART IV
 
 Item 14 Exhibits, Financial Statement Schedules and Reports on Form 8-K.     6
</TABLE>
<PAGE>
 
                                     PART I
 
ITEM 1. BUSINESS
 
  Nalco Chemical Company was incorporated in 1928 in Delaware and has its
principal executive offices at One Nalco Center, Naperville, Illinois 60563.
Its telephone number is 708-305-1000. As used in this report, "Company" and
"Nalco" refer to Nalco Chemical Company and its consolidated subsidiaries.
 
  Nalco is engaged primarily in the manufacture and sale of highly specialized
Service Chemicals. Specified financial information for Service Chemicals by
geographic area is shown in Note 2 of the Notes to Consolidated Financial
Statements in the Company's 1993 Annual Report to Shareholders and is
incorporated herein by reference.
 
  Nalco's business includes the production and sale of chemicals, technology,
services, and systems (monitoring and surveillance) used in water treatment,
pollution control, energy conservation, oil production and refining,
steelmaking, papermaking, mining and mineral processing, electricity
generation, other industrial processes, and commercial building utility
systems. Service Chemicals are developed and formulated to meet specific
customer needs. In general, they are part of value added programs designed to
help customers maintain a high level of operating performance and efficiency in
their facilities or to improve the quality of customers' end products. Nalco
products are used for purposes such as: control of scale, corrosion, foam and
fouling in cooling systems, boilers, and other equipment; clarification of
water; improved combustion; separation of liquids and solids; control of dust;
improvement of crude oil production through emulsion breaking and the secondary
and tertiary recovery of oil; lubrication and corrosion protection in rolling,
drawing and forming of metals; improved production of pulp and qualities of
paper; recovery of minerals; superabsorbent polymers for disposable diapers;
and specialized process applications in a variety of industries. The quality
and on-site availability of technical expertise provided through highly
qualified Nalco personnel are also important considerations to customers since
the effective use of the Company's products requires a substantial amount of
problem solving, monitoring, and technical assistance on the part of Nalco
employees.
 
  Service Chemicals are usually marketed through Nalco's own organization
because of the high degree of technical service required. The worldwide field
sales force is trained in the application and use of Nalco Service Chemicals,
and is supported by a marketing staff of specialists in the technology and use
of various Nalco Service Chemicals.
 
  Competitive conditions vary for Nalco depending on the industries served and
the products involved. Management believes the Company is one of the most
important worldwide suppliers of water treatment products and service chemical
programs, based on estimated sales of comparable products for industrial
customers on the process side (e.g., the manufacturing process, which a plant
uses to produce its end product) and the utility side (e.g., boilers for power
generation or cooling systems for process temperature control). All aspects of
this business are considered to be very competitive, and companies providing
similar products or programs range in size from very large multinational
companies to small local manufacturers. The number of competitors varies by
product application and ranges from a few large companies to hundreds of small
local companies. The Company's principal method of competition is based on
quality service, product performance and technology through safe, practical
applied science.
 
  In May 1993, Nalco sold Adco Products, Inc., a subsidiary which manufactured
specialty sealants and adhesives for automotive, industrial, and construction
markets. The results of Adco Products, Inc. were reported as discontinued
operations in 1991, along with the results of Day-Glo Color Corp. and the
Penray Companies. Day-Glo Color Corp. and the Penray Companies were sold in
October 1991 and June 1992, respectively. On February 3, 1994, Nalco and Exxon
Chemical Company, a division of Exxon Corporation, announced that they had
signed a memorandum of understanding to form a worldwide energy chemicals joint
venture. The joint venture will include Nalco's U.S. Petroleum Chemicals
Division business units, certain petroleum chemical product lines of its
international operations, and Exxon Chemical Company's Energy Chemicals
worldwide business. The new company, to be named Nalco/Exxon Energy Chemicals,
is
 
                                       1
<PAGE>
 
ITEM 1. BUSINESS (CONT'D)
 
targeted to start up and begin operations by mid-1994, pending government and
regulatory approvals and definitive agreements between the two companies. On
that same date, the Company announced that it had entered into a letter of
intent to sell its Freeport, Texas plant and its automotive paint spray booth
business to PPG Industries, Inc. The Freeport plant, which has 27 Nalco
employees, produces chemical products for the oil production and refining
market. It is expected that the Nalco/Exxon Energy Chemicals joint venture will
purchase certain of its requirements for these products from PPG. Nalco's
worldwide automotive paint spray booth business, approximately $10 million in
size, is also included in the proposed sale to PPG. Nalco has agreed to sell
and service the water treatment related applications for PPG in the automotive
facilities associated with the business sold. There were no other significant
changes in the markets served or in the methods of distribution since the
beginning of 1993.
 
  Although no single Service Chemicals product represents a material portion of
the business, historically, new product and new market developments have been
designed to increase market penetration and to maintain sales and earnings
growth.
 
OTHER MATTERS
 
  The principal raw materials used by Nalco ordinarily are available in
adequate quantities from several sources of supply in the United States and in
foreign countries. Purchases of chemicals are made in the ordinary course of
business and in accordance with the requirements of production.
 
  Inventories of Service Chemicals are maintained in Nalco-owned facilities and
in warehouses situated throughout the United States and in countries in which
subsidiaries operate. Shipments to customers may be made from either
manufacturing plants or warehouse stocks.
 
  Nalco owns or is licensed under a large number of patents relating to a
number of products and processes. Nalco's rights under such patents and
licenses are of significant importance in the operation of the business, but no
single patent or license is believed to be material with respect to its
business. Over 700 patents existed at the end of 1993 with remaining durations
ranging from less than one year to 17 years with an average duration of about
10 years.
 
  Nalco's business is considered nonseasonal. Large dollar amounts of backlogs
are unusual since chemicals are normally shipped within a few days of the
receipt of orders. The dollar amount of the normal backlog of orders is not
considered to be significant in relation to the total annual dollar volume of
sales of Nalco.
 
  The Company does not depend upon either a single customer, or very few
customers, for a material part of the business.
 
  Nalco's laboratories are involved in research and development of chemical
products and in providing technical support, including analyses of samples.
Research and development expenses of continuing operations amounted to $50.4
million in 1993, compared to $48.0 million in 1992, and $45.9 million in 1991.
 
  There were approximately 6,800 persons employed full time by Nalco at the end
of 1993.
 
  Compliance with Federal, State, and local regulations relating to the
discharge of materials into the environment, or otherwise relating to the
protection of the environment, has not had a material effect upon the capital
expenditures, earnings, or competitive position of Nalco. There are no material
capital expenditures for environmental control facilities anticipated during
1994. Compliance with increasingly stringent regulations should not have a
material effect upon earnings but may strengthen the competitive position of
Nalco because of available capital and technical resources.
 
  Although inflation is not a significant factor domestically, the Company
adjusts selling prices to maintain profit margins wherever possible.
Investments are made in modern plants and equipment that will increase
 
                                       2
<PAGE>
 
ITEM 1. BUSINESS (CONT'D)
 
productivity and thereby minimize the effect of rising costs. In addition, the
last-in, first-out (LIFO) valuation method is used for 59 percent of the
Company's inventories, which ensures that changing material costs are
recognized in reported income; more importantly, these costs are recognized in
pricing decisions. The impact of inflation in foreign exchange movements at
foreign subsidiaries is managed by minimizing assets exposed to currency
movements and by increasing sales prices to parallel increases in the local
inflation rate. The Company emphasizes working capital management, frequent
dividend remittance, timely settlement of intercompany account balances,
foreign currency borrowings, and selected hedging. In most hyperinflationary
economies, the rate of local currency devaluation is related to and
approximately equal to the local inflation rate. Therefore, Nalco attempts to
increase its local selling prices to help offset the impact of devaluation on
exposed assets and the impact of increases in local content costs.
 
EXECUTIVE OFFICERS OF THE REGISTRANT
 
  The executive officers of the Registrant are named below together with their
principal occupation. During the last 5 years all of the executive officers
have been employed by the Company, as indicated, except for W. E. Buchholz.
 
  W. H. Clark has been Chief Executive Officer of the Company since 1982 and
Chairman of the Board since 1984. He also served as President from 1982 to
1990.
 
  E. J. Mooney has been Chief Operating Officer since 1992 and President of the
Company since 1990. He had been an Executive Vice President since 1988.
 
  M. B. Harp has been Executive Vice President, International Operations since
January 1993. He had been a Group Vice President since 1988.
 
  W. S. Weeber has been Executive Vice President, Operations Staff since
January 1993. He had been a Group Vice President since 1986.
 
  P. Dabringhausen has been Group Vice President and President, Process
Chemicals Division since January 1993. He had been a Vice President since 1991,
and was President, Nalco Pacific from 1989 to 1992 and an International
Division Vice President, Marketing from 1987 to 1989.
 
  S. D. Newlin was elected Group Vice President, President, Nalco Europe on
March 1, 1994. He had been Vice President, President, Nalco Pacific since
December 1992. From January 1992 to December 1992 he was General Manager, Pulp
and Paper Chemicals Group; from 1990 to 1992 he was General Manager of
UNISOLV(R); and from 1987 to 1990 he was General Manager, WATERGY(R).
 
  J. D. Tinsley has been Group Vice President and President, Water and Waste
Treatment Division since January 1993. From March to December 1992, he was a
Group Vice President and President, Process Chemicals Division, and from 1986
to 1992 he was Vice President, Corporate Development.
 
  W. E. Buchholz has been Vice President and Chief Financial Officer since
January 1993. He was formerly Vice President--Finance and Chief Financial
Officer for Cincinnati Milacron, Inc. (a manufacturer of industrial equipment,
supplies and services for the metal cutting and plastic processing industries)
since 1987.
 
  The corporate officers of the Registrant are usually elected at the annual
meeting of directors and hold office for a term of one year.
 
  There is no family relationship between any of the executive officers. No
arrangement or understanding exists between the executive officers and any
other person pursuant to which such officers were selected as officers of the
Registrant.
 
  For further information on the executive officers of the Registrant, please
refer to the inside back cover of the Company's 1993 Annual Report to
Shareholders, which is incorporated herein by reference.
 
                                       3
<PAGE>
 
ITEM 2. PROPERTIES
 
  Nalco has facilities used to produce and store inventories and service
customer needs at 16 domestic and 27 foreign locations. Primary domestic
manufacturing plants are located in:
 
<TABLE>
<CAPTION>
                                                         LAND AREA BUILDING AREA
                                                          (ACRES)     (SQ.FT.)
                                                         --------- -------------
      <S>                                                <C>       <C>
      Carson, California................................     21        84,000
      Jonesboro, Georgia................................     12        35,000
      Chicago, Illinois
         6216 West 66th Place...........................     42       856,000
        9165 South Harbor Avenue........................      5       104,000
      Garyville, Louisiana..............................    251       235,000
      Paulsboro, New Jersey.............................     14        33,000
      Freeport, Texas...................................    139        36,000
      Sugar Land, Texas.................................     30       246,000
</TABLE>
                                                     (East & West     (East
                                                     facilities)      facility)
 
  Other domestic manufacturing and/or warehouse facilities are located in:
Kenai, Alaska; Bakersfield, California; Hobbs, New Mexico; Oklahoma City,
Oklahoma; Odessa, Texas; Clarksburg, West Virginia; Vancouver, Washington; and
Evansville, Wyoming.
 
  The general offices of the Company are located on a 146-acre site in
Naperville, Illinois. This facility includes three five-story buildings
totaling 417,000 square feet. About 317,000 square feet is used for office
space and the balance is used for support services and storage. A power plant
with a dual energy system (steam and electricity) serves both the Corporate and
Technical Centers and has 31,000 square feet of space.
 
  Primary domestic research facilities are located in Naperville, Illinois and
Sugar Land, Texas. The Naperville Technical Center is adjacent to the Corporate
Center and houses process simulation areas and a technical library in buildings
which total 235,000 square feet. The Sugar Land West facility has process
simulation areas and a technical library. Total building area at this facility
is about 202,000 square feet.
 
  Primary foreign manufacturing plants, which also generally include laboratory
and office facilities, are located in:
 
<TABLE>
<CAPTION>
                                                         LAND AREA BUILDING AREA
                                                          (ACRES)     (SQ.FT.)
                                                         --------- -------------
      <S>                                                <C>       <C>
      Botany, Australia.................................     10       102,000
      Vienna, Austria...................................      4        45,000
      Suzano, Brazil....................................     14        81,000
      Burlington, Canada................................     14       138,000
      Soledad, Colombia.................................      6        27,000
      Cheshire, England.................................     15       226,000
      Douvrin-Billy Berclau, France.....................     25        23,000
      Biebesheim, Germany...............................     28       103,000
      Tilburg, The Netherlands..........................      6        31,000
      Cisterna di Latina, Italy.........................     25        88,000
      Celra, Spain......................................     25       109,000
      Jordbro, Sweden...................................      4        28,000
      Anaco, Venezuela..................................     43        76,000
</TABLE>
 
  Other foreign facilities are located in: Perth, Australia; Buenos Aires,
Argentina; Edmonton, Canada; Santiago, Chile; Quito, Ecuador; Maurepas, France;
Bogor, Indonesia; Kashima, Japan; Auckland, New Zealand; Calamba, Laguna,
Philippines; Dammam, Saudi Arabia; Jurong Town, Singapore; Hsin Chu Hsien,
Taiwan; and Maracaibo, Venezuela.
 
                                       4
<PAGE>
 
ITEM 2. PROPERTIES (CONT'D)
 
  In 1992, the Company acquired 12 acres of land in Oegstgeest, The
Netherlands, for the purpose of constructing a business and technical center to
serve Nalco customers throughout Europe. Construction of this 88,000 square-
foot facility is in process, and it is scheduled for completion in 1994.
 
  In addition to the property mentioned above, Nalco occupies general and sales
offices and warehouses which are rented under short-term leases. Except for
land leased in the Philippines, Saudi Arabia, Chile, Ecuador and Argentina, all
other real property (including all production facilities) is owned by Nalco.
 
  While the plants are of varying ages, the Company believes that they are well
maintained, are equipped with modern and efficient equipment, and are in good
operating condition and suitable for the purposes for which they are being
used.
 
  Capital expenditures for 1994 should remain near the $117.8 million spent in
1993, if planned sales and earnings for 1994 are reached.
 
ITEM 3. LEGAL PROCEEDINGS.
 
  For information on this item, please refer to Note 15 of the Notes to
Consolidated Financial Statements in the Company's 1993 Annual Report to
Shareholders, which is incorporated herein by reference.
 
ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS.
 
  Not Applicable.
 
                                    PART II
 
ITEM 5. MARKET FOR THE REGISTRANT'S COMMON STOCK AND RELATED SECURITY HOLDER
MATTERS.
 
  The Registrant's Common Stock is listed on the New York and Chicago Stock
Exchanges. The number of holders of record of Common Stock, par value $0.1875
per share, at December 31, 1993 was 6,111. Dividends and Common Stock market
prices included in the Quarterly Summary in the Company's 1993 Annual Report to
Shareholders are incorporated herein by reference.
 
ITEM 6. SELECTED FINANCIAL DATA.
 
  Selected Financial Data including net sales, earnings from continuing
operations, earnings from continuing operations per common share, total assets,
long-term debt, and cash dividends paid are reported in the Eleven Year Summary
in the Company's 1993 Annual Report to Shareholders and are incorporated herein
by reference.
 
ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
OF OPERATIONS.
 
 Financial Condition and Results of Operations
 
  Management's discussion and analysis of financial condition and results of
operations which is included in the sections titled "Management's Discussion
and Analysis--Results of Operations" and "Management's Discussion and
Analysis--Financial Condition" in the Company's 1993 Annual Report to
Shareholders is incorporated herein by reference.
 
 Liquidity and Capital Resources
 
  Management's discussion of liquidity and capital resources which is included
in the section titled "Management's Discussion and Analysis--Cash Flows" in the
Company's 1993 Annual Report to Shareholders is incorporated herein by
reference.
 
ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA.
 
  The Report of Independent Accountants, the Consolidated Financial Statements,
and the Notes to Consolidated Financial Statements of the Registrant and its
subsidiaries, included in the Company's 1993 Annual Report to Shareholders, are
incorporated herein by reference. The Reports of Independent Auditors, which
were included in the Company's 1992 and 1991 Annual Reports to Shareholders,
are incorporated herein by reference from the Registrant's Form 10-K for the
years ended 1992 and 1991.
 
  The Quarterly Summary in the Company's 1993 Annual Report to Shareholders is
incorporated herein by reference.
 
                                       5
<PAGE>
 
ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
FINANCIAL DISCLOSURE.
 
  The information called for hereunder has been previously reported (as defined
in Rule 12b-2 under the Securities and Exchange Act of 1934) in the
Registrant's Form 8-K dated February 16, 1993 and Form 8 dated April 14, 1993.
 
                                    PART III
 
ITEM 10. DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT.
 
  Item 10 information is set forth in Part I, Item 1, page 3 and also in the
Company's Proxy Statement dated March 18, 1994, under Election of Directors
through Election of Directors--Meetings of the Board and Committees of the
Board, which is incorporated herein by reference.
 
