NALCO CHEMICAL CO
10-K405/A, 1999-04-01
MISCELLANEOUS CHEMICAL PRODUCTS
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<PAGE>
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
 
                      SECURITIES AND EXCHANGE COMMISSION
                             Washington D.C. 20549
 
                                  FORM 10-K/A
 
(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, 1998
                                      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 630-305-1000
          Securities registered pursuant to Section 12(b) of the Act:
           Title of Each Class                Name of Each Exchange on
                                                  Which Registered
        Common Stock par value                 Chicago Stock Exchange
           $0.1875 per share                   New York Stock Exchange
          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 $1,812,008,725 at March 5, 1999.*
 
   The number of shares outstanding of each of the issuer's classes of Common
Stock, as of March 5, 1999 was 65,725,414 shares of Common Stock.
 
                      DOCUMENTS INCORPORATED BY REFERENCE
 
   Portions of the Registrant's 1998 Annual Report to Shareholders are
incorporated by reference into Parts I and II.
 
   Portions of the Registrant's Proxy Statement dated March 29, 1999 for the
April 29, 1999 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 II
 
<TABLE>
<CAPTION>
                                    Page
                                    ----
 <C>     <S>                        <C>
         Financial Statements and
 Item 8  Supplementary Data......     1
 
                                    PART IV
 
         Exhibits, Financial
         Statement Schedules and
 Item 14 Reports on Form 8-K.....   1
</TABLE>
<PAGE>
 
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 1998 Annual Report
to Shareholders, are incorporated herein by reference.
 
   The Quarterly Summary in the Company's 1998 Annual Report to Shareholders
is incorporated herein by reference.
 
                                    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 1998 Annual Report to
Shareholders are incorporated herein by reference in Item 8:
 
     Statements of Consolidated Financial Condition
      December 31, 1998 and 1997
     Statements of Consolidated Earnings
      Years ended December 31, 1998, 1997 and 1996
     Statements of Consolidated Cash Flows
      Years ended December 31, 1998, 1997 and 1996
     Statements of Consolidated Common Shareholders' Equity
      Years ended December 31, 1998, 1997 and 1996
     Notes to Consolidated Financial Statements
     Quarterly Summary (Unaudited)
      Years ended December 31, 1998 and 1997
     Report of Independent Accountants
 
   (2) The following consolidated financial statement schedule for the years
1998, 1997 and 1996 is submitted herewith:
 
     Report of Independent Accountants on Financial Statement Schedule
 
     Schedule II--Valuation and Qualifying Accounts
 
   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>
 <C>         <C> <S>
 Exhibit  3A --  Restated Certificate of Incorporation(/2/)*
 Exhibit  3B --  Certificates of Correction and Amendment to the Restated
                 Certificate of Incorporation(/6/)*
 Exhibit  3C --  Certificate of Designations, Preferences and Rights of Series
                 B ESOP Convertible Preferred Stock(/4/)*
 Exhibit  3D --  Certificate of Designations, Preference and Rights of Series C
                 Junior Participating Preferred Stock(/12/)*
 Exhibit  3E --  By-laws(/9/)*
 Exhibit 10A --  Form of Key Executive Agreement*
  10B        --  Agreements to Restore Benefits Reduced by Excess ERISA-Related
                 Limits(/1/)*
  10C        --  Form of Death Benefit Agreement(/2/)*
  10D        --  Management Incentive Plan(/8/)*
</TABLE>
 