ITEM 11. EXECUTIVE COMPENSATION.
 
  The information contained under Election of Directors--Directors'
Remuneration and Retirement Policies through Election of Directors--Change in
Control in the Company's Proxy Statement dated March 18, 1994, with respect to
executive compensation and transactions, is incorporated herein by reference in
response to this item.
 
ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT.
 
  The information contained under Shares Outstanding and Voting Rights in the
Company's Proxy Statement dated March 18, 1994, with respect to security
ownership of certain beneficial owners and management, is incorporated herein
by reference in response to this item.
 
ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS.
 
  None.
 
                                    PART IV
 
ITEM 14. EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K.
 
  (a)(1) The following consolidated financial statements of the Registrant and
its subsidiaries included in the Company's 1993 Annual Report to Shareholders
are incorporated herein by reference in Item 8:
 
<TABLE>
<CAPTION>
                                                          ---
   <S>                                                    <C>
   Statements of Consolidated Financial Condition
    December 31, 1993, 1992 and 1991
   Statements of Consolidated Earnings
    Years ended December 31, 1993, 1992 and 1991
   Statements of Consolidated Cash Flows
    Years ended December 31, 1993, 1992 and 1991
   Statement of Consolidated Common Shareholders' Equity
    Years ended December 31, 1993, 1992 and 1991
   Notes to Consolidated Financial Statements
   Quarterly Summary (Unaudited)
    Years ended December 31, 1993 and 1992
   Report of Independent Accountants
</TABLE>
 
  The Reports of Independent Auditors, which were included in the Company's
1992 and 1991 Annual Reports to Shareholders, are incorporated herein by
reference from the Registrant's Form 10-K for the years ended 1992 and 1991.
 
  (2) The following consolidated financial statement schedules for the years
1993, 1992 and 1991 are submitted herewith:
 
  Report of Independent Accountants on Financial Statement Schedules
 
<TABLE>
   <C>           <S>                                                      <C>
   ScheduleV     --Property, Plant and Equipment
   ScheduleVI    --Accumulated Depreciation, Depletion and Amortization
                  of Property, Plant and Equipment
   Schedule VIII --Valuation and Qualifying Accounts
   ScheduleIX    --Short-Term Borrowings
   Schedule X    --Supplementary Income Statement Information
</TABLE>
 
 
                                       6
<PAGE>
 
ITEM 14. EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K
(CONT'D)
  All other schedules for which provision is made in the applicable accounting
regulations of the Securities and Exchange Commission are not required under
the related instructions or are inapplicable, and therefore have been omitted.
 
  (3) Exhibits
 
<TABLE>
<CAPTION>
                                                                            ---
   <C>     <C> <S>                                                          <C>
   Exhibit  3A --Restated Certificate of Incorporation/2/
   Exhibit  3B --Certificates of Correction and Amendment to the Restated
                Certificate of Incorporation/8/
   Exhibit  3C --Certificate of Designations, Preferences and Rights of
                Series B ESOP Convertible Preferred Stock/4/
   Exhibit  3D --By-laws/1//0/
   Exhibit 10A --Form of Key Executive Agreement/1/
           10B --Agreements to Restore Benefits Reduced by Excess ERISA-
                Related Limits/1/
           10C --Form of Death Benefit Agreement/2/
           10D --Management Incentive Plan/2/
           10E --Performance Unit Plan/2/
           10F --Restricted Stock Plan/8/
           10G --1982 Stock Option Plan as amended April 16, 1984,
                January 30, 1987, and February 12, 1993/1//0/
           10H --Deferred Compensation Plan for Directors/3/
           10I --Supplemental Retirement Income Plan/6/
           10J --1990 Stock Option Plan as amended April 23, 1992, and
                February 12, 1993/1//0/
           10K --Stock Option Plan for Non-Employee Directors/1//0/
           10L --Directors Benefit Protection Trust of Nalco Chemical
                Company/6/
           10M --Management Benefit Protection Trust of Nalco Chemical
                Company/6/
           10N --Restricted Stock Trust of Nalco Chemical Company/6/
           10O --Performance Share Plan/9/
   Exhibit 11  --Computation of Earnings Per Share
   Exhibit 13  --Those portions of the 1993 Annual Report to Shareholders
                expressly incorporated herein by reference
   Exhibit 21  --Subsidiaries of the Registrant
   Exhibit 23  --Consent of Independent Accountants
   Exhibit 99A --Notice of Annual Meeting and Proxy Statement/1//1/
   Exhibit 99B --August 7, 1986 and June 26, 1989 Letters to Shareholders
                with Summaries of the Preferred Share Purchase Rights
                Agreement as amended/5/
   Exhibit 99C --Reports of Other Auditors/1//0/
   Exhibit Nos. 10A-10O constitute management contracts, compensation
   plans, or arrangements covering directors and officers of the Company.
</TABLE>
 
  (b) Reports on Form 8-K filed in the fourth quarter of 1993 are: None
- --------
 /1/Incorporated herein by reference from the Registrant's Form 10-K for the
 year ended 1986.
 /2/Incorporated herein by reference from the Registrant's Form 10-K for the
 year ended 1987.
 /3/Incorporated herein by reference from the Registrant's Form 8-K dated July
 24, 1986.
 /4/Incorporated herein by reference from the Registrant's Form 8-K dated May
 15, 1989.
 /5/Incorporated herein by reference from the Registrant's Form 10-K for the
 year ended 1989.
 /6/Incorporated herein by reference from the Registrant's Form 10-K for the
 year ended 1990.
 /7/Incorporated herein by reference from the Registrant's Form 10-Q for the
 quarter ended September 30, 1992.
 /8/Incorporated herein by reference from the Registrant's Form 10-K for the
 year ended 1991.
 /9/Incorporated herein by reference from the Registrant's March 16, 1992 Proxy
 Statement.
/1//0/Incorporated herein by reference from the Registrant's Form 10-K for the
 year ended 1992.
/1//1/Incorporated herein by reference from the Registrant's Notice of Annual
 Meeting and Proxy Statement dated March 18, 1994.
 
                                       7
<PAGE>
 
                                   SIGNATURES
 
  PURSUANT TO THE REQUIREMENTS OF SECTION 13 OR 15(D) OF THE SECURITIES
EXCHANGE ACT OF 1934, THE COMPANY HAS DULY CAUSED THIS REPORT TO BE SIGNED ON
ITS BEHALF BY THE UNDERSIGNED, THEREUNTO DULY AUTHORIZED.
 
                                          NALCO CHEMICAL COMPANY
 
                                                        W. H. Clark
                                          By___________________________________
                                                        W. H. Clark
                                               Chairman and Chief Executive
                                                          Officer
 
                                          Date: March 25, 1994
 
 
  PURSUANT TO THE REQUIREMENTS OF THE SECURITIES EXCHANGE ACT OF 1934, THIS
REPORT HAS BEEN SIGNED BELOW ON MARCH 25, 1994 BY THE FOLLOWING PERSONS ON
BEHALF OF THE REGISTRANT AND IN THE CAPACITIES INDICATED.
 
<TABLE>
<CAPTION>
              SIGNATURE               TITLE
              ---------               -----
 <C>                                  <S>
            W. E. Buchholz
 ------------------------------------
            W. E. Buchholz            Vice President and Chief
                                       Financial Officer
            R. L. Ratliff
 ------------------------------------
            R. L. Ratliff             Controller
            H. G. Bernthal
 ------------------------------------
            H. G. Bernthal            Director
             W. H. Clark
 ------------------------------------
             W. H. Clark              Director, Chairman and Chief Executive
                                       Officer
              H. Corless
 ------------------------------------
              H. Corless              Director
              H. M. Dean
 ------------------------------------
              H. M. Dean              Director
          J. P. Frazee, Jr.
 ------------------------------------
          J. P. Frazee, Jr.           Director
             A. L. Kelly
 ------------------------------------
             A. L. Kelly              Director
            F. A. Krehbiel
 ------------------------------------
            F. A. Krehbiel            Director
             E. J. Mooney
 ------------------------------------
             E. J. Mooney             Director
             C. W. Parry
 ------------------------------------
             C. W. Parry              Director
             W. A. Pogue
 ------------------------------------
             W. A. Pogue              Director
              J. J. Shea
 ------------------------------------
              J. J. Shea              Director
</TABLE>
 
                                       8
<PAGE>
 
                      REPORT OF INDEPENDENT ACCOUNTANTS ON
                         FINANCIAL STATEMENT SCHEDULES
 
To the Board of Directors
of Nalco Chemical Company
 
  Our audit of the consolidated financial statements referred to in our report
dated January 25, 1994, except as to Note 17, which is as of February 3, 1994,
appearing on page 16 of the 1993 Annual Report of Nalco Chemical Company (which
report and consolidated financial statements are incorporated by reference in
this Annual Report on Form 10-K) also included an audit of the Financial
Statement Schedules listed in Item 14(a) of this Form 10-K. In our opinion,
these Financial Statement Schedules present fairly, in all material respects,
the information set forth therein when read in conjunction with the related
consolidated financial statements.
 
                                          PRICE WATERHOUSE
 
Chicago, Illinois
January 25, 1994
 
                                       9
<PAGE>
 
                    NALCO CHEMICAL COMPANY AND SUBSIDIARIES
 
                                --------------
 
                   SCHEDULE V--PROPERTY, PLANT AND EQUIPMENT
 
<TABLE>
<CAPTION>
COL. A                       COL. B        COL. C         COL. D           COL. E             COL. F
- ------                   -------------- ------------    -----------    ---------------    --------------
                           BALANCE AT                                  OTHER CHANGES--       BALANCE
                           BEGINNING     ADDITIONS                     ADD (DEDUCT)--         AT END
     CLASSIFICATION        OF PERIOD      AT COST       RETIREMENTS       DESCRIBE          OF PERIOD
     --------------      -------------- ------------    -----------    ---------------    --------------
<S>                      <C>            <C>             <C>            <C>                <C>
Year ended December 31,
 1993
  Land.................. $   37,418,000 $    358,000    $   110,000     $   (592,000)(E)  $   39,124,000
                                                                           2,050,000 (F)
  Buildings.............    207,027,000   13,616,000      1,625,000       (3,748,000)(E)     215,225,000
                                                                             (45,000)(F)
  Machinery and
   equipment............    799,779,000  103,851,000     22,934,000(B)   (10,508,000)(E)     871,563,000
                                                                           1,375,000 (F)
                         -------------- ------------    -----------     ------------      --------------
    Total............... $1,044,224,000 $117,825,000(A) $24,669,000     $(11,468,000)     $1,125,912,000
                         ============== ============    ===========     ============      ==============
Year ended December 31,
 1992
  Land.................. $   33,621,000 $  4,837,000    $     9,000     $ (1,031,000)(E)  $   37,418,000
  Buildings.............    203,599,000    7,626,000        287,000       (3,840,000)(E)     207,027,000
                                                                             (71,000)(G)
  Machinery and
   equipment............    720,549,000  118,523,000     27,239,000(B)   (11,364,000)(E)     799,779,000
                                                                            (690,000)(G)
                         -------------- ------------    -----------     ------------      --------------
    Total............... $  957,769,000 $130,986,000(A) $27,535,000     $(16,996,000)     $1,044,224,000
                         ============== ============    ===========     ============      ==============
Year ended December 31,
 1991
  Land.................. $   31,076,000 $     21,000    $ 1,956,000     $   (234,000)(E)  $   33,621,000
                                                                           5,997,000 (H)
                                                                          (1,283,000)(I)
  Buildings.............    200,148,000    8,304,000     10,954,000(C)    (2,315,000)(E)     203,599,000
                                                                          17,197,000 (H)
                                                                          (8,781,000)(I)
  Machinery and
   equipment............    609,104,000  128,502,000     42,255,000(D)    (5,616,000)(E)     720,549,000
                                                                          40,380,000 (H)
                                                                          (9,566,000)(I)
                         -------------- ------------    -----------     ------------      --------------
    Total............... $  840,328,000 $136,827,000(A) $55,165,000     $ 35,779,000      $  957,769,000
                         ============== ============    ===========     ============      ==============
</TABLE>
- --------
Note A--Additions represent expansion of production, distribution, laboratory
     and other facilities. The more significant 1993 expenditures are
     described on page 20 of the 1993 Annual Report to Shareholders.
Note B--Mainly the retirement of transportation equipment.
Note C--Mainly the sale of Day-Glo Color Corp.
Note D--Mainly the sale of Day-Glo Color Corp. and the retirement of
     transportation equipment.
Note E--Foreign currency translation adjustments.
Note F--December 1992 net change; the fiscal year end of the consolidated
     foreign subsidiaries was changed from November 30 to December 31.
Note G--Reclassification of additions of Adco Products, Inc. and the Penray
     Companies to Net Assets of Discontinued Operations.
Note H--Acquisition of Alchem, Inc., Catoleum (Pty.) Ltd., and Nalfloc
     Limited.
Note I--Reclassification of assets of Adco Products, Inc. and the Penray
     Companies to Net Assets of Discontinued Operations.
 
                                      10
<PAGE>
 
                    NALCO CHEMICAL COMPANY AND SUBSIDIARIES
 
                                --------------
 
             SCHEDULE VI--ACCUMULATED DEPRECIATION, DEPLETION AND
                 AMORTIZATION OF PROPERTY, PLANT AND EQUIPMENT
 
<TABLE>
<CAPTION>
COL. A                      COL. B       COL. C      COL. D        COL. E           COL. F
- ------                   ------------ ------------ ----------- --------------    ------------
                                       ADDITIONS                   OTHER
                          BALANCE AT   CHARGED TO                CHANGES--         BALANCE
                          BEGINNING      COSTS                 ADD (DEDUCT)--       AT END
      DESCRIPTION         OF PERIOD   AND EXPENSES RETIREMENTS    DESCRIBE        OF PERIOD
      -----------        ------------ ------------ ----------- --------------    ------------
<S>                      <C>          <C>          <C>         <C>               <C>
Year ended December 31,
 1993
  Buildings............. $ 76,483,000 $ 6,362,000  $   647,000  $(1,367,000)(A)  $ 80,918,000
                                                                     87,000 (B)
  Machinery and
   equipment............  434,490,000  76,333,000   14,968,000   (7,521,000)(A)   490,450,000
                                                                  2,116,000 (B)
                         ------------ -----------  -----------  -----------      ------------
    Total............... $510,973,000 $82,695,000  $15,615,000  $(6,685,000)     $571,368,000
                         ============ ===========  ===========  ===========      ============
Year ended December 31,
 1992
  Buildings............. $ 70,451,000 $ 6,652,000  $     9,000  $  (611,000)     $ 76,483,000
  Machinery and
   equipment............  393,753,000  68,442,000   20,987,000   (6,718,000)      434,490,000
                         ------------ -----------  -----------  -----------      ------------
    Total............... $464,204,000 $75,094,000  $20,996,000  $(7,329,000)(A)  $510,973,000
                         ============ ===========  ===========  ===========      ============
Year ended December 31,
 1991
  Buildings............. $ 66,072,000 $ 6,479,000  $ 2,126,000  $  (869,000)(A)  $ 70,451,000
                                                                  2,434,000 (C)
                                                                 (1,539,000)(D)
  Machinery and
   equipment............  354,987,000  58,067,000   22,786,000   (4,095,000)(A)   393,753,000
                                                                 13,564,000 (C)
                                                                 (5,984,000)(D)
                         ------------ -----------  -----------  -----------      ------------
    Total............... $421,059,000 $64,546,000  $24,912,000  $ 3,511,000      $464,204,000
                         ============ ===========  ===========  ===========      ============
</TABLE>
- --------
Note A--Foreign currency translation adjustments.
Note B--December 1992 net change; the fiscal year end of the consolidated
     foreign subsidiaries was changed from November 30 to December 31.
Note C--Acquisition of Alchem, Inc., Catoleum (Pty.) Ltd., and Nalfloc
     Limited.
Note D--Reclassification of assets of Adco Products, Inc. and the Penray
     Companies to Net Assets of Discontinued Operations.
 
                                      11
<PAGE>
 
                    NALCO CHEMICAL COMPANY AND SUBSIDIARIES
 
                                --------------
 
                SCHEDULE VIII--VALUATION AND QUALIFYING ACCOUNTS
 
<TABLE>
<CAPTION>
COL. A                      COL. B           COL. C             COL. D         COL. E
- ------                    ---------- ----------------------- ------------    ----------
                                            ADDITIONS
                                     -----------------------
                                                     (2)
                                         (1)       CHARGED
                          BALANCE AT   CHARGED     TO OTHER                   BALANCE
                          BEGINNING    TO COSTS   ACCOUNTS-- DEDUCTIONS--      AT END
      DESCRIPTION         OF PERIOD  AND EXPENSES  DESCRIBE    DESCRIBE      OF PERIOD
      -----------         ---------- ------------ ---------- ------------    ----------
<S>                       <C>        <C>          <C>        <C>             <C>
Reserves deducted in the
 Statements of
 Consolidated Financial
 Condition from the
 assets to which they
 apply
  Allowance for doubtful
   accounts Year ended:
    December 31, 1993...  $5,879,000  $  716,000              $2,125,000 (A) $4,470,000
                          ==========  ==========     ===      ==========     ==========
    December 31, 1992...  $4,756,000  $2,947,000              $1,824,000 (A) $5,879,000
                          ==========  ==========     ===      ==========     ==========
                                                              $1,213,000 (A)
                                                                 287,000 (B)
                                                                (585,000)(C)
                                                     ---      ----------
    December 31, 1991...  $4,940,000  $  731,000              $  915,000     $4,756,000
                          ==========  ==========     ===      ==========     ==========
</TABLE>
- --------
Note A--Excess of accounts written off over recoveries.
Note B--U.S. Subsidiaries' allowance for doubtful accounts reclassified to Net
 Assets of Discontinued Operations.
Note C--Allowance for doubtful accounts of Alchem, Inc., Catoleum (Pty) Ltd.,
 and Nalfloc Limited at date of acquisition.
 