                                       1
<PAGE>
 
<TABLE>
 <C>          <C> <S>
   10E        --  Restricted Stock Plan(/6/)*
   10F        --  1982 Stock Option Plan as amended April 26, 1984, January 30,
                  1987, February 12, 1993, and October 17, 1996(/10/)*
   10G        --  Deferred Compensation Plan for Directors(/3/)*
   10H        --  Supplemental Retirement Income Plan(/5/)*
   10I        --  1990 Stock Option Plan as amended April 23, 1992, February
                  12, 1993, and October 17, 1996(/10/)*
   10J        --  Stock Option Plan for Non-Employee Directors(/7/)*
   10K        --  Directors Benefit Protection Trust of Nalco Chemical
                  Company(/5/)*
   10L        --  Management Benefit Protection Trust of Nalco Chemical
                  Company(/5/)*
   10M        --  Restricted Stock Trust of Nalco Chemical Company(/5/)*
   10N        --  Performance Share Plan as amended effective February 16, 1996
                  and October 17, 1996(/10/)*
   10O        --  Employee Stock Compensation Plan as amended effective January
                  1, 1996 and October 17, 1996(/10/)*
   10P        --  Non-Employee Directors Stock Compensation Plan(/8/)*
 Exhibit  11  --  Computation of Earnings Per Share*
 Exhibit  13  --  Those portions of the 1998 Annual Report to Shareholders
                  expressly incorporated herein by reference
 Exhibit  21  --  Subsidiaries of the Registrant*
 Exhibit  23  --  Consent of Independent Accountants
 Exhibit  27A --  Financial Data Schedule*
 Exhibit  99A --  Notice of Annual Meeting and Proxy Statement(/13/)*
 Exhibit  99B --  September 16, 1996 Letter to Shareholders with Summaries of
                  the Preferred Share Purchase Rights Agreement(/11/)*
 Exhibit  99C --  Form 11-K Annual Report
</TABLE>
Exhibit Nos. 10A-10P constitute management contracts, compensation plans, or
arrangements covering directors and officers of the Company.
 
(b) Reports on Form 8-K filed in the fourth quarter of 1998 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 1990.
(/6/Incorporated)herein by reference from the Registrant's Form 10-K for the
    year ended 1991.
(/7/Incorporated)herein by reference from the Registrant's Form 10-K for the
    year ended 1992.
(/8/Incorporated)herein by reference from the Registrant's Notice of Annual
    Meeting and Proxy Statement dated March 18, 1996.
(/9/Incorporated)herein by reference from the Registrant's Form 10-Q for the
    quarter ended June 30, 1998.
(/10/Incorporated)herein by reference from the Registrant's Form 10-Q for the
     quarter ended September 30, 1996.
(/11/Incorporated)herein by reference from the Registrant's Form 8-K dated
     June 24, 1996.
(/12/Incorporated)herein by reference from the Registrant's Form 8-A dated
     June 24, 1996.
(/13/Incorporated)herein by reference from the Registrant's Notice of Annual
     Meeting and Proxy Statement dated March 29, 1999.
 
*Exhibit was filed with Form 10-K for the year ended December 31, 1998.
 
                                       2
<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
 
                                          By /s/ E. J. Mooney
                                             ----------------------------------
                                             E. J. Mooney
                                             Chairman, Chief Executive Officer
 
                                          Date: April 1, 1999
 
                                       3
<PAGE>
 
                     REPORT OF INDEPENDENT ACCOUNTANTS ON
                         FINANCIAL STATEMENT SCHEDULE
 
To the Board of Directors
of Nalco Chemical Company
 
   Our audits of the consolidated financial statements referred to in our
report dated February 6, 1999 appearing on page 42 of the 1998 Annual Report
to Shareholders 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 Schedule listed
in Item 14(a) of this Form 10-K. In our opinion, this Financial Statement
Schedule presents fairly, in all material respects, the information set forth
therein when read in conjunction with the related consolidated financial
statements.
 