                                       12
<PAGE>
 
                    NALCO CHEMICAL COMPANY AND SUBSIDIARIES
 
                                --------------
 
                      SCHEDULE IX--SHORT-TERM BORROWINGS
 
<TABLE>
<CAPTION>
         COL. A            COL. B     COL. C        COL. D      COL. E      COL. F
    ----------------     ----------- --------    ------------ ----------- ----------
                                                                           WEIGHTED
                                                   MAXIMUM      AVERAGE    AVERAGE
                                     WEIGHTED       AMOUNT      AMOUNT     INTEREST
                                     AVERAGE     OUTSTANDING  OUTSTANDING    RATE
                         BALANCE AT  INTEREST     DURING THE   DURING THE DURING THE
 CATEGORY OF BORROWINGS  END OF YEAR   RATE          YEAR       YEAR(D)     YEAR(E)
 ----------------------  ----------- --------    ------------ ----------- ----------
<S>                      <C>         <C>         <C>          <C>         <C>
1993:
  Amounts payable to
   banks (A)............ $15,224,000   60.8%(C)   $39,972,000 $18,843,000    41.0%(F)
  Commercial paper (B)..         --     --        162,500,000  54,166,000     3.2%
1992:
  Amounts payable to
   banks (A)............ $19,465,000   79.2%(C)  $ 43,255,000 $25,525,000    21.1%(F)
  Commercial paper (B)..  22,000,000    3.5%      152,000,000  43,987,000     3.7%
1991:
  Amounts payable to
   banks (A)............ $24,338,000  247.7%(C)  $ 99,117,000 $31,808,000    21.3%(F)
  Commercial paper (B)..  60,500,000    4.8%       62,500,000   6,857,000     6.0%
</TABLE>
- --------
Note A--Substantially all short-term borrowings at year end were payable to
      banks under lines of credit arrangements with no termination date and
      include bank overdrafts and short-term notes payable used by foreign
      subsidiaries for working capital requirements, and the current portion
      of long-term debt.
Note B--Excludes amounts classified as noncurrent.
Note C--The unusually large weighted average interest rate is the result of
      local borrowings by the Registrant's subsidiary in Brazil, a
      hyperinflationary country. Excluding Brazil, the weighted average
      interest rate is 8.5%, 20.1%, and 16.5% for 1993, 1992, and 1991,
      respectively.
Note D--Average borrowings were determined based on the amounts outstanding at
      each month-end for foreign borrowings and the current portion of long-
      term debt and daily or monthly amounts outstanding during the year under
      domestic lines of credit.
Note E--The weighted average interest rate during the year was computed by
      dividing actual interest expense in each year by average short-term
      borrowings outstanding during the year.
Note F--The unusually large weighted average interest rate during the year is
      the result of local borrowings by the Registrant's subsidiary in Brazil,
      a hyperinflationary country. Excluding Brazil, the weighted average
      interest rate during the year was 8.5%, 17.1%, and 17.2% for 1993, 1992,
      and 1991, respectively.
 
                                      13
<PAGE>
 
                    NALCO CHEMICAL COMPANY AND SUBSIDIARIES
 
                                --------------
 
            SCHEDULE X--SUPPLEMENTARY INCOME STATEMENT INFORMATION
 
<TABLE>
<CAPTION>
                  COL. A                                  COL. B
                  ------                    -----------------------------------
                                               CHARGED TO COSTS AND EXPENSES
                                            -----------------------------------
                                                  YEAR ENDED DECEMBER 31
                   ITEM                        1993        1992        1991
                   ----                     ----------- ----------- -----------
<S>                                         <C>         <C>         <C>
Maintenance and repairs.................... $21,943,000 $22,264,000 $22,796,000
</TABLE>
- --------
Note--Amounts for amortization of intangible assets, royalties, taxes (other
    than payroll and income taxes) and advertising costs have been omitted, as
    such amounts are less than 1% of total sales and revenues.
 
                                      14

<PAGE>
 
                                                                    EXHIBIT (11)
 
                STATEMENT RE: COMPUTATION OF EARNINGS PER SHARE
 
                    NALCO CHEMICAL COMPANY AND SUBSIDIARIES
 
<TABLE>
<CAPTION>
                                                    YEAR ENDED DECEMBER 31
                                                  ----------------------------
                                                    1993      1992      1991
(AMOUNTS IN THOUSANDS, EXCEPT PER SHARE DATA)     --------  --------  --------
<S>                                               <C>       <C>       <C>
PRIMARY
  Average shares outstanding during the year.....   69,125    70,035    69,562
  Net effect of dilutive stock options and shares
   contingently issuable--based on the treasury
   stock method using average market price.......      738       945       815
                                                  --------  --------  --------
    TOTALS.......................................   69,863    70,980    70,377
                                                  ========  ========  ========
  Earnings from continuing operations before
   extraordinary loss and effect of accounting
   change........................................ $152,697  $144,989  $134,586
  Discontinued operations, net of taxes..........      --        --      3,205
  Extraordinary loss from retirement of debt, net
   of taxes......................................  (10,600)      --        --
  Cumulative effect of change in accounting for
   postretirement benefits other than pensions,
   net of taxes..................................  (56,462)      --        --
                                                  --------  --------  --------
  Net earnings...................................   85,635   144,989   137,791
  Preferred stock dividends, net of taxes........  (10,813)   (9,988)  (10,045)
                                                  --------  --------  --------
  Net earnings to common shareholders............ $ 74,822  $135,001  $127,746
                                                  ========  ========  ========
  Per share amounts:
  Earnings from continuing operations before
   extraordinary loss and effect of accounting
   change........................................ $   2.03  $   1.90  $   1.78
  Discontinued operations, net of taxes..........      --        --        .04
  Extraordinary loss from retirement of debt, net
   of taxes......................................     (.15)      --        --
  Cumulative effect of change in accounting for
   postretirement benefits other than pensions,
   net of taxes..................................     (.81)      --        --
                                                  --------  --------  --------
  Net earnings to common shareholders............ $   1.07  $   1.90  $   1.82
                                                  ========  ========  ========
</TABLE>
<PAGE>
 
                                                                    EXHIBIT (11)
 
                STATEMENT RE: COMPUTATION OF EARNINGS PER SHARE
 
                    NALCO CHEMICAL COMPANY AND SUBSIDIARIES
 
<TABLE>
<CAPTION>
                                                    YEAR ENDED DECEMBER 31
                                                  ----------------------------
                                                    1993      1992      1991
(AMOUNTS IN THOUSANDS, EXCEPT PER SHARE DATA)     --------  --------  --------
<S>                                               <C>       <C>       <C>
FULLY DILUTED
  Average shares outstanding during the year.....   69,125    70,035    69,562
  Average dilutive effect of assumed conversion
   of ESOP Convertible Preferred Shares..........    8,190     8,253     8,290
  Additional shares assuming exercise of dilutive
   stock options and shares contingently
   issuable--based on the treasury stock method
   using the year-end market price, if higher
   than average market price.....................      812       966     1,085
                                                  --------  --------  --------
    TOTALS.......................................   78,127    79,254    78,937
                                                  ========  ========  ========
  Earnings from continuing operations before
   extraordinary loss and effect of accounting
   change........................................ $152,697  $144,989  $134,586
  Discontinued operations, net of taxes..........      --        --      3,205
  Extraordinary loss from retirement of debt, net
   of taxes......................................  (10,600)      --        --
  Cumulative effect of change in accounting for
   postretirement benefits other than pensions,
   net of taxes..................................  (56,462)      --        --
                                                  --------  --------  --------
  Net earnings...................................   85,635   144,989   137,791
  Additional ESOP contribution resulting from
   assumed conversion, net of taxes..............   (5,254)   (5,625)   (5,711)
  Tax adjustment on assumed common dividends.....     (573)    2,563     2,545
                                                  --------  --------  --------
  Net earnings applicable to common shareholders. $ 79,808  $141,927  $134,625
                                                  ========  ========  ========
  Per share amounts:
  Earnings from continuing operations before
   extraordinary loss and effect of accounting
   change........................................ $   1.88  $   1.79  $   1.67
  Discontinued operations, net of taxes..........      --        --        .04
  Extraordinary loss from retirement of debt, net
   of taxes......................................     (.14)      --        --
  Cumulative effect of change in accounting for
   postretirement benefits other than pensions,
   net of taxes..................................     (.72)      --        --
                                                  --------  --------  --------
  Net earnings to common shareholders............ $   1.02  $   1.79  $   1.71
                                                  ========  ========  ========
</TABLE>

<PAGE>
 
                       REPORT OF INDEPENDENT ACCOUNTANTS

To the Board of Directors
and Shareholders of
Nalco Chemical Company

In our opinion, the accompanying statement of consolidated financial condition
and the related consolidated statements of earnings, of cash flows and of common
shareholders' equity present fairly, in all material respects, the financial
position of Nalco Chemical Company and its subsidiaries at December 31, 1993,
and the results of their operations and their cash flows for the year in
conformity with generally accepted accounting principles. These financial
statements are the responsibility of the Company's management; our
responsibility is to express an opinion on these financial statements based on
our audit. We conducted our audit of these statements in accordance with
generally accepted auditing standards which require that we plan and perform the
audit to obtain reasonable assurance about whether the financial statements are
free of material misstatement. An audit includes examining, on a test basis,
evidence supporting the amounts and disclosures in the financial statements,
assessing the accounting principles used and significant estimates made by
management, and evaluating the overall financial statement presentation. We
believe that our audit provides a reasonable basis for the opinion expressed
above. The financial statements of Nalco Chemical Company for the years ended
December 31, 1992 and 1991 were audited by other independent accountants whose
report dated January 26, 1993 expressed an unqualified opinion on those
statements.

As discussed in the notes to the financial statements, the Company changed its
method of accounting for postretirement benefits other than pensions in 1993.


PRICE WATERHOUSE
Chicago, Illinois
January 25, 1994, except as to Note 17,
which is as of February 3, 1994

R. R. Ross
Engagement Partner

<PAGE>
 
MANAGEMENT'S DISCUSSION AND ANALYSIS--RESULTS OF OPERATIONS

Sales from continuing operations reached record levels for the seventh
consecutive year in 1993, totaling $1,389 million, a 1 percent gain over last
year. 1992 sales rose 11 percent over the 1991 total of $1,237 million; however,
the sales increase would have been 8 percent excluding sales of the five former
affiliated companies which were acquired late in the first quarter 1991. Sales
for the last three years by major operating unit were as follows:

<TABLE>
<CAPTION>
                                                            1993 vs 1992  1992 vs 1991
                                                              Increase
(in millions)                   1993      1992      1991     (Decrease)     Increase
- ------------                  --------  --------  --------  ------------  ------------
<S>                           <C>       <C>       <C>       <C>           <C>
Water and Waste Treatment     $  333.6  $  320.0  $  303.1         4%            6%
Process Chemicals                347.1     324.7     285.9         7            14  
Petroleum Chemicals              136.1     141.9     138.6        (4)            2
International*                   572.6     587.9     509.7        (3)           15
                              --------  --------  --------
Total                         $1,389.4  $1,374.5  $1,237.3         1            11
 *Includes export sales of        32.2      28.0      31.6
 </TABLE>

Sales by the three units comprising U.S. Operations were up 4 percent in 1993,
as six of the twelve marketing groups reported improved results. The Water and
Waste Treatment Division posted a 4 percent increase, with four of the five
marketing groups recording solid advances, including a double-digit gain by
UNISOLV. Strong double-digit gains by Absorbent Chemicals and the Pulp and Paper
Chemicals Group paced the Process Chemicals Division to a 7 percent increase
over 1992. Petroleum Chemicals Division sales were down 4 percent from a year
ago, because of lower oil field production sales. International Operations
reported a 3 percent sales decline. Sales by European subsidiaries were down 9
percent, primarily as a result of the stronger U.S. dollar in relation to
European currencies. Sales in Europe would have increased 6 percent had 1993
exchange rates remained the same as 1992. Sales by Latin American subsidiaries
were 9 percent higher than a year ago as our companies in Venezuela, Chile, and
Argentina reported double-digit advances. In the Pacific Rim, double-digit sales
gains by subsidiaries in Indonesia, Japan, and South East Asia resulted in an 8

<PAGE>
 
percent increase over 1992. Had translation rates remained unchanged from 1992,
revenues of our Pacific Rim companies would have risen 13 percent.

U.S. Operations posted an 8 percent sales advance in 1992 compared with 1991, as
most marketing groups reported improved results. International Operations
revenues were up 15 percent. The 1991 acquisition of former affiliated companies
contributed about half of the increase because these operations reported 9
months sales in 1991 compared to the full year in 1992. Sales by European
subsidiaries rose 12 percent, primarily as a result of the aforementioned
acquisition and the weaker U.S. dollar in relation to European currencies. Sales
by Latin American subsidiaries increased 13 percent principally because of
double-digit gains by our companies in Brazil, Colombia, and Argentina. In the
Pacific Rim, results of the acquired companies and double-digit sales gains by
most of the other subsidiaries in the region resulted in a 39 percent increase
over 1991.

Cost of products sold was 43.8 percent of sales for 1993, compared with
percentages of 44.5 for 1992 and 45.0 for 1991. U.S. Operations reported
slightly higher selling prices and declining raw material costs which more than
offset increased manufacturing expenses. Gross margins of our foreign
subsidiaries were also slightly higher than a year ago.

Stable selling prices and declining raw material costs, partly offset by higher
manufacturing expenses, accounted for higher gross margins reported by U.S.
Operations in 1992 over 1991. Gross margins of our foreign subsidiaries also
increased from 1991 with our subsidiaries in Australia, Brazil, and Colombia
reporting the most significant improvements.

Operating expenses increased $15 million, or 3 percent in 1993. Selling and
service expenses were up $13 million, or 3 percent over last year. Salaries,
benefits, and commissions rose $10 million, or 4 percent, reflecting growth in
the sales force and the adoption of new accounting rules for retiree benefits
other than pensions.

Worldwide, research expenses rose $2 million, or 5 percent over 1992, mainly due
to higher salaries and benefits. As a percent to sales, research 
<PAGE>
 
expenses were 3.6 percent in 1993 compared to 3.5 percent in 1992 and 3.7
percent in 1991.

Administrative expenses for 1993 declined slightly from last year. Lower
provisions for incentive plans were partly offset by increased salaries and
benefits.

Total operating expenses for 1992 were up $49 million, or 11 percent over 1991
in part because 1992 included a full year of expenses for the acquired companies
compared to nine months in 1991. Higher salaries, benefits, and commissions,
associated with the growth of the sales force, also contributed to this
increase.

Interest and other income for 1993 was $14 million, a $4 million decline from a
year ago. This decrease was primarily the result of lower interest income which
resulted from reduced levels of invested cash balances and lower interest rates.
A $2 million gain on the sale of an investment in a mutual insurance company and
a $1 million improvement in equity in earnings of affiliated companies partially
offset the reduction in interest income. Interest and other income for 1991
included $3 million of equity earnings of the five affiliated companies that
were purchased that year.

Interest expense totaled $28 million in 1993, a decrease of $12 million from a
year ago, which reflects the early repayment of debt discussed below. 1992
interest expense of $40 million was up $13 million over 1991 due to larger
outstanding debt to support the affiliate acquisitions made in 1991.

Earnings from continuing operations before extraordinary loss and effect of
accounting change as a percent to sales were 11.0 percent, 10.5 percent, and
10.9 percent in 1993, 1992, and 1991, respectively.

During the first quarter 1993, the Company recorded an extraordinary loss of $11
million as a result of the early repayment of long-term debt. (See Note 13).

Effective January 1, 1993, the Company implemented, on the immediate recognition
basis, Statement of Financial Accounting Standards No. 106 (SFAS 106),
"Employers' Accounting for Postretirement Benefits Other Than 
<PAGE>
 
Pensions." The adoption of SFAS 106 resulted in a non-recurring charge to 1993
earnings of $57 million, net of $33 million of income tax benefits. (See Note
4). In addition, operating earnings for 1993 were reduced $8 million due to the
recurring additional costs related to SFAS 106.

Also effective January 1, 1993, the Company adopted Statement of Financial
Accounting Standards No. 109 (SFAS 109), "Accounting for Income Taxes", and
Statement of Financial Accounting Standards No. 112 (SFAS 112), "Employers'
Accounting for Postemployment Benefits." Adoption of these pronouncements did
not have a material effect on the Company's earnings or financial position.