                                          PricewaterhouseCoopers LLP
 
Chicago, Illinois
February 6, 1999
 
                                       4
<PAGE>
 
                    NALCO CHEMICAL COMPANY AND SUBSIDIARIES
 
                 SCHEDULE II--VALUATION AND QUALIFYING ACCOUNTS
 
<TABLE>
<CAPTION>
         Col. A             Col. B           Col. C               Col. D        Col. E
         ------           ---------- -----------------------   ------------   ----------
                                            Additions
                                     -----------------------
                                                     (2)
                                         (1)      Charged To
                          Balance At  Charged To    Other                      Balance
                          Beginning     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:
                                                   $683,000(A)
    December 31, 1998     $4,170,000  $3,602,000      6,000(C)  $2,411,000(B) $6,050,000
                          ==========  ==========   ========     ==========    ==========
                                                                $  938,000(B)
    December 31, 1997     $4,936,000  $  630,000   $ 22,000(A)     480,000(C) $4,170,000
                          ==========  ==========   ========     ==========    ==========
                                                   $738,000(A)
    December 31, 1996     $4,439,000  $  388,000     17,000(C)  $  646,000(B) $4,936,000
                          ==========  ==========   ========     ==========    ==========
</TABLE>
- --------
Note A--Valuation of assets acquired.
Note B--Excess of accounts written off over recoveries.
Note C--Foreign currency translation adjustments.
 
                                       5

<PAGE>
 
                                                                    EXHIBIT (13)


                       REPORT OF INDEPENDENT ACCOUNTANTS

To the Board of Directors
and Shareholders of
Nalco Chemical Company

In our opinion, the accompanying statements 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, 1998 and
1997, and the results of their operations and their cash flows for each of the
three years in the period ended December 31, 1998, 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 audits. We conducted our
audits 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
audits provide a reasonable basis for the opinion expressed above.



PricewaterhouseCoopers LLP                              R. R. Ross
Chicago, Illinois                                       Engagement Partner
February 6, 1999
<PAGE>
 
- -------------------------------------------------------------------------
Statements of Consolidated Earnings
<TABLE>
<CAPTION>

                                                       Years Ended December 31
                                                   ------------------------------
(in millions, except per share figures)              1998       1997       1996
- ---------------------------------------------------------------------------------
<S>                                                <C>        <C>        <C>
Net Sales                                          $1,573.5   $1,433.7   $1,303.5
Operating costs and expenses
   Cost of products sold                              714.1      629.6      568.6
   Selling, administrative and research expenses      618.0      561.4      518.2
   Cost reduction program                             180.0          -          -
                                                   --------   --------   --------
                                                    1,512.1    1,191.0    1,086.8
                                                   --------   --------   --------
Operating Earnings                                     61.4      242.7      216.7
Interest and other income                               2.4        0.7        2.6
Interest expense                                      (26.5)     (15.3)     (14.4)
Equity in earnings of partnership                      22.6       28.2       24.5
                                                   --------   --------   --------
Earnings from Continuing Operations
   Before Income Taxes                                 59.9      256.3      229.4
Income taxes                                           22.0       92.9       83.5
                                                   --------   --------   --------
Earnings from Continuing Operations                    37.9      163.4      145.9
Earnings from discontinued operations,
   net of taxes                                           -          -        8.6
                                                   --------   --------   --------
Earnings Before Effect of Accounting Change            37.9      163.4      154.5
Cumulative effect of change in accounting for
   business process reengineering costs,
   net of taxes                                           -       (4.5)         -
                                                   --------   --------   --------
Net Earnings                                       $   37.9   $  158.9   $  154.5
                                                   ========   ========   ========

Earnings Per Common Share--Basic
   Earnings from continuing operations             $    .40   $   2.28   $   2.00
   Discontinued operations, net of taxes                  -          -        .13
   Cumulative effect of change in accounting for
      business process reengineering costs,
      net of taxes                                        -       (.07)         -
                                                   --------   --------   --------
   Net earnings                                    $    .40   $   2.21   $   2.13
                                                   ========   ========   ========
Earnings Per Common Share--Diluted
   Earnings from continuing operations             $    .40   $   2.10   $   1.86
   Discontinued operations, net of taxes                  -          -        .11
   Cumulative effect of change in accounting for
      business process reengineering costs,
      net of taxes                                        -       (.06)         -
                                                   --------   --------   --------
   Net earnings                                    $    .40   $   2.04   $   1.97
                                                   ========   ========   ========

Average Shares Outstanding (in thousands)
   Basic                                             65,847     66,700     67,280
                                                   ========   ========   ========