On August 10, 1993, the Revenue Reconciliation Act of 1993 was signed into law,
which increased the U.S. corporate income tax rate from 34 percent to 35
percent, retroactive to January 1, 1993. Without this tax rate change, the 1993
effective tax rate would have been 38.1 percent, compared with the actual
effective tax rate of 38.9 percent.

The Company is involved in environmental clean-up activities or litigation in
connection with former waste disposal sites and plant locations. (See Note 15).
This involvement has not had, nor is it expected to have, a material effect on
the Company's earnings or financial position.
<PAGE>
 
MANAGEMENT'S DISCUSSION AND ANALYSIS--FINANCIAL CONDITION

Total assets decreased $138 million or 10 percent during 1993. A $143 million
decline in cash, cash equivalents, and short-term marketable securities reflects
repayment of commercial paper borrowings.

Inventories were $6 million or 8 percent lower than at the end of 1992, and $18
million lower than the December 31, 1991 level. The Company is committed to a
program of improved inventory management which complements high levels of
customer service.

The $25 million increase in net property, plant, and equipment reflects capital
spending of $118 million and depreciation expense of $83 million. The
translation impact of a stronger U.S. dollar reduced the carrying value of the
fixed assets of foreign subsidiaries.

Liabilities dropped $113 million or 15 percent, primarily because of the
repayment of debt. Short-term debt and long-term debt were down $26 million and
$162 million, respectively, from last year. The cumulative effect of adopting
SFAS No. 106, net of tax benefits, however, added about $60 million in
liabilities.

Current income taxes payable totaled $17 million at the end of 1993, an increase
of $11 million from a year ago, which was mainly the result of higher taxes
currently payable on United States earnings.

Deferred income taxes declined $49 million, primarily because of a $33 million
deferred tax asset associated with the provision for the cumulative effect of
adopting SFAS 106, and a $6 million deferred tax asset recorded as a result of
the extraordinary loss from the early retirement of debt.
<PAGE>
 
Shareholders' equity declined $25 million or 4 percent during 1993 primarily
because dividends totaling $72 million and common stock repurchases of 1.7
million shares for $59 million were greater than net earnings of $86 million.
Treasury stock transactions for stock option, benefit, and other plans totaled
$15 million.

Based on earnings before the extraordinary loss and the effect of the change in
accounting principle, Nalco's return on average shareholders' equity was 28.6
percent in 1993, up from 25.7 percent in 1992.

On February 3, 1994, Nalco and Exxon Chemical Company, a division of Exxon
Corporation, announced that they had signed a memorandum of understanding to
form a worldwide energy chemicals joint venture. The joint venture will include
Nalco's U.S. Petroleum Chemicals Division business units, certain petroleum
chemical product lines of its international operations, and Exxon Chemical
Company's Energy Chemicals worldwide business. (See Note 17).

On the same date, the Company announced that it had entered into a letter of
intent to sell its Freeport, Texas plant and its automotive paint spray booth
business to PPG Industries, Inc. (See Note 17).
<PAGE>
 
MANAGEMENT'S DISCUSSION AND ANALYSIS--CASH FLOWS

One of Nalco's most significant financial strengths is its ability to
consistently generate strong cash flow from operations. Net cash provided by
operating activities continued to grow in 1993, primarily from growth in net
earnings before noncash charges for the extraordinary loss from retirement of
debt, the effect of the change in accounting principle, depreciation, and
amortization.

Cash flow activity in 1993 reflected strong cash flows from operating activities
of $256 million and net proceeds of $104 million from the liquidation of
marketable securities. Major funding needs included capital spending of $118
million, payments of long-term debt of $169 million, dividends of $72
million, and $59 million for the reacquisition of common stock.

In 1992, cash from operations rose $9 million or 5 percent over the 1991 total
of $199 million, which was mainly attributable to higher net earnings.

Net cash provided by investing activities during 1993 was negligible.
Investments in property, plant, and equipment of $118 million were offset by the
cash proceeds received from the liquidation of marketable securities and the
sale of Adco Products, Inc. Domestic investments accounted for about two-thirds
of the capital spending for 1993, including $18 million for PORTA-FEED units,
$17 million for field equipment, and $18 million for transportation equipment.
The largest foreign expenditure for 1993 was $11  million for the construction
of the Nalco Europe Business and Technical Center near Leiden, The Netherlands,
which is scheduled for completion in mid-1994. In 1994 we plan to invest in
internal growth and expect capital investment to remain near the 1993 level.

In 1992, net cash required for investing activities was $124 million, with
capital spending representing the most significant activity. Domestic
investments represented 70 percent of the total capital investment of $131
million. The most significant investments included $26 million for PORTA-FEED
units, $17 million for field equipment, $26 million for transportation
equipment, and $6 million for the initial costs of constructing the Nalco Europe
Business and Technical Center.
<PAGE>
 
Investing activities required the use of $238 million in 1991, and the three
most significant business investment activities were for acquisitions, capital
investment, and the sale of a discontinued operation. The remaining 51 percent
of the common shares of five affiliated companies was acquired for $171 million;
investments in property, plant, and equipment of $137 million accounted for the
next largest investing activity; and the Company sold Day-Glo Color Corp. in a
transaction which provided $72 million.

The most significant financing activity in 1993 was the repayment of  commercial
paper borrowings as previously discussed. Dividends on common stock paid by
Nalco during 1993 amounted to $61 million or $.885 per share. Since the
Company's founding in 1928, it has paid 262 consecutive quarterly dividends, and
expects to continue its policy of paying regular cash dividends. During the
year, 1.7 million shares of common stock were repurchased at a cost of $59
million. Management believes that the stock repurchase program represents a
sound economic investment for Nalco's shareholders.

Cash dividends represented the most significant financing cash outflows in 1992
and 1991. In 1991, proceeds from debt were principally used to finance the
acquisition of the five affiliated companies.

Management expects that growth in existing businesses will be financed
principally from internally generated funds. For general purposes and to support
the ESOP loans and the issuance of commercial paper, Nalco also has a $340
million Revolving Credit Agreement with twelve banks. The credit arrangements
were unused at December 31, 1993. (See Note 13). In addition, most foreign
subsidiaries have established short-term borrowing facilities in local currency
and use them as the need arises. Net debt (short-term and long-term borrowings
less cash and short-term marketable securities) totaled $189 million, $234
million, and $255 million at December 31, 1993, 1992, and 1991, respectively.
<PAGE>

- -------------------------------------------------------------------------- 
STATEMENTS OF CONSOLIDATED EARNINGS

<TABLE>
<CAPTION>
                                                     December 31
- -------------------------------------------------------------------------- 
(in millions except per share figures)        1993       1992       1991
- -------------------------------------------------------------------------- 
<S>                                         <C>        <C>        <C>

NET SALES                                   $1,389.4   $1,374.5   $1,237.3
Operating costs and expenses
 Cost of products sold                         608.9      611.5      557.0
 Selling and service                           414.3      401.4      360.4
 Research and development                       50.4       48.0       45.9
 Administrative and general                     52.9       53.3       47.0
                                            --------   --------   --------
                                             1,126.5    1,114.2    1,010.3
                                            --------   --------   --------
OPERATING EARNINGS                             262.9      260.3      227.0
Interest and other income                       14.4       18.3       18.9
Interest expense                               (27.5)     (40.3)     (27.1)
                                            --------   --------   --------
EARNINGS FROM CONTINUING
 OPERATIONS BEFORE INCOME TAXES                249.8      238.3      218.8
Income taxes                                    97.1       93.3       84.2
                                            --------   --------   --------
EARNINGS FROM CONTINUING OPERATIONS
 BEFORE EXTRAORDINARY LOSS AND
 EFFECT OF ACCOUNTING CHANGE                   152.7      145.0      134.6
Discontinued operations, net of taxes              -          -        3.2
                                            --------   --------   --------
EARNINGS BEFORE EXTRAORDINARY LOSS
 AND EFFECT OF ACCOUNTING CHANGE               152.7      145.0      137.8
Extraordinary loss from retirement
 of debt, net of taxes                         (10.6)         -          -
Cumulative effect of change in
 accounting for postretirement
 benefits other than pensions,
 net of taxes                                  (56.5)         -          -
                                            --------   --------   --------
Net Earnings                                $   85.6   $  145.0   $  137.8
                                            ========   ========   ========
 
EARNINGS PER COMMON SHARE--PRIMARY
 Continuing operations                      $   2.03   $   1.90   $   1.78
 Discontinued operations                           -          -        .04
 Extraordinary loss from retirement
  of debt, net of taxes                         (.15)         -          -
 Cumulative effect of change in
  accounting for postretirement
  benefits other than pensions,
  net of taxes                                  (.81)         -          -
                                            --------   --------   --------
 Net earnings                               $   1.07   $   1.90   $   1.82
                                            ========   ========   ========
EARNINGS PER COMMON SHARE--FULLY DILUTED
 Continuing operations                      $   1.88   $   1.79   $   1.67
 Discontinued operations                           -          -        .04
 Extraordinary loss from retirement
  of debt, net of taxes                         (.14)         -          -
 Cumulative effect of change in
  accounting for postretirement
  benefits other than pensions,
  net of taxes                                  (.72)         -          -
                                            --------   --------   --------
 Net earnings                               $   1.02   $   1.79   $   1.71
                                            ========   ========   ========
</TABLE>

The notes to consolidated financial statements are an integral part of these
statements.

<PAGE>
 
<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------
STATEMENTS OF CONSOLIDATED FINANCIAL CONDITION
                                                            December 31
                                                  ------------------------------
(in millions)                                         1993       1992       1991
- --------------------------------------------------------------------------------
<S>                                              <C>        <C>        <C>
ASSETS                                         
CURRENT ASSETS                                 
Cash and cash equivalents                        $   78.1   $  117.5   $  120.1
Short-term marketable securities--             
 at cost which approximates market                      -      104.0       92.2
Receivables, less allowances of $4.5 in 1993,  
 $5.9 in 1992, and $4.8 in 1991                     215.2      213.3      208.3
Inventories                                    
 Finished products                                   43.5       44.7       52.9
 Materials and work in process                       25.4       30.0       34.4
                                                 --------   --------   --------
                                                     68.9       74.7       87.3
Prepaid expenses                                     12.8       12.4       10.0
                                                 --------   --------   --------
TOTAL CURRENT ASSETS                                375.0      521.9      517.9
Other Assets                                   
Net assets of discontinued operations                   -       14.1       26.4
Goodwill, less accumulated amortization        
 of $10.1 in 1993, $6.7 in 1992,               
 and $3.6 in 1991                                   112.9      118.2      138.3
Miscellaneous                                       166.0      163.1      148.2
                                                 --------   --------   --------
TOTAL OTHER ASSETS                                  278.9      295.4      312.9
NET PROPERTY, PLANT, AND EQUIPMENT                  558.5      533.3      493.6
                                                 --------   --------   --------
TOTAL ASSETS                                     $1,212.4   $1,350.6   $1,324.4
                                                 ========   ========   ========
                                               
                                               
                                               
LIABILITIES AND SHAREHOLDERS' EQUITY           
CURRENT LIABILITIES                            
Short-term debt                                  $   15.2   $   41.5   $   84.9
Accounts payable                                     84.5       89.4       98.0
Accrued compensation                                 26.3       28.4       28.5
Other accrued expenses                               46.2       41.8       43.5
Income taxes                                         17.4        6.5        6.7
                                                 --------   --------   --------
TOTAL CURRENT LIABILITIES                           189.6      207.6      261.6
LONG-TERM DEBT                                      252.1      413.8      394.1
DEFERRED INCOME TAXES                                58.1      107.3       90.8
ACCRUED POSTRETIREMENT BENEFITS                      94.2          -          -
OTHER LIABILITIES                                    67.8       45.6       49.2
COMMITMENTS AND CONTINGENT LIABILITIES                  -          -          -
                                               
SHAREHOLDERS' EQUITY                           
Preferred stock--par value $1.00 per share            0.4        0.4        0.4
 Capital in excess of par value of shares           195.7      197.3      198.7
 Unearned ESOP compensation                        (174.4)    (188.7)    (189.6)
                                                 --------   --------   --------
                                                     21.7        9.0        9.5
Common stock--par value $.1875 per share;      
 80,287,568 shares issued                            15.1       15.1       15.1
 Capital in excess of par value of shares            10.6        9.6        8.7
Retained earnings                                   819.2      807.6      731.4
Minimum pension liability adjustment                 (7.1)         -          -
Foreign currency translation adjustments            (49.3)     (50.4)     (23.9)
Common stock reacquired--at cost                   (259.6)    (214.6)    (212.1)
                                                 --------   --------   --------
TOTAL SHAREHOLDERS' EQUITY                          550.6      576.3      528.7
                                                 --------   --------   --------
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY       $1,212.4   $1,350.6   $1,324.4
                                                 ========   ========   ========
</TABLE>

The notes to consolidated financial statements are an integral part of these
statements .


<PAGE>
 
<TABLE>
<CAPTION>
 
STATEMENTS OF CONSOLIDATED CASH FLOWS
                                                          December 31
                                                   -------------------------
(in millions)                                         1993     1992     1991
- -------------------------------------------------- -------  -------  -------
<S>                                                <C>      <C>      <C>
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES
Net earnings                                       $  85.6  $ 145.0  $ 137.8
Adjustments to reconcile net earnings to
 cash provided by operating activities
 Extraordinary loss from retirement
  of debt                                             10.6        -        -
 Cumulative effect of change in accounting for
  postretirement benefits other than pensions         56.5        -        -
 Depreciation and amortization                        86.5     80.6     69.1
 Noncurrent deferred income taxes                     (2.8)    17.2     13.4
 Other--net                                           10.4    (15.7)     1.4
 Changes in current assets and liabilities
  Receivables                                        (31.6)   (24.2)   (16.7)
  Inventories                                         (4.4)     3.4     (9.5)
  Accounts payable                                    15.4      2.0      1.7
  Other                                               29.7        -      1.9
                                                   -------  -------  -------
NET CASH PROVIDED BY OPERATING ACTIVITIES            255.9    208.3    199.1
                                                   -------  -------  -------
CASH PROVIDED BY (USED FOR) INVESTING ACTIVITIES
Additions to property, plant, and equipment         (117.8)  (131.0)  (136.8)
Business purchase                                        -        -   (170.9)
Purchases of marketable securities and
 restricted investments                             (210.2)  (228.9)  (222.6)
Sales of marketable securities and
 restricted investments                              314.2    228.9    222.3
Proceeds from sale of business                        15.7      7.5     71.9
Other investing activities                            (1.4)    (0.4)    (1.6)
                                                   -------  -------  -------
NET CASH PROVIDED BY (USED FOR)
 INVESTING ACTIVITIES                                  0.5   (123.9)  (237.7)
                                                   -------  -------  -------
CASH PROVIDED BY (USED FOR) FINANCING ACTIVITIES
Cash dividends, net of taxes                         (71.9)   (68.8)   (67.8)
Proceeds from long-term debt                           1.3     32.9    179.0
Payments of long-term debt                          (168.7)   (46.3)    (6.1)
Common stock reacquired                              (58.5)   (14.3)       -
Other financing transactions                           2.2      9.7     21.2
                                                   -------  -------  -------
NET CASH PROVIDED BY (USED FOR)
 FINANCING ACTIVITIES                               (295.6)   (86.8)   126.3
Effect of foreign exchange rate changes
 on cash and cash equivalents                         (0.2)    (0.2)    (2.8)
                                                   -------  -------  -------
Increase (decrease) in cash
 and cash equivalents                                (39.4)    (2.6)    84.9
Cash and cash equivalents at the
 beginning of the year                               117.5    120.1     35.2
                                                   -------  -------  -------
CASH AND CASH EQUIVALENTS
 AT THE END OF THE YEAR                            $  78.1  $ 117.5  $ 120.1
                                                   =======  =======  =======
</TABLE>

The notes to consolidated financial statements are an integral part of these
statements.