   Diluted                                           66,268     75,265     75,529
                                                   ========   ========   ========
</TABLE>

The notes to consolidated financial statements on pages 27 through 39 are an
integral part of these statements.
<PAGE>

- -------------------------------------------------------------------------------
Statements of Consolidated Financial Condition
<TABLE>
<CAPTION>
                                                                December 31
                                                            -------------------
(in millions, except per share figures)                       1998       1997
- -------------------------------------------------------------------------------
<S>                                                         <C>        <C>
Assets
Current Assets
Cash and cash equivalents                                   $   31.2   $   49.7
Receivables, less allowances
   of $6.1 in 1998 and $4.2 in 1997                            276.7      241.6
Inventories
   Finished products                                            97.4       68.2
   Materials and work in process                                24.4       26.3
                                                            --------   --------
                                                               121.8       94.5
Prepaid expenses, taxes and other current assets                47.9       23.2
                                                            --------   --------
Total Current Assets                                           477.6      409.0
Other Assets
Investment in and advances to partnership                      124.5      122.9
Goodwill, less accumulated amortization
   of $40.5 in 1998 and $29.5 in 1997                          376.3      249.4
Miscellaneous                                                  155.0      167.1
                                                            --------   --------
Total Other Assets                                             655.8      539.4
Net Property, Plant and Equipment                              517.3      492.5
                                                            --------   --------
Total Assets                                                $1,650.7   $1,440.9
                                                            ========   ========


Liabilities and Shareholders' Equity
Current Liabilities
Short-term debt                                             $   75.8   $   22.1
Accounts payable                                               124.9      108.1
Accrued compensation                                            34.0       33.9
Other accrued expenses                                          90.2       57.5
Income taxes                                                    26.4       34.0
                                                            --------   --------
Total Current Liabilities                                      351.3      255.6
Long-Term Debt                                                 496.2      335.3
Deferred Income Taxes                                           15.6       37.2
Accrued Pension Benefits                                        63.2       40.8
Accrued Postretirement Benefits                                123.0      100.7
Other Liabilities                                               15.5       18.6
Commitments and Contingent Liabilities                             -          -

Shareholders' Equity
Preferred stock--par value $1.00 per share                       0.4        0.4
   Capital in excess of par value of shares                    179.1      184.1
   Unearned ESOP compensation                                 (140.5)    (151.1)
                                                            --------   --------
                                                                39.0       33.4
Common stock--par value $.1875 per share;
   80.3 shares issued                                           15.1       15.1
   Capital in excess of par value of shares                     48.0       40.8
Common stock reacquired--at cost                              (449.7)    (420.4)
Retained earnings                                            1,033.2    1,072.7
Accumulated other comprehensive income                         (99.7)     (88.9)
                                                            --------   --------
Total Shareholders' Equity                                     585.9      652.7
                                                            --------   --------
Total Liabilities and Shareholders' Equity                  $1,650.7   $1,440.9
                                                            ========   ========
</TABLE>

The notes to consolidated financial statements on pages 27 through 39 are an
integral part of these statements.
<PAGE>
 
- ----------------------------------------------------------------------------
<TABLE>
<CAPTION>
Statements of Consolidated Cash Flows
                                                        Years Ended December 31
                                                   ---------------------------------
(in millions)                                             1998      1997      1996
- ------------------------------------------------------------------------------------
<S>                                                     <C>        <C>       <C>
Cash Provided by (Used for) Operating Activities
Net earnings                                            $  37.9    $ 158.9   $ 154.5
Adjustments to reconcile net earnings to
   cash provided by operating activities
      Cost reduction program, net of cash payments         75.9          -         -
      Cumulative effect of change in accounting for
         business process reengineering costs                 -        4.5         -
      Depreciation and amortization                       100.6      103.2      98.3
      Equity in earnings of partnership,
         net of distributions                             (12.4)     (17.4)    (14.0)
      Noncurrent deferred income taxes                    (21.3)      (5.0)     (9.0)
      Other--net                                           12.9       11.2       9.1
      Changes in current assets and liabilities
         Receivables                                      (14.7)     (25.2)      6.4
         Inventories                                      (15.5)     (12.1)     (0.1)
         Accounts payable                                  (0.1)       0.7     (15.9)
         Other                                            (34.1)      (5.1)     (0.4)
                                                        -------    -------   -------
Net Cash Provided by Operating Activities                 129.2      213.7     228.9
                                                        -------    -------   -------
Cash Provided by (Used for) Investing Activities
Additions to property, plant and equipment               (115.3)    (101.4)    (92.5)
Business purchases                                       (148.8)     (79.6)    (83.4)
(Investments in) advances from partnership                  7.9       19.1      18.0
Proceeds from sale of business                              1.1          -      41.2
Other investing activities                                  5.1       (4.9)      7.2
                                                        -------    -------   -------
Net Cash (Used for)
   Investing Activities                                  (250.0)    (166.8)   (109.5)
                                                        -------    -------   -------
Cash Provided by (Used for) Financing Activities
Cash dividends, net of taxes                              (77.4)     (78.2)    (78.7)
Proceeds from long-term debt                              166.1      102.8      59.2
Payments of long-term debt                                 (1.2)      (4.2)    (12.1)
Increase (decrease) in short-term debt                     48.8       (3.8)    (69.5)
Common stock reacquired                                   (43.4)     (75.7)    (26.3)
Other financing transactions                                8.7       27.3       9.9
                                                        -------    -------   -------
Net Cash Provided by (Used for) Financing Activities      101.6      (31.8)   (117.5)
Effect of foreign exchange rate changes
   on cash and cash equivalents                             0.7       (4.2)     (1.2)
                                                        -------    -------   -------
Increase (decrease) in cash
   and cash equivalents                                   (18.5)      10.9       0.7
Cash and cash equivalents at the
   beginning of the year                                   49.7       38.8      38.1
                                                        -------    -------   -------
Cash and Cash Equivalents
   at the End of the Year                               $  31.2    $  49.7   $  38.8
                                                        =======    =======   =======
</TABLE>

The notes to consolidated financial statements on pages 27 through 39 are an
integral part of these statements.
<PAGE>
 
- -------------------------------------------------------------------------------
Statements of Consolidated Common Shareholders' Equity
<TABLE>
<CAPTION>
(in millions, except per share figures)
- --------------------------------------------------------------------------------------------------------------------
                                                                                     Common Stock
                                                                Capital in            Reacquired
                                                     Common     Excess of       -----------------------
                                                     Stock      Par Value       Number                     Retained
                                                     Issued     of Shares       of Shares       Cost       Earnings
- --------------------------------------------------------------------------------------------------------------------
<S>                                                 <C>         <C>             <C>            <C>         <C>
Balance at January 1, 1996                           $ 15.1       $ 27.8         13.2          $(350.3)    $  916.2

   Net earnings                                                                                               154.5
   Other comprehensive income:
    Minimum pension liability adjustment
    Currency translation adjustments
      --net of tax of $0.5

   Comprehensive income

   Dividends on preferred stock                                                                               (11.4)
    --net of tax benefit of $3.9
   Dividends on common stock
    ($1.00 per share)                                                                                         (67.3)
   Treasury stock transactions                                                    0.7            (26.3)
   Stock issued under option,
    benefit and other plans                                          3.4         (0.6)            12.4
                                                     ------       ------     --------          -------     --------
Balance at December 31, 1996                           15.1         31.2         13.3           (364.2)       992.0

   Net earnings
   Other comprehensive income:                                                                                158.9
    Minimum pension liability adjustment
      --net of tax benefit of $0.8
    Currency translation adjustments
      --net of tax benefit of $0.1