<PAGE>
 
<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------------------------
STATEMENT OF CONSOLIDATED COMMON SHAREHOLDERS' EQUITY

(in millions)
- ----------------------------------------------------------------------------------------------------------------------
                                                Capital in              Minimum      Foreign         Common Stock
                                        Common  Excess of               Pension      Currency         Reacquired
                                        Stock   Par Value   Retained   Liability    Translation      Number
                                        Issued  of Shares   Earnings   Adjustment   Adjustments    of Shares    Cost
- ----------------------------------------------------------------------------------------------------------------------
<S>                                     <C>     <C>         <C>        <C>          <C>           <C>          <C>
BALANCE AT JANUARY 1, 1991               $15.1    $ 7.9      $660.2        $   -       $(13.0)        11.0     $(222.3)
 
Net earnings                                                  137.8
Earnings of acquired companies                                  1.2
Dividends on preferred stock
 --net of tax                                                 (10.0)
Dividends on common stock
 ($0.83 per share)                                            (57.8)
Stock issued under option,
 benefit, and other plans                           0.8                                               (0.5)      10.2
Currency translation adjustments                                                        (10.9)
                                         -----    -----      ------        -----       ------          ----   -------
BALANCE AT DECEMBER 31,1991               15.1      8.7       731.4            -        (23.9)        10.5     (212.1)
 
Net earnings                                                  145.0
Dividends on preferred stock
 --net of tax                                                 (10.0)
Dividends on common stock
 ($0.84 per share)                                            (58.8)
Reacquired common stock                                                                                 0.4     (14.3)
Stock issued under option,
 benefit, and other plans                           0.9                                                (0.6)     11.8
Currency translation adjustments                                                        (26.5)
                                         -----    -----      ------        -----       ------          ----   -------
BALANCE AT DECEMBER 31, 1992              15.1      9.6       807.6            -        (50.4)         10.3    (214.6)
 
Net earnings                                                   85.6
Net loss by foreign
 subsidiaries in December 1992                                 (2.1)
Dividends on preferred stock
 --net of tax                                                 (10.8)
Dividends on common stock
 ($0.885 per share)                                           (61.1)
Reacquired common stock                                                                                 1.7     (58.5)
Stock issued under option,
 benefit, and other plans                           1.0                                                (0.6)     13.5
Minimum pension liability adjustment                                        (7.1)
Currency translation adjustments                                                          1.1
                                         -----    -----      ------        -----       ------          ----   -------
BALANCE AT DECEMBER 31, 1993             $15.1    $10.6      $819.2        $(7.1)      $(49.3)         11.4   $(259.6)
                                         =====    =====      ======        =====       ======          ====   =======
</TABLE>

The notes to consolidated financial statements are an integral part of these
statements.
<PAGE>
 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

NOTE 1--SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

CONSOLIDATION POLICY--Nalco's consolidated financial statements include the
accounts of the parent company and its majority-owned subsidiaries. In 1993, the
fiscal year end of the consolidated foreign subsidiaries was changed from
November 30 to December 31. As a result of the change, the Company recorded the
results of its foreign operations for the month of December 1992 directly to
retained earnings. Investments in affiliated companies are reported on the
equity method.

CONCENTRATION OF CREDIT RISK--Financial instruments which potentially subject
the Company to concentration of credit risk consist principally of cash and cash
equivalents, short-term marketable securities, and receivables.

Nalco has a formal policy to place cash and cash equivalents with high credit
quality financial institutions and limit the amount of credit exposure to any
one financial institution. Cash and cash equivalents include demand deposits and
short-term highly liquid debt instruments purchased with maturities of three
months or less. Management believes the likelihood of incurring losses related
to credit risk is remote.

Concentration of credit risk relating to receivables is limited due to a large
number of customers from many different industries and locations. Management
believes the recorded allowances for doubtful accounts are adequate to cover
potential credit risk losses.

FOREIGN CURRENCY TRANSLATION--The local currency has been designated as the
functional currency in financial statements of companies which account for
approximately 86 percent of total foreign subsidiary net assets at the end of
1993. These financial statements are translated at current and average exchange
rates, with any resulting translation adjustments included in the cumulative
translation adjustment account in shareholders' equity. The remaining
subsidiaries operate in countries with hyperinflationary environments and their
statements are translated using a combination of current, average, and
historical exchange rates, with the resulting translation impact included in
results of operations. Transactions executed in different currencies resulting
in exchange adjustments are included in results of operations. The impact of
foreign currency exchange transactions, included in interest and other income in
1993, 1992, and 1991, was not 
<PAGE>
 
significant.

FOREIGN CURRENCY EXCHANGE CONTRACTS--Nalco, in the management of its exposure to
fluctuations in foreign currency rates, enters into forward exchange contracts
and currency swaps. The forward contracts hedge foreign currency transactions
and have maturities which generally do not exceed six months. The Company's swap
agreements have maturities up to 7 years, and hedge foreign currency
intercompany loans related to the 1991 affiliate acquisitions. Counterparties
are major financial institutions. Nalco is exposed to credit loss in the event
of non-performance by the counterparties to the contracts. However, management
evaluates the creditworthiness of the counterparties' financial condition and
believes the likelihood of such default is remote and any losses therefrom would
not be material. At December 31, 1993, the Company had approximately $27 million
in foreign forward exchange contracts and $130 million in foreign currency
swaps.

INVENTORY VALUATION--Inventories are valued at the lower of cost or market.
Approximately 59 percent of the inventories at the end of 1993 are valued using
the last-in, first-out (LIFO) method. The remaining inventories are valued using
the average cost or first-in, first-out (FIFO) method. If the FIFO method of
accounting had been used for all inventories, reported inventory amounts would
have been higher at December 31, 1993, 1992, and 1991 by $35 million, $41
million, and $44 million, respectively.

During 1993 and 1992, inventory quantities were reduced, which resulted in a
liquidation of LIFO inventory layers carried at lower costs which prevailed in
prior years. The effect of these liquidations was not material.

GOODWILL--Goodwill consists of costs in excess of the fair value of tangible net
assets of acquired companies and is generally amortized over 40 years using the
straight-line method. The Company periodically makes judgmental determinations
of the value of the recorded goodwill to determine if an impairment has
occurred. Management is currently of the opinion that no such impairment exists.

INCOME TAXES--In 1992 and 1991, the provision for deferred income taxes
represents the tax effect of differences in the timing of income and expense
recognition for tax and financial reporting purposes. The provision for deferred
income taxes in 1993 was determined pursuant to the provisions of Statement of
Financial Accounting Standards No. 109 (SFAS 109), "Accounting for Income
Taxes". Under this statement, the provision for deferred income taxes represents
the tax effect of temporary differences between the carrying 
<PAGE>
 
amount of assets and liabilities and their tax bases.

Deferred income taxes are provided on the undistributed earnings of foreign
subsidiaries and affiliated companies except to the extent such earnings are
considered to be permanently reinvested in the subsidiary or affiliate. Where it
is contemplated that earnings will be remitted, credit for foreign taxes already
paid generally will offset applicable U.S. income taxes. In cases where foreign
tax credits will not offset U.S. income taxes, appropriate provisions are
included in the Consolidated Statements of Earnings. Repatriation of permanently
reinvested earnings would not materially increase the Company's tax liabilities.

RETIREMENT PLANS--The cost of retirement plans is computed on the basis of
accepted actuarial methods (using the projected unit credit method for the
principal plan) and includes current service costs, amortization of increases in
prior service costs over the expected future service of active participants as
of the date such costs are first recognized, and amortization of the initial
unrecognized net pension asset or liability on a straight-line basis over 18
years.

The costs of health and life insurance postretirement benefits were charged
against earnings as paid in years prior to 1993. Effective January 1, 1993, the
Company adopted SFAS 106, "Employers' Accounting for Postretirement Benefits
Other Than Pensions", and the costs of providing such benefits are accrued as
earned. Annual expense represents a combination of interest and service cost
provisions. Most postretirement benefits are not funded.

EMPLOYEE STOCK OWNERSHIP PLAN (ESOP)--ESOP contribution expense is based upon
non-level debt payments made by the ESOP to meet the plan funding requirements.
An adjustment to expense is made when the computed amount is less than 80
percent of the cumulative expense that would be recognized under the "shares
allocated" method.

EARNINGS PER SHARE--Primary earnings per common share is computed by dividing
net earnings (after deducting preferred stock dividends, net of income taxes) by
the weighted average number of shares and share equivalents outstanding during
the year. Fully diluted earnings per share is based upon the weighted average
number of common shares and share equivalents, plus the weighted average number
of common shares resulting from the assumed conversion of the Series B ESOP
Convertible Preferred Stock (preferred stock). Earnings for purposes of
computing fully diluted earnings per share are reduced for additional ESOP debt
service expense resulting from the assumed replacement of preferred stock
dividends with common stock dividends, net of related tax benefits.
<PAGE>
 
NOTE 2--BUSINESS SEGMENT AND GEOGRAPHIC AREA DATA

Nalco is engaged in the worldwide manufacture and sale of highly specialized
Service Chemical programs. This includes production and service related to the
sale and application of chemicals and technology used in water treatment,
pollution control, energy conservation, oil production and refining,
steelmaking, papermaking, mining, and other industrial processes as well as a
superabsorbent product for the disposable diaper market.

Within Nalco, sales between geographic areas are made at prevailing market
prices to customers minus an amount intended to compensate the sister Nalco
company for providing quality customer service.

Operating earnings represent sales less cost of products sold and operating
expenses. In computing operating earnings, none of the following items is
considered: general corporate expenses, interest income or expense, equity in
earnings of affiliated companies, or income taxes.

Identifiable assets are those directly associated with operations of the
geographic area. Corporate assets consist mainly of cash and cash equivalents,
marketable securities, investments in unconsolidated affiliates and leveraged
leases, and capital assets used for corporate purposes. Corporate assets for the
years 1992 and 1991 also include the net assets of discontinued operations.
<PAGE>
 
GEOGRAPHIC AREA DATA

<TABLE>
<CAPTION>
 
(in millions)                        1993        1992        1991
- ----------------------------------------------------------------- 
<S>                                <C>        <C>        <C>                                                                        
SALES                                                                                                                            
North America                      $  915.1   $  883.7   $  815.8                                                                
Europe                                315.6      346.5      310.6                                                                
Latin America                          66.4       60.7       53.9                                                                
Pacific                               116.7      108.2       77.7                                                                
Sales between areas                   (24.4)     (24.6)     (20.7)                                                                
                                   --------   --------   --------                                                                
                                   $1,389.4   $1,374.5   $1,237.3                                                                
                                   ========   ========   ========                                                                
OPERATING EARNINGS                                                                                                               
North America                      $  216.9   $  211.3   $  186.7                                                                
Europe                                 41.8       48.9       44.0                                                                
Latin America                          11.4       10.0        5.6                                                                
Pacific                                14.4       14.4        8.2                                                                
Expenses not allocated to areas       (21.6)     (24.3)     (17.5)                                                                
                                   --------   --------   --------                                                                
                                   $  262.9   $  260.3   $  227.0                                                                
                                   ========   ========   ========                                                                
IDENTIFIABLE ASSETS                                                                                                              
North America                      $  566.6   $  562.2   $  542.0                                                                
Europe                                227.4      225.5      240.7                                                                
Latin America                          45.4       42.7       40.1                                                                
Pacific                               126.3      124.7      128.9                                                                
Corporate                             246.7      395.5      372.7                                                                
                                   --------   --------   --------                                                                
                                   $1,212.4   $1,350.6   $1,324.4                                                                
                                   ========   ========   ========                                                                 
</TABLE> 
 
Amounts for United States sales in the tabulation above include exports to the
following areas:
 
<TABLE> 
<CAPTION> 

(in millions)                              1993    1992    1991                                                                   
- ----------------------------------------------------------------
<S>                                        <C>     <C>     <C> 
Latin America                              $19.2   $16.0   $18.8                                                                 
All other                                   13.0    12.0    12.8                                                                 
- ----------------------------------------------------------------
</TABLE>

<PAGE>
 
NOTE 3--PENSION PLANS

The Company has several noncontributory defined benefit pension plans covering
most employees in the United States and those with eight foreign subsidiaries.
The principal domestic plan represents approximately 73 percent of the projected
benefit obligation and 82 percent of the total market value of assets. This plan
provides benefits that are based on years of service and the employee's highest
paid 48 months during the last 120 months before termination of employment.
Approximately 94 percent of the assets in the plan at December 31, 1993 was
invested in stocks, bonds, and insurance contracts, and the remaining assets
were invested in professionally managed real estate trusts and partnerships. Due
to the present funded position of the plan, no contributions have been made
since 1984, and none are anticipated in 1994. Four of the eight foreign pension
plans are unfunded, generally because amounts contributed are not deductible for
tax purposes.

Employees in the United States whose pension benefits exceed ERISA limitations
are covered by a supplementary non-qualified, unfunded pension plan which is
being provided for by charges to earnings sufficient to meet the projected
benefit obligation (PBO). The accruals for the cost of this plan are based on
substantially the same actuarial methods and economic assumptions as those used
for the principal plan.

Net pension expense for all defined benefit plans included in operating results
was comprised of:

<TABLE>
<CAPTION>
 
(in millions)                                     1993    1992     1991
- ------------------------------------------------------------------------
<S>                                             <C>      <C>      <C>
Service cost for benefits earned                $ 16.4   $ 15.9   $ 12.9
Interest costs on the PBO                         23.1     24.5     20.7
Actual return on plan assets                     (41.7)   (22.5)   (42.1)
Net amortizations and deferrals                   17.1     (4.3)    17.0
                                                ------   ------   ------
Net pension expense for defined benefit plans   $ 14.9   $ 13.6   $  8.5
                                                ======   ======   ======
</TABLE>

<PAGE>
 
Assumptions for the plans as of the end of the last three years were as follows:

<TABLE>
<CAPTION>
                                                      U.S. Plans
                                            -----------------------------
                                              1993      1992       1991
- -------------------------------------------------------------------------
<S>                                         <C>       <C>          <C>
Weighted-average discount rates                 7.5%       8.5%       8.3%
Rates of increase in compensation levels        4.8        6.3        7.0
Rates of return on plan assets                  9.0       10.0       10.0
- -------------------------------------------------------------------------

                                                     Foreign Plans
                                            -----------------------------
                                              1993      1992       1991
- -------------------------------------------------------------------------
Weighted-average discount rates             6.5-9.0%  7.0-10.0%  6.5-11.0%
Rates of increase in compensation levels    4.5-6.5   5.0- 8.0   5.0- 8.0
Rates of return on plan assets              7.0-9.5   7.0-10.0   6.5-10.0
- -------------------------------------------------------------------------
</TABLE>

The following table sets forth the funded status and amounts recognized in the
consolidated statements of financial condition at year end for plans in which
assets exceed the accumulated benefit obligation (ABO):

<TABLE>
<CAPTION>
 
                                             December 31
                                      ------------------------
(in millions)                          1993     1992     1991
- --------------------------------------------------------------
<S>                                   <C>      <C>      <C>
Actuarial present value of:
 Vested benefit obligation            $178.1   $150.4   $160.5
 Non-vested benefit obligation           3.4      5.6      5.4
                                      ------   ------   ------
 Total ABO                             181.5    156.0    165.9
 Effect of future salary increases      90.9     79.2     80.1
                                      ------   ------   ------
 Total PBO                             272.4    235.2    246.0
Plan assets at fair market value       278.2    247.8    266.9
                                      ------   ------   ------
Plan assets in excess of the PBO         5.8     12.6     20.9
Unrecognized net (asset)
 from date of adoption                 (32.0)   (34.7)   (38.0)
Unrecognized prior service cost         15.4     15.4      9.9
Unrecognized net actuarial losses       21.8     22.6     24.7
                                      ------   ------   ------
Net pension assets recognized         $ 11.0   $ 15.9   $ 17.5
                                      ======   ======   ======
</TABLE>

<PAGE>
 
The following table sets forth the funded status and amounts recognized in the
consolidated statements of financial condition at year end for plans in which
the ABO exceeds assets:

<TABLE>
<CAPTION>
 
                                                    December 31
                                             ------------------------
(in millions)                                 1993     1992     1991
- ---------------------------------------------------------------------
<S>                                          <C>      <C>      <C>
Actuarial present value of:
 Vested benefit obligation                   $ 25.9   $ 24.7   $ 22.8
 Non-vested benefit obligation                  2.2      1.9      1.6
                                             ------   ------   ------
 Total ABO                                     28.1     26.6     24.4
 Effect of future salary increases             13.2     14.9     15.2
                                             ------   ------   ------
 Total PBO                                     41.3     41.5     39.6
Plan assets at fair market value                3.4      3.3        -
                                             ------   ------   ------
Plan assets (less) than the PBO               (37.9)   (38.2)   (39.6)
Unrecognized net liability
  from date of adoption                         4.1      4.6      4.3
Unrecognized prior service cost                 7.5      8.9      1.2
Unrecognized net actuarial losses              15.9     17.8     11.4
Adjustment to recognize minimum liability     (20.5)   (10.0)    (6.0)
                                             ------   ------   ------
Net pension (liabilities) recognized         $(30.9)  $(16.9)  $(28.7)
                                             ======   ======   ======
</TABLE>

In accordance with Statement of Financial Accounting Standards No. 87 (SFAS 87),
"Employers' Accounting for Pensions," the Company has recorded a minimum pension
liability for certain plans, representing the excess of the ABO over plan assets
and accrued pension costs. A corresponding amount was recognized as an
intangible asset, except to the extent that these additional liabilities
exceeded related unrecognized prior service cost and net transition obligation,
in which case the increase in liabilities was charged directly to shareholders'
equity. For 1993, the excess minimum pension liability resulted in a $7 million
charge to shareholders' equity, net of income taxes.

<PAGE>
 
NOTE 4--POSTRETIREMENT BENEFITS OTHER THAN PENSIONS

Nalco has defined benefit postretirement plans that provide medical, dental, and
life insurance benefits for substantially all United States retirees and
eligible dependents. Nalco retains the right to change or terminate these
benefits. Effective January 1, 1993, the Company implemented, on the immediate
recognition basis, SFAS 106, "Employers' Accounting for Postretirement Benefits
Other than Pensions." This statement requires that the cost of these benefits be
recognized in the financial statements during an employee's active working
career with the Company. Nalco's previous practice was to expense these costs as
incurred.

The adoption of SFAS 106 resulted in a noncash charge of $57 million, net of $33
million of income tax benefits. The expense accrued in 1993 exceeded the amount
under the previous accounting method by $8 million before taxes. Nalco's cash
flows will be unaffected by this accounting change because Nalco intends to
continue its current practice of paying most costs of these postretirement
benefits as the claims are incurred.

The postretirement benefit expense for 1993 totaled $10 million and included $3
million for service cost of benefits earned and $7 million for interest cost on
the accumulated postretirement benefit obligation.

Costs of these benefits were $2 million in 1992 and 1991, and were funded from
current Company cash flows and charged to earnings as claims were paid.
<PAGE>
 
The 1993 accrued postretirement benefit liability included the following
components:

<TABLE>
<CAPTION>
 
<S>                                                              <C>
(in millions)
- ----------------------------------------------------------------------
Actuarial present value of postretirement benefit obligations
 Retirees                                                        $41.6
 Fully eligible active plan participants                          12.2
 Other active plan participants                                   34.8
                                                                 -----
Accumulated postretirement benefit obligation                     88.6
Unrecognized net gain                                              8.3
                                                                 -----
Accrued postretirement benefit liability                          96.9
Less current portion                                               2.7
                                                                 -----
Noncurrent liability                                             $94.2
                                                                 =====
</TABLE>

Measurement of the accumulated postretirement benefit obligation was based on a
7.5 percent discount rate and a health care cost trend rate of 11.5 percent for
1993, decreasing 0.5 percent per year to an ultimate rate of 5.5 percent. A one-
percentage-point increase in the assumed health care cost trend rate would have
increased the 1993 postretirement benefit expense by approximately $2 million
and would have increased the 1993 accumulated postretirement benefit obligation
by $12 million.

<PAGE>
 
NOTE 5--EMPLOYEE STOCK OWNERSHIP PLAN (ESOP) AND PROFIT SHARING PLAN

In 1989, Nalco established an ESOP to give most domestic employees an additional
opportunity to share in the ownership of the Company's stock. The ESOP purchased
415,800 shares of preferred stock for $200 million with proceeds from loans
described in Note 13. These shares are allocated to eligible employees based on
a percentage of pretax earnings. See Note 14 for more detail on the preferred
stock.

Selected information about the ESOP for the past three years is as follows:

<TABLE>
<CAPTION>
(in millions)                    1993   1992   1991
- ----------------------------------------------------
<S>                              <C>    <C>    <C>
Preferred stock dividends        $15.7  $15.9  $15.9
Interest expense on ESOP debt     10.3   11.1   13.0
ESOP benefit expense               1.2    0.9    2.4
ESOP contribution payments           -      -    1.7
- ----------------------------------------------------
</TABLE>

Prior to the establishment of the ESOP, the Company funded a profit sharing
plan. Past contributions were made to a bank trustee for investment in Nalco
common stock for the accounts of participating employees. At the end of 1993,
the trustee of the plan held 3,765,713 shares of Nalco common stock,
representing 5.5 percent of the outstanding shares.

<PAGE>
 
NOTE 6--LEASE COMMITMENTS AND RENTAL EXPENSE

Nalco has a number of operating leases for office space and equipment. Rental
expense amounted to $14 million in 1993, $15 million in 1992, and $13 million in
1991. Future minimum payments under noncancellable operating leases as of
December 31, 1993 are not material.
<PAGE>
 
NOTE 7--STOCK OPTION, RESTRICTED STOCK, AND PERFORMANCE PLANS

Nalco's 1990 Stock Option Plan for key management employees authorized the
granting of stock options for the purchase of up to 6,000,000 shares of Nalco
common stock. Nalco's 1982 Stock Option Plan authorized the granting of either
incentive stock options or non-qualified options for the purchase of up to
6,000,000 shares of Nalco's common stock. No additional grants will be made
under the 1982 plan. The option price under both plans cannot be less than the
fair market value on the date of grant. Options granted since 1989 become
exercisable ratably over the three years following the grant date, and will
expire 10 years after the date granted. Options granted prior to 1989 have a
term of 10 years, and became exercisable upon grant. Options may be exercised in
whole or in part for cash, shares of common stock, or a combination thereof.

The changes in shares under option to employees are summarized as follows:

<TABLE>
<CAPTION>
                                                 1993        1992        1991
- -------------------------------------------------------------------------------
<S>                                           <C>         <C>         <C>
At beginning of year                          4,348,644   3,205,028   3,719,000
Options granted - price per share
 1993-$36.31; 1992-$36.00; 1991-$29.81          491,600   1,776,220      99,600
Options exercised - average price per share
 1993-$17.81; 1992-$16.75; 1991-$17.05         (518,734)   (601,004)   (594,306)
Options expired or cancelled                    (62,033)    (31,600)    (19,266)
At end of year - average price per share
 1993-$28.09; 1992-$26.03; 1991-$18.80        4,259,477   4,348,644   3,205,028
Options exercisable at end of year            2,639,155
- -------------------------------------------------------------------------------
</TABLE>

The 1990 Stock Option Plan for Non-Employee Directors authorizes the granting of
stock options to outside directors for the purchase of up to 500,000 common
shares. The option price under the plan cannot be less than the fair market
value on the date of the grant and options expire 10 years from the grant date.
A total of 36,000 options were granted under the directors' plan during 1993 at
an option price of $32.94 per share, and a total of 32,000 options were granted
each year under the directors' plan during 1992 and 1991 at option prices of
$33.25 and $31.97 per share, respectively. These options became exercisable upon
grant, but none have yet been exercised.

A Restricted Stock Plan for key management employees provides for the grant of
"share units" which, upon vesting, are paid in shares of Nalco common stock on a
one-for-one basis. One-half of the units granted normally vest five years from
the date of award, and the remaining half vest at retirement, 
<PAGE>
 
if the grantee retires directly from Nalco under the Retirement Income Plan.
However, all of these contingent share units vest automatically in the event of
death, disability, or in the event of a change in control of the Company. Not
more than 500,000 share units may be awarded. The remaining number of share
units available for award under the plan at December 31, 1993 was 275,830, and
99,420 share units were outstanding at year end.

A Performance Unit Plan provided for the annual assignment of contingent
performance units to designated officers and other key executives. The
contingent units assigned were earned, subject to the attainment of goals for
growth in earnings for each performance period. Payment of earned awards are
made in cash following the conclusion of the applicable performance period.

A Performance Share Plan for designated officers and other key executives was
approved by shareholders in 1992. It provides for the annual assignment of
performance shares which are contingent upon future earnings growth of the
Company. Performance awards shall be paid half in cash and half in the Company's
common stock, except that any payments made after 1,000,000 shares have been
issued shall be made only in cash and only with respect to contingent
performance shares already assigned. The cash portion of an award shall be paid
after determination of the award; however, the right to receive common shares
shall not vest to a participant until three years after the end of a performance
period.

Charges to earnings for all plans aggregated $4 million, $5 million, and $1
million in 1993, 1992, and 1991, respectively.
<PAGE>
 
NOTE 8--INCOME TAXES

Effective January 1, 1993, Nalco adopted Statement of Financial Accounting
Standards No. 109 (SFAS 109), "Accounting for Income Taxes." The cumulative
effect of the change in the method of accounting for income taxes as of the
beginning of 1993 was not material.

A significant amount of earnings from continuing consolidated operations before
income taxes is from foreign sources, as reflected in the following tabulation:

<TABLE>
<CAPTION>
(in millions)     1993    1992    1991
- ---------------------------------------
<S>              <C>     <C>     <C>
Domestic         $182.6  $165.9  $152.4
Foreign            67.2    72.4    66.4
                 ------  ------  ------
Total            $249.8  $238.3  $218.8
                 ======  ======  ======
</TABLE>

The components of income tax provisions attributable to earnings from continuing
consolidated operations are summarized as follows:

<TABLE>
<CAPTION>
(in millions)    1993   1992    1991
- ------------------------------------
<S>              <C>    <C>    <C>
Current
 Federal         $55.3  $32.1  $35.0
 State             9.5    6.5    6.5
 Foreign          26.8   36.9   34.8
                 -----  -----  -----
                  91.6   75.5   76.3
                 -----  -----  -----
Deferred
 Federal           3.0   13.6    9.9
 State             0.8    2.8    1.7
 Foreign           1.7    1.4   (3.7)
                 -----  -----  -----
                   5.5   17.8    7.9
                 -----  -----  -----
Total            $97.1  $93.3  $84.2
                 =====  =====  =====
</TABLE>

Current foreign taxes listed above include taxes withheld by foreign governments
on distributions from subsidiaries and affiliates (principally dividends and
service fees).
<PAGE>
 
Nalco made income tax payments of $87 million, $77 million, and $85 million
during 1993, 1992, and 1991, respectively.

The effective income tax rate varies from the federal statutory rate because of
the factors indicated below:

<TABLE>
<CAPTION>
                                                            1993    1992   1991
- -------------------------------------------------------------------------------
<S>                                                        <C>      <C>    <C>
Statutory U.S. federal tax rate                              35.0%  34.0%  34.0%
State income taxes, net of federal tax benefit                2.7    2.6    2.4
Foreign earnings subject to higher rates                      0.6    2.0    1.6
Other                                                         0.6    0.6    0.5
                                                             ----   ----   ----
Effective tax rate                                           38.9%  39.2%  38.5%
                                                             ====   ====   ====
</TABLE> 
 
Details of the 1993 deferred tax assets and liabilities are as follows:

<TABLE> 
<CAPTION>  
(in millions)
- -----------------------------------------------------------------
 <S>                                                       <C> 
 Deferred tax assets:
    Postretirement benefits                                $ 39.1
    Early retirement of debt                                  5.1
    Other                                                    15.6
                                                           ------
                                     
    Total                                                    59.8
                                                           ------
                                     
 Deferred tax liabilities:           
                                     
    Depreciation                                             72.0
    Leveraged lease investments                              35.6
    Other                                                    10.3
                                                           ------
                                     
    Total                                                   117.9
                                                           ------
                                     
 Net deferred tax liability                                $ 58.1
                                                           ======
</TABLE>
<PAGE>
 
NOTE 9--ACQUISITIONS

In March 1991 the Company acquired the remaining interest in five affiliated
companies for $171 million. Each of these companies provides Nalco's water
treatment and specialty process chemicals to customers. Nalco already owned 49
percent of the common shares of each of these companies and had been accounting
for earnings on the equity basis. The operations of these former affiliated
companies were consolidated effective April 1991.

If the acquisitions had occurred at the beginning of 1991, unaudited pro forma
results for 1991 would have reflected net sales and net earnings of $1,281
million and $133 million, respectively. Earnings per common share would have
been $1.76 on a primary basis and $1.65 fully diluted.
<PAGE>
 
NOTE 10--DISCONTINUED OPERATIONS

In 1991 the results of our U.S. Subsidiaries, Day-Glo Color Corp., Adco
Products, Inc., and the Penray Companies were reported as discontinued
operations because Day-Glo Color Corp. was sold, and the net assets of the other
two companies were held for sale.  The Penray Companies were sold in  1992, and
Adco Products, Inc. was sold in 1993.

The net carrying amount of assets of discontinued operations consisted primarily
of accounts receivable, inventory, and property, plant, and equipment less
related liabilities at December 31, 1992 and 1991.
<PAGE>
 
NOTE 11--FINANCE SUBSIDIARIES

Nalco has four finance subsidiaries, one wholly-owned and three 80%-owned, which
were established to increase the return on financial assets. These subsidiaries
are the lessor of a diversified portfolio of leveraged leases involving
creditworthy lessees. Amounts related to the finance subsidiaries which are
included in the Statements of Consolidated Financial Condition and Earnings are
as follows:

<TABLE>
<CAPTION>
(in millions)                      1993   1992   1991
- ------------------------------------------------------
<S>                                <C>    <C>    <C>
AT YEAR END
Leveraged lease investments        $44.6  $43.9  $44.4
Current liabilities                  1.8    1.6    1.8
Deferred income taxes and other     35.6   35.9   35.6
                                   -----  -----  -----
Net assets                         $ 7.2  $ 6.4  $ 7.0
                                   -----  -----  -----
FOR THE YEAR
Net earnings                       $ 1.5  $ 1.0  $ 1.3
Dividends received by Nalco          0.3    0.3    0.4
- ------------------------------------------------------
</TABLE>

Investments in leased property represent future rentals and residuals, net of
nonrecourse debt. The leased assets are financed primarily by nonrecourse loans
which are secured by the lessees' rental obligations and the leased property,
but ownership of the property is retained by the finance subsidiaries. Such
loans amounted to approximately $59 million at both December 31, 1993 and 1992,
and $61 million at December 31, 1991. Income from leveraged lease transactions
is reported on the financing method, which requires income recognition over the
life of the lease at a level rate of return on the positive net investment.
<PAGE>
 
NOTE 12--PROPERTY, PLANT, AND EQUIPMENT

Property, plant, and equipment (including major improvements) are recorded at
cost. Depreciation of buildings and equipment is calculated over their estimated
useful lives generally using the straight-line method. The estimated useful
lives of the major classes of depreciable assets are as follows: buildings 15 to
40 years; equipment 3 to 15 years.

Property, plant, and equipment consists of the following:

<TABLE>
<CAPTION>
(in millions)                    1993      1992      1991
- ----------------------------------------------------------
<S>                           <C>       <C>        <C>
Land                          $   39.1  $   37.4   $  33.6
Buildings                        215.2     207.0     203.6
Equipment                        875.6     799.8     720.6
                              --------  --------   -------
                               1,129.9   1,044.2     957.8
Allowances for depreciation     (571.4)   (510.9)   (464.2)
                              --------  --------   -------
                              $  558.5  $  533.3   $ 493.6
                              ========  ========   =======
</TABLE>
<PAGE>
 
NOTE 13--DEBT

Long-term debt consists of the following:
<TABLE>
<CAPTION>
 
(in millions)        1993    1992    1991
- ------------------------------------------
<S>                 <C>     <C>     <C>
ESOP loans          $179.9  $186.0  $190.5
Commercial paper         -   160.0   160.0
Other                 72.2    67.8    43.6
                    ------  ------  ------
Total               $252.1  $413.8  $394.1
                    ======  ======  ======
</TABLE>

In 1989, the ESOP borrowed $200 million to purchase preferred stock from the
Company.  Nalco borrowed $66 million which was subsequently loaned to the ESOP,
and guaranteed the balance of $134 million.  Borrowings related to the ESOP are
reflected as long-term debt with a corresponding reduction of shareholders'
equity (unearned ESOP compensation).  The ESOP is repaying the loans and
interest over a projected 13-year period using Company contributions and
dividends from preferred stock. As the principal amount of the borrowings is
repaid, the debt and the unearned ESOP compensation are being reduced. $88
million of borrowings are variable rate notes which are presently remarketed on
a monthly basis with a final maturity on December 31, 2008.  Any notes which
cannot be successfully remarketed will be purchased by the Company or one of its
subsidiaries.  The Company entered into an interest rate swap agreement which
effectively converted the $88 million of variable rate notes into fixed-rate
debt of 7.3 percent.  The remaining borrowings are 8.1 percent fixed-rate loans
with a final maturity in the year 2000.

During 1993, the Company repaid $160 million of commercial paper borrowings
which had been classified as long-term debt. The early retirement of this debt
resulted in an extraordinary loss of $11 million net of tax benefits of $6
million.

The $72 million in other long-term debt includes $45 million owed by two foreign
subsidiaries at variable interest rates. The balance was borrowed by the parent
company and various foreign subsidiaries.

Interest paid by Nalco was $33 million, $44 million, and $36 million in 1993,
1992, and 1991, respectively.
<PAGE>
 
The following table presents the projected annual maturities of long-term debt
for the next five years after 1993:

<TABLE>
<CAPTION>
 (in millions)
- ----------------
 <S>              <C>
   1994           $ 2.4
   1995             0.1
   1996            66.1
   1997            12.0
   1998            12.0
</TABLE>

The amounts above include approximately $90 million in maturities related to the
ESOP loans.  The ESOP is required to repay principal on its loan from Nalco
annually in order to allocate shares to participants, and this loan matures for
Nalco in 1996.

For general purposes and to support the ESOP loans and the issuance of
commercial paper, Nalco has a $340 million Revolving Credit Agreement with
twelve banks. This agreement is structured as a three-year revolving credit with
an option in 1996 to convert the borrowings to a four-year term loan. Borrowings
under the credit agreement would be at rates which, at Nalco's option, vary with
the prime rate, CD rate, or LIBOR. The credit line carries a commitment fee of
.25 percent on the unused portion. The credit arrangements were unused at
December 31, 1993.
<PAGE>
 
NOTE 14--SHAREHOLDERS' EQUITY

Information on preferred and common shares is summarized in the following table:

<TABLE>
<CAPTION>
(dollars in millions, except per share amounts)    1993   1992   1991
- ---------------------------------------------------------------------
<S>                                                <C>    <C>    <C>
Preferred stock, par value $1.00 per share;
 authorized 2,000,000 shares;
   Series B ESOP Convertible
     Preferred Stock--outstanding;
     407,806 shares-1993, 411,032
     shares-1992, and 414,037 shares
     -1991                                         $ 0.4  $ 0.4  $ 0.4
   Series A Junior Participating
     Preferred Stock--none issued
Common stock, par value $.1875 per share;
 authorized 200,000,000 shares;
   issued 80,287,568 shares                         15.1   15.1   15.1
- ----------------------------------------------------------------------
</TABLE> 

There were 11,383,105 shares, 10,266,979 shares, and 10,459,404 shares held in
treasury at December 31, 1993, 1992, and 1991, respectively.

In 1990, Nalco's Board of Directors authorized the repurchase of up to 2 million
shares of the Company's common stock. During 1993, the repurchase of those
shares was completed and the Board of Directors authorized the repurchase of an
additional 2 million shares.

The Company issued 415,800 shares of preferred stock to the ESOP in 1989 for
$481.00 per share, the preference price upon liquidation. This preferred stock
ranks senior to Series A Junior Participating Stock and common stock as to the
payment of dividends and the distribution of assets on liquidation, dissolution
and winding up of Nalco. Dividends on each share of preferred stock are
cumulative and will be paid quarterly at the rate of 8 percent or $38.48 per
annum. Full conversion of preferred shares occurs upon a holder's retirement or
separation of service from the Company, and effective in 1999 participants in
the ESOP may partially convert their stock upon reaching age 55. The conversion
ratio and number of votes per share of preferred stock are subject to adjustment
under certain conditions. The preferred stock entitles a participant to 20 votes
per share, voting together with the holders of common stock and initially was
convertible into 20 shares of common stock. The shares of preferred stock are
redeemable by Nalco at $500.24 per share, and at prices declining annually to
$481.00 per share on or after May 15, 1997. Also, the shares of preferred stock
may be required to be redeemed by Nalco under certain circumstances. During
1993, 3,226 preferred shares were converted to 61,566 common shares of Nalco
Stock. During 1992 and 1991, 3,005 and 1,102 preferred shares were converted to
60,082 and 26,318 common shares, respectively. Approximately 8,300,000 common
shares have been reserved for 
<PAGE>
 
the conversion of preferred stock.

In 1986, the Board of Directors declared a dividend distribution of one
Preferred Share Purchase Right (Right) for each outstanding share of common
stock. The Rights, as amended in 1989, are not exercisable or transferrable
apart from the common stock until a person or group has acquired, or makes a
tender offer for 15 percent or more of the common stock. If Nalco is acquired in
a merger or other business combination transaction, each Right other than that
held by the acquiring party will entitle the holder to receive, upon exercise at
a price of $50, common stock of either Nalco or the acquiring company having a
value equal to two times that price. The Rights are redeemable at $.025 each at
any time before a 15 percent or greater position has been acquired, and expire
on August 31, 1996.
<PAGE>
 
NOTE 15--CONTINGENCIES AND LITIGATION

Nalco has been named as a potentially responsible party by the Environmental
Protection Agency (EPA) or state enforcement agencies at 10 waste sites
where some financial contribution is or may be required.

These agencies have also identified many other parties who may be responsible
for clean-up costs at the waste disposal sites. Nalco's financial contribution
to clean up these sites is expected to be minor. There has been no significant
financial impact on Nalco up to the present, nor is it anticipated that there
will be in the future, as a result of these matters. Nalco has and will continue
to make provisions for these costs when the Company's liability can be
reasonably estimated. As of December 31, 1993, the Company had reserves of
approximately $2 million for potential future environmental clean-up costs. The
Company's 1993 expenditures relating to environmental compliance and clean-up
activities were not significant. The environmental reserves represent
management's current estimate of its proportional clean-up costs and are not
reduced by any possible recoveries from insurance companies or other potentially
responsible parties not specifically identified by the EPA. Although management
cannot determine whether or not a material effect on future operations is
reasonably likely to occur, it believes that the recorded reserve levels are
appropriate estimates of the potential liability. Further, management believes
that the additional maximum exposure level in excess of the recorded reserve
level would not be material to the financial condition of the Company. Although
settlement of the reserves will cause future cash outlays, it is not expected
that such outlays will materially impact the Company's liquidity position.

In the ordinary course of its business, Nalco is also a party to a number of
lawsuits and is subject to various claims, the outcome of which, in the opinion
of management, should not have a material effect on the consolidated financial
position of Nalco.
<PAGE>
 
NOTE 16--FAIR VALUE OF FINANCIAL INSTRUMENTS

The carrying values of cash and cash equivalents, short-term marketable
securities, short-term debt, commercial paper borrowings, and term borrowings at
variable interest rates approximated their fair values at December 31, 1993 and
1992.

A currency swap which hedges a net investment in a foreign subsidiary was an
asset with a fair value of $9 million, based on current settlement prices, which
did not differ materially from the carrying value at December 31, 1993.

The fair value of certain interest rate swap liabilities, based on current
settlement prices, approximated the carrying value of $15 million at December
31, 1993.

The fair value of the Company's fixed-rate ESOP borrowings at December 31, 1993
and 1992 was approximately $121 million and $120 million, respectively, which
was estimated using discounted cash flow analyses, based on the Company's
current borrowing rates for similar types of borrowing arrangements.

The fair value of the Company's off-balance-sheet financial instruments such as
foreign currency forward contracts, currency swaps, and interest rate swaps was
a net liability of $10 million and $7 million at December 31, 1993 and 1992,
respectively, which was estimated using quoted market prices of comparable
contracts and pricing models or formulas using current assumptions.
<PAGE>
 
NOTE 17--SUBSEQUENT EVENTS

On February 3, 1994, Nalco and Exxon Chemical Company, a division of Exxon
Corporation, announced that they had signed a memorandum of understanding to
form a worldwide energy chemicals joint venture. The joint venture will include
Nalco's U.S. Petroleum Chemicals Division business units, certain petroleum
chemical product lines of its international operations, and Exxon Chemical
Company's Energy Chemicals worldwide business.

The new company, to be named Nalco/Exxon Energy Chemicals, is targeted to start
up by mid-1994, pending government and regulatory approvals and definitive
agreements between the two companies.

On that same date, the Company announced that it had entered into a letter of
intent to sell its Freeport, Texas plant and its automotive paint spray booth
business to PPG Industries, Inc.

The Freeport plant, which has 27 Nalco employees, produces chemical products for
the oil production and refining market. It is expected that the Nalco/Exxon
Energy Chemicals joint venture will purchase certain of its requirements for
these products from PPG.

Nalco's worldwide automotive paint spray booth business, approximately $10
million in size, would be included in the sale to PPG. Nalco has agreed to sell
and service the water treatment related applications for PPG in the automotive
facilities associated with the business sold.
<PAGE>
 
<TABLE>
<CAPTION>
QUARTERLY SUMMARY (UNAUDITED)
                                                            1993                                        1992
                                              ----------------------------------         ----------------------------------
(Dollar amounts in millions,                   First   Second    Third   Fourth           First   Second    Third   Fourth
except per share figures)                     Quarter  Quarter  Quarter  Quarter         Quarter  Quarter  Quarter  Quarter
- ---------------------------------------------------------------------------------------------------------------------------
<S>                                           <C>      <C>      <C>      <C>             <C>      <C>      <C>      <C>
 
Sales                                          $339.0   $347.5   $354.0   $348.9          $326.4   $340.3   $349.5   $358.3
 
Gross earnings                                  188.9    195.7    199.1    196.8           179.7    189.2    192.5    201.6
 
Earnings from operations                         35.1     38.1     38.7     40.8            33.0     36.4     34.8     40.8
 
Extraordinary loss from
  retirement of debt                            (10.6)       -        -        -               -        -        -        -
 
Cumulative effect of
  accounting change                             (56.5)       -        -        -               -        -        -        -
 
Net earnings (loss)                             (32.0)    38.1     38.7     40.8            33.0     36.4     34.8     40.8
 
Per common share
  Earnings-fully diluted
    Earnings from operations                      .43      .46      .48      .51             .41      .45      .43      .50
    Extraordinary loss and
      accounting change                          (.85)       -        -        -               -        -        -        -
    Net earnings (loss)                          (.42)     .46      .48      .51             .41      .45      .43      .50
 
  Dividends                                       .21     .225     .225     .225             .21      .21      .21      .21
 
  Market price
     High                                      37 3/8   36 3/8   36 3/8   37 7/8          40 7/8       37       36   37 3/4
     Low                                       32 1/2   31 1/4   32 1/2   30 1/4          33 1/4       30 3/4   32   30 3/8
- ---------------------------------------------------------------------------------------------------------------------------
 
</TABLE>
<PAGE>
 
<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------- 
ELEVEN YEAR SUMMARY                                        
(Dollar amounts in millions                                
except per share figures)                                              1993       1992       1991
- ------------------------------------------------------------------------------------------------- 
<S>                                                                <C>        <C>        <C>
NET SALES                                                          $1,389.4   $1,374.5   $1,237.3
Operating costs and expenses                               
  Cost of products sold                                               608.9      611.5      557.0
  Selling and service                                                 414.3      401.4      360.4
  Research and development                                             50.4       48.0       45.9
  Administrative and general                                           52.9       53.3       47.0
- ------------------------------------------------------------------------------------------------- 
TOTAL OPERATING COSTS AND EXPENSES                                  1,126.5    1,114.2    1,010.3
- ------------------------------------------------------------------------------------------------- 
OPERATING EARNINGS                                                    262.9      260.3      227.0
Interest and other income                                              14.4       18.3       18.9
Interest expense                                                      (27.5)     (40.3)     (27.1)
- ------------------------------------------------------------------------------------------------- 
EARNINGS FROM CONTINUING OPERATIONS BEFORE INCOME TAXES               249.8      238.3      218.8
Income taxes                                                           97.1       93.3       84.2
- ------------------------------------------------------------------------------------------------- 
EARNINGS FROM CONTINUING OPERATIONS                                   152.7      145.0      134.6
Earnings (loss) from discontinued operations                              -          -        3.2
- ------------------------------------------------------------------------------------------------- 
EARNINGS BEFORE EXTRAORDINARY LOSS AND                     
  EFFECT OF ACCOUNTING CHANGE                                         152.7      145.0      137.8
Extraordinary loss from retirement of                      
  debt, net of taxes                                                  (10.6)         -          -
Cumulative effect of change in accounting                  
  for postretirement benefits other than                     
  pensions, net of taxes                                              (56.5)         -          -
- ------------------------------------------------------------------------------------------------- 
NET EARNINGS                                                       $   85.6   $  145.0   $  137.8
=================================================================================================
PER SHARE OF COMMON STOCK                                  
Earnings from continuing operations--primary                       $   2.03   $   1.90   $   1.78
Discontinued operations                                                   -          -        .04
Extraordinary item                                                     (.15)         -          -
Accounting change                                                      (.81)         -          -
Net earnings                                                           1.07       1.90       1.82
Net earnings--fully diluted                                            1.02       1.79       1.71
Cash dividends paid                                                    .885        .84        .83
- ------------------------------------------------------------------------------------------------- 
FINANCIAL RATIOS                                           
Earnings as a percent to sales*                                        11.0%      10.5%      10.9%
Earnings as a percent to shareholders' equity*                         28.6       25.7       27.6
Effective income tax rate*                                             38.9       39.2       38.5
Common stock dividends paid as a percent to earnings*                  40.0       40.6       42.9
Research and development expenses as a percent to sales*                3.6        3.5        3.7
Current ratio                                                      2.0 to 1   2.5 to 1   2.0 to 1
- ------------------------------------------------------------------------------------------------- 
FINANCIAL POSITION DATA                                    
Working capital                                                    $  185.4   $  314.3   $  256.3
Total assets                                                        1,212.4    1,350.6    1,324.4
Property, plant, and equipment (cost)                               1,129.9    1,044.2      957.8
Long-term debt                                                        252.1      413.8      394.1
Deferred income taxes                                                  58.1      107.3       90.8
Shareholders' equity                                                  550.6      576.3      528.7
- ------------------------------------------------------------------------------------------------- 
OTHER DATA                                                 
Working capital provided from operations                           $  245.6   $  226.7   $  218.5
Capital investments                                                   117.8      131.0      136.8
Depreciation and amortization*                                         86.5       79.4       64.6
Dividends on common stock                                              61.1       58.8       57.8
Cost of common stock repurchased                                       58.5       14.3          -
Wages, salaries, commissions, and benefits                            413.6      403.7      376.6
Common shares outstanding at year end (thousands)                    68,905     70,021     69,828
Market price per share of common stock at year end                 $  37.50   $ 34.625   $ 41.625
Number of common shareholders of record                               6,111      6,129      5,543
Number of employees at year end                                       6,802      6,714      6,832
- ------------------------------------------------------------------------------------------------- 
</TABLE> 
NOTE: Shares outstanding and per share amounts have been restated to reflect the
two-for-one stock split in 1991.
 
* based on earnings from continuing operations before extraordinary loss and
  effect of accounting change.
<PAGE>
 
<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------- 

 
      1990           1989       1988       1987       1986       1985       1984       1983
- ------------------------------------------------------------------------------------------- 
<S>               <C>        <C>        <C>        <C>        <C>        <C>        <C>
  $1,068.1        $ 949.6    $ 892.6    $ 756.0    $ 658.5    $ 658.6    $ 655.8    $ 606.3
 
     484.5          439.5      418.9      355.4      298.3      301.2      303.5      280.9
     294.0          254.8      238.7      205.7      185.8      172.4      172.0      158.9
      40.4           35.6       32.4       30.7       29.2       29.9       30.3       28.6
      50.2           47.2       50.0       38.9       41.4       34.3       34.9       30.7
- ------------------------------------------------------------------------------------------- 
     869.1          777.1      740.0      630.7      554.7      537.8      540.7      499.1
- ------------------------------------------------------------------------------------------- 
     199.0          172.5      152.6      125.3      103.8      120.8      115.1      107.2
      19.9           27.0       20.6       14.9       12.6       10.9       15.0       12.9
     (11.5)          (9.7)      (9.5)      (8.2)      (6.0)      (3.9)      (4.2)      (4.6)
- ------------------------------------------------------------------------------------------- 
     207.4          189.8      163.7      132.0      110.4      127.8      125.9      115.5
      80.0           72.5       59.6       53.2       48.1       54.3       52.8       50.1
- ------------------------------------------------------------------------------------------- 
     127.4          117.3      104.1       78.8       62.3       73.5       73.1       65.4
       3.7            2.6        1.9        1.5        1.4       (0.2)       3.1        5.6
- ------------------------------------------------------------------------------------------- 
 
     131.1          119.9      106.0       80.3       63.7       73.3       76.2       71.0

         -              -          -          -          -          -          -          - 
 

         -              -          -          -          -          -          -          - 
- ------------------------------------------------------------------------------------------- 
  $  131.1        $ 119.9    $ 106.0    $  80.3    $  63.7    $  73.3    $  76.2    $  71.0
===========================================================================================
 
     $1.66        $  1.47    $  1.33    $   .99    $   .79    $   .94    $   .93    $   .82
       .05            .03        .02        .02        .02          -        .04        .07
         -              -          -          -          -          -          -          - 
         -              -          -          -          -          -          -          - 
      1.71           1.50       1.35       1.01        .81        .94        .97        .89
      1.60           1.46       1.35       1.01        .81        .93        .97        .89
      .755            .68       .645        .60        .60        .60        .60        .57
- ------------------------------------------------------------------------------------------- 
 
      11.9%          12.3%      11.7%      10.4%       9.5%      11.2%      11.1%      10.8%
      29.1           25.4       22.3       18.4       15.7       20.1       20.8       19.0
      38.6           38.2       36.4       40.3       43.6       42.5       41.9       43.4
      41.5           43.5       48.5       59.9       75.6       63.9       64.4       69.4
       3.8            3.7        3.6        4.1        4.4        4.5        4.6        4.7
  2.3 to 1       2.3 to 1   2.1 to 1   1.8 to 1   1.7 to 1   1.8 to 1   2.4 to 1   2.3 to 1
- ------------------------------------------------------------------------------------------- 
 
  $  229.7        $ 218.5    $ 174.4    $ 121.8    $  86.7    $  80.7    $ 120.5    $ 130.3
   1,037.0          938.5      838.9      781.8      621.9      571.1      484.6      493.6
     840.3          720.1      648.7      607.5      547.6      499.0      426.1      389.1
     282.2          214.0      100.8       72.8       38.4       36.5       18.8       18.6
      77.8           62.7       53.7       47.3       42.3       34.4       21.3       14.0
     455.6          443.7      477.5      446.8      407.5      384.2      352.1      350.5
- ------------------------------------------------------------------------------------------- 
 
  $  192.4        $ 159.1    $ 148.4    $ 132.9    $ 113.2    $ 113.0    $ 109.7    $ 101.5
     114.9           86.4       61.6       57.2       63.6       59.9       52.5       40.5
      47.5           39.8       42.4       39.7       37.8       32.9       32.8       29.2
      52.9           51.0       50.5       47.2       47.1       47.0       47.1       45.4
      80.5          111.7       21.5       11.6          -          -       19.7          -
     326.0          282.5      263.8      231.3      203.7      195.4      182.0      172.3
    69,292         72,199     77,129     78,298     78,542     78,308     78,213     79,687
  $  28.25        $ 24.75    $17.625    $16.625    $ 13.75    $13.375    $ 13.25    $ 15.50
     5,099          5,224      5,477      5,668      5,821      6,156      5,751      5,125
     5,862          5,489      5,381      5,085      4,868      5,065      4,751      4,596
- ------------------------------------------------------------------------------------------- 
</TABLE>
<PAGE>
 
BOARD OF DIRECTORS

Harold G. Bernthal/E,C,B/(1980)
Chairman,
CroBern, Inc.
Health and investment company

W. H. Clark/E,B/(1980)
Chairman and Chief Executive Officer

Harry Corless/A/(1989)
Retired Chairman,
ICI Americas, Inc.
Chemicals and pharmaceuticals company

Howard M. Dean/C,B/(1987)
Chairman and Chief Executive Officer,
Dean Foods Company
Diversified food processor and distributor

John P. Frazee, Jr./A/(1985)
Retired President and Chief Operating Officer
Sprint Corporation
Telecommunications company

Arthur L. Kelly/C/(1992)
Managing Partner,
KEL Enterprises Ltd.
Holding and investment company

Frederick A. Krehbiel/A/(1990)
Chairman and Chief Executive Officer,
Molex Incorporated
Electrical and electronic equipment company

Edward J. Mooney/E,B/(1988)
President and Chief Operating Officer

Charles W. Parry/E,A/(1985)
Retired Chairman and Chief Executive Officer,
Aluminum Company of America
Aluminum and advanced materials company

William A. Pogue/E,C,B/(1981)
Retired Chairman and Chief Executive Officer,
CBI Industries, Inc.
Metal fabrication and investment company

John J. Shea/A/(1993)
President and Chief Executive Officer,
Spiegel, Inc.
Apparel, special retail and catalog sales

(Year in which elected)

Committee assignments effective April 23, 1993

/E/Executive Committee
/A/Audit Committee
/C/Executive Compensation Committee
/B/Board Affairs and Nominating Committee
<PAGE>
 
CORPORATE OFFICERS

W. H. Clark (61)
Chairman and Chief Executive Officer
34 years of service

Edward J. Mooney (52)
President and Chief Operating Officer
25 years of service

Milford B. Harp (56)
Executive Vice President,
International Operations
30 years of service

W. Steven Weeber (51)
Executive Vice President,
Operations Staff
27 years of service

Peter Dabringhausen (55)
Group Vice President
President, Process Chemicals Division
24 years of service

John R. Sutley (50)
Group Vice President
President, Nalco Europe
24 years of service

J. David Tinsley (53)
Group Vice President
President, Water and Waste Treatment Division
28 years of service

Ronald J. Allain (53)
Senior Vice President,
Research and Development
23 years of service

James F. Lambe (48)
Senior Vice President,
Human Resources
24 years of service

David R. Bertran (50)
Senior Vice President,
Manufacturing and Logistics
10 years of service

John D. Berthoud (50)
Vice President,
Marketing and Quality Management
23 years of service

William E. Buchholz (51)
Vice President,
Chief Financial Officer
1 year of service
<PAGE>
 
Christian L. Campbell (43)
Vice President and General Counsel
4 years of service

Francisco A. Laddaga (60)
Vice President, President
Nalco Latin America
28 years of service

Stephen D. Newlin (41)
Vice President,
President Nalco Pacific
18 years of service

Anthony J. Sadowski (55)
Vice President,
Environmental Health and Safety
27 years of service

Jack A. Shubert (43)
Vice President
President, Petroleum Chemicals Division
17 years of service

Dale W. Walker (57)
Vice President,
Corporate Sales
34 years of service

Robert L. Ratliff (45)
Controller
18 years of service

William G. Marshall (47)
Treasurer
13 years of service

Suzzanne J. Gioimo (50)
Secretary
24 years of service

Craig J. Holderness (41)
Assistant Treasurer
16 years of service

Mary D. Hall (37)
Assistant Treasurer

(as of February 15, 1994)
<PAGE>
 
                    NALCO CHEMICAL COMPANY AND SUBSIDIARIES

                          APPENDIX TO 1993 FORM 10-K

                           GRAPHS AND IMAGE MATERIAL

                      1993 ANNUAL REPORT TO SHAREHOLDERS


The following is a list and narrative description of graphs included in those
portions of the 1993 Annual Report to Shareholders expressly incorporated herein
by reference.

In the portion of the Annual Report to Shareholders titled Management's
Discussion and Analysis" the following graphs appear:

Sales, based on continuing operations, in millions of dollars.
The values depicted in the graph are as follows:
<TABLE>
<CAPTION>
 
              Year                      Amount
              ----                      ------
              <S>                       <C>
              1989                      $  950
              1990                      $1,068
              1991                      $1,237
              1992                      $1,375
              1993                      $1,389
</TABLE> 
 
Operating earnings, in millions of dollars.
The values depicted in the graph are as follows:

<TABLE>
<CAPTION>
 
              Year                      Amount
              ----                      ------
              <S>                       <C>
              1989                      $  173
              1990                      $  199
              1991                      $  227
              1992                      $  260
              1993                      $  263
</TABLE> 
 
Depreciation, based on continuing operations, in millions of
 dollars.
The values depicted in the graph are as follows:

<TABLE>
<CAPTION>
 
              Year                      Amount
              ----                      ------
              <S>                       <C>
              1989                        $40
              1990                        $47
              1991                        $61
              1992                        $75
              1993                        $83
</TABLE>
<PAGE>
 
                    NALCO CHEMICAL COMPANY AND SUBSIDIARIES

                          APPENDIX TO 1993 FORM 10-K

                           GRAPHS AND IMAGE MATERIAL

                      1993 ANNUAL REPORT TO SHAREHOLDERS


Shareholders' Equity, in millions of dollars.
The values depicted in the graph are as follows:

<TABLE>
<CAPTION>
 
              Year                     Amount
              -----                     ------
              <S>                       <C>
              1989                       $444
              1990                       $456
              1991                       $529
              1992                       $576
              1993                       $551
</TABLE>

Return on Shareholders' Equity, before extraordinary loss and effect of
accounting change, in percentages.
The values depicted in the graph are as follows:

<TABLE> 
<CAPTION> 

              Year                     Amount
              ----                     ------
              <S>                      <C>
              1989                      26.0%
              1990                      29.9%
              1991                      28.3%
              1992                      25.7%
              1993                      28.6%
</TABLE> 

Cash Provided by Operating Activities, in millions of dollars.
The values depicted in the graph are as follows:

<TABLE>
<CAPTION>
 
              Year                     Amount
              ----                     ------
              <S>                      <C>
              1989                      $169
              1990                      $188
              1991                      $199
              1992                      $208
              1993                      $256
</TABLE> 
 
Capital Additions, in millions of dollars.
The values depicted in the graph are as follows:
 
<TABLE> 
<CAPTION>         
              Year                     Amount
              ----                     ------
              <S>                      <C>
              1989                      $ 86
              1990                      $115
              1991                      $137
              1992                      $131
              1993                      $118
</TABLE>
<PAGE>
 
                    NALCO CHEMICAL COMPANY AND SUBSIDIARIES

                          APPENDIX TO 1993 FORM 10-K

                           GRAPHS AND IMAGE MATERIAL

                      1993 ANNUAL REPORT TO SHAREHOLDERS


Dividends per Common Share, in dollars.
The values depicted in the graph are as follows:
<TABLE>
<CAPTION>
 
              Year                      Amount
              ----                      -------
              <S>                       <C>
              1989                      $  0.68
              1990                      $ 0.755
              1991                      $  0.83
              1992                      $  0.84
              1993                      $ 0.885
</TABLE> 
 
Market Value of Nalco Common Share at Year-End Closing Price, in
 dollars.
The values depicted in the graph are as follows:

<TABLE>
<CAPTION>
 
              Year                      Amount
              ----                      -------
              <S>                       <C>
              1989                      $ 24.75
              1990                      $ 28.25
              1991                      $41.625
              1992                      $34.625
              1993                      $ 37.50
</TABLE>

<PAGE>
 
                                                                    EXHIBIT (21)
 
                    NALCO CHEMICAL COMPANY AND SUBSIDIARIES
 
                                --------------
 
                         SUBSIDIARIES OF THE REGISTRANT
 
  Subsidiaries of the registrant, all of which are wholly-owned unless
otherwise indicated, are as follows:
 
<TABLE>
<CAPTION>
                                                              STATE OR OTHER
                                                              JURISDICTION OF
                                                             INCORPORATION OR
                          COMPANY                              ORGANIZATION
                          -------                           -------------------
<S>                                                         <C>
Domestic:
  Aluminate Sales Corporation.............................. Illinois
  Chicago Chemical Company................................. Illinois
  Board Chemistry, Inc..................................... Illinois
  East End Properties Corporation.......................... Illinois
  Nalco Delaware........................................... Delaware
  Nalco Foreign Sales Corporation.......................... U.S. Virgin Islands
  Nalco FT, Inc............................................ Delaware
  Nalco International Sales Company........................ Delaware
  Nalco Leasing Corporation................................ Delaware
  Nalco Neighborhood Development Corporation............... Delaware
  Nalco Resources Investment Company....................... Texas
  Nalgreen, Inc............................................ Delaware
  Oil Products & Chemical Company, Inc..................... Illinois
  The Flox Company......................................... Minnesota
  Visco Products Company................................... Texas
Foreign:
  Deutsche Nalco-Chemie, G.m.b.H........................... Germany
  Nalco Anadolu A.S........................................ Turkey
  Nalco Applied Services of Europe B.V..................... Netherlands
  Nalco Argentina, S.A..................................... Argentina
  Nalco Australia Pty. Limited............................. Australia
  Nalco Belgium N.V........................................ Belgium
  Nalco Canada, Inc........................................ Canada
  Nalco Chemical A.B....................................... Sweden
  Nalco Chemical B.V....................................... Netherlands
  Nalco Chemical Company (Philippines) Inc................. Philippines
  Nalco Chemical Company (Thailand) Limited................ Thailand
  Nalco Chemical Gesellschaft m.b.H........................ Austria
  Nalco Chemical (H.K.) Limited............................ Hong Kong
  Nalco Chemii............................................. Czechoslovakia
  Nalco de Venezuela, C.A.................................. Venezuela
  Nalco Ecuador, S.A....................................... Ecuador
  Nalco Egypt.............................................. Egypt
  Nalco Espanola, S.A...................................... Spain
  Nalco Europe B.V......................................... Netherlands
  Nalco France............................................. France
  Nalco GIAP--CHEM......................................... Russia
  Nalco Gulf Limited....................................... Dubai
  Nalco Hellas S.A......................................... Greece
  Nalco Holdings Australia Pty. Limited.................... Australia
</TABLE>
<PAGE>
 
<TABLE>
<CAPTION>
                                                                STATE OR OTHER
                                                                JURISDICTION OF
                                                                 INCORPORATION
                            COMPANY                             OR ORGANIZATION
                            -------                             ---------------
<S>                                                             <C>
  Nalco Investments Canada, Inc................................ Canada
  Nalco Investments Australia, Pty. Limited.................... Australia
  Nalco Investments U.K. Limited............................... United Kingdom
  Nalco Italiana, S.p.A........................................ Italy
  Nalco Japan Company, Ltd..................................... Japan
  Nalco Kemiai Kft............................................. Hungary
  Nalco Korea Co., Ltd......................................... South Korea
  Nalco Limited................................................ United Kingdom
  Nalco New Zealand, Ltd....................................... New Zealand
  Nalco Norge A/S.............................................. United Kingdom
  Nalco Poland................................................. Poland
  Nalco Portuguesa (Q.I.) Ltda................................. Portugal
  Nalco Productos Quimicos de Chile S.A........................ Chile
  Nalco Produtos Quimicos Limitada............................. Brazil
  Nalco Saudi Co., Ltd......................................... Saudi Arabia(1)
  Nalco South East Asia Pte. Limited........................... Singapore
  Nalfleet, Inc................................................ United Kingdom
  P.T. Nalco Perkasa........................................... Indonesia
  Quimica Nalco de Colombia, S.A............................... Colombia
  Suomen Nalco Oy.............................................. Finland
  Taiwan Nalco Chemical Co., Ltd............................... Taiwan(2)
  NCC Chemicals (Malaysia) SDN BHD............................. Malaysia
</TABLE>
- --------
Note (1)--60% of voting securities owned by Registrant
Note (2)--55% of voting securities owned by Registrant

<PAGE>
 
                                                                  EXHIBIT (23-1)
 
                       CONSENT OF INDEPENDENT ACCOUNTANTS
 
  We hereby consent to the incorporation by reference in the Prospectus
constituting part of this Registration Statement on Form S-3 (Numbers 2-97721,
33-9934) and Form S-8 (Numbers 33-38033, 33-38032, 33-29149, 2-97721, 2-97131,
2-82642) of our report dated January 25, 1994, except as to Note 17, which is
as of February 3, 1994, which appears on page 16 of the 1993 Annual Report to
Shareholders of Nalco Chemical Company, which is incorporated by reference in
Nalco Chemical Company's Annual Report on Form 10-K for the year ended December
31, 1993. We also consent to the incorporation by reference of our report on
the Financial Statement Schedules, which appears on page 9 of such Annual
Report on Form 10-K.
 
                                          PRICE WATERHOUSE
 
Chicago, Illinois
March 25, 1994
<PAGE>
 
                                                                  EXHIBIT (23-2)
 
                       CONSENT OF INDEPENDENT ACCOUNTANTS
 
  We hereby consent to the incorporation by reference in the Prospectus
constituting part of this Registration Statement on Form S-3 (Numbers 2-97721,
33-9934) and Form S-8 (Numbers 33-38033, 33- 38032, 33-29149, 2-97721, 2-97131,
2-97131, 2-82642) of Nalco Chemical Company of our report dated December 30,
1992 relating to the financial statements of Nalco Investments UK Limited in
this Form 10-K.
 
                                          PRICE WATERHOUSE
March 25, 1994
Liverpool, England
<PAGE>
 
                                                                  EXHIBIT (23-3)
 
                       CONSENT OF INDEPENDENT ACCOUNTANTS
 
  We hereby consent to the incorporation by reference in the Prospectus
constituting part of this Registration Statement on Form S-3 (Numbers 2-97721,
33-9934) and Form S-8 (Numbers 33-38033, 33-38032, 33-29149, 2-97721, 2-97131,
2-82642) of Nalco Chemical Company of our report dated March 18, 1993 relating
to the financial statements of Nalco Australia Pty Limited in this Form 10-K.
 
                                          PRICE WATERHOUSE
 
March 25, 1994
Sydney, Australia
<PAGE>
 
                                                                  EXHIBIT (23-4)
 
                       CONSENT OF INDEPENDENT ACCOUNTANTS
 
  We hereby consent to the incorporation by reference in the Prospectus
constituting part of this Registration Statement on Form S-3 (Numbers 2-97721,
33-9934) and Form S-8 (Numbers 33-38033, 33-38032, 33-29149, 2-97721, 2-97131,
2-82642) of Nalco Chemical Company of our report dated December 23, 1992
relating to the financial statements of Nalco Canada Inc. in this Form 10-K.
 
                                          PRICE WATERHOUSE
 
March 25, 1994
Burlington, Ontario, Canada
<PAGE>
 
                                                                  EXHIBIT (23-5)
 
                        CONSENT OF INDEPENDENT AUDITORS
 
  We consent to the incorporation by reference in the 1993 Annual Report on
Form 10-K of Nalco Chemical Company of our report dated January 26, 1993
included in the Company's 1992 Annual Report to Shareholders and incorporated
by reference in its 1992 Annual Report on Form 10-K.
 
  Our audit also included the consolidated financial schedules of Nalco
Chemical Company listed in Item 14(a) as of December 31, 1992 and 1991 and for
the years then ended. These schedules are the responsibility of the Company's
management. Our responsibility is to express an opinion based on our audits. In
our opinion, the consolidated financial statement schedules referred to above,
when considered in relation to the basic consolidated financial statements
taken as a whole, present fairly in all material respects the information set
forth therein.
 
  We also consent to the incorporation by reference in the following
Registration Statements of Nalco Chemical Company and in the related
Prospectuses of our report dated January 26, 1993 with respect to the
consolidated financial statements and schedules of Nalco Chemical Company as of
December 31, 1992 and 1991 and for the years then ended which are incorporated
by reference in this Annual Report on Form 10-K for the year ended December 31,
1993:
 
<TABLE>
<CAPTION>
                                     COMMISSION FILE NO.
                 -------------------------------------------------------------
                                                                       FORM S-
                 FORM S-8                                                 3
                 --------                                              -------
                 <S>                                                   <C>
                 33-38033                                              2-97721
                 33-38032                                              33-9934
                 33-29149
                  2-97721
                  2-97131
                  2-82642
</TABLE>
 
                                          Ernst & Young
 
Chicago, Illinois
March 25, 1994


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