   Comprehensive income
   Dividends on preferred stock
    --net of tax benefit of $3.5                                                                              (11.5)
   Dividends on common stock
    ($1.00 per share)                                                                                         (66.7)
   Treasury stock transactions                                                    2.0            (75.7)
   Stock issued under option,
    benefit and other plans                                          9.6         (1.0)            19.5
                                                     ------       ------     --------          -------     --------
Balance at December 31, 1997                           15.1         40.8         14.3           (420.4)     1,072.7

   Net earnings
   Other comprehensive income:                                                                                 37.9
    Minimum pension liability adjustment
      --net of tax benefit of $3.2
    Currency translation adjustments

   Comprehensive income

   Dividends on preferred stock
    --net of tax benefit of $3.2                                                                              (11.5)
   Dividends on common stock
    ($1.00 per share)                                                                                         (65.9)
   Treasury stock transactions                                                    1.2            (43.4)
   Stock issued under option,
    benefit and other plans                                          7.2         (0.7)            14.1
                                                     ------       ------     --------          -------     --------
Balance at December 31, 1998                         $ 15.1       $ 48.0         14.8          $(449.7)    $1,033.2
                                                     ======       ======     ========          =======     ========
</TABLE>


<TABLE>
<CAPTION>
(in millions, except per share figures)
- -------------------------------------------------------------------------------------------------------------
                                                                 Accumulated Other
                                                               Comprehensive Income
                                                  ---------------------------------------------
                                                    Minimum Pension        Foreign Currency     Comprehensive
                                                  Liability Adjustment  Translation Adjustments    Income
- -------------------------------------------------------------------------------------------------------------
<S>                                               <C>                   <C>                     <C>
Balance at January 1, 1996                               $ (6.0)              $(48.0)

   Net earnings                                                                                   $  154.5
   Other comprehensive income:
    Minimum pension liability adjustment                   (0.1)                                      (0.1)
    Currency translation adjustments
      --net of tax of $0.5                                                       8.1                   8.1
                                                                                                    ------
   Comprehensive income                                                                             $162.5
                                                                                                    ======
   Dividends on preferred stock
    --net of tax benefit of $3.9
   Dividends on common stock
    ($1.00 per share)
   Treasury stock transactions
   Stock issued under option,
    benefit and other plans

                                                         ------               ------
Balance at December 31, 1996                               (6.1)               (39.9)

   Net earnings                                                                                     $158.9
   Other comprehensive income:
    Minimum pension liability adjustment
      --net of tax benefit of $0.8                         (1.2)                                      (1.2)
    Currency translation adjustments
      --net of tax benefit of $0.1                                             (41.7)                (41.7)
                                                                                                    ------
   Comprehensive income                                                                             $116.0
                                                                                                    ======
   Dividends on preferred stock
    --net of tax benefit of $3.5
   Dividends on common stock
    ($1.00 per share)
   Treasury stock transactions
   Stock issued under option,
    benefit and other plans

                                                         ------               ------
Balance at December 31, 1997                               (7.3)               (81.6)

   Net earnings                                                                                     $ 37.9
   Other comprehensive income:
    Minimum pension liability adjustment
      --net of tax benefit of $3.2                         (5.3)                                      (5.3)
    Currency translation adjustments                                            (5.5)                 (5.5)
                                                                                                    ------
   Comprehensive income                                                                             $ 27.1
                                                                                                    ======
   Dividends on preferred stock
    --net of tax benefit of $3.2
   Dividends on common stock
    ($1.00 per share)
   Treasury stock transactions
   Stock issued under option,
    benefit and other plans

                                                         ------               ------
Balance at December 31, 1998                             $(12.6)              $(87.1)
                                                         ======               ======
</TABLE>

The notes to consolidated financial statements on pages 27 through 39 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, its majority-owned subsidiaries and Nalco-
Chemserve, in which Nalco has a controlling interest. All intercompany balances
and transactions are eliminated. Investments in partnerships are reported on the
equity method.

Certain amounts in the prior years' financial statements and notes thereto have
been reclassified to conform to the current year presentation.

USE OF ESTIMATES--The preparation of financial statements in conformity with
generally accepted accounting principles requires management to make estimates
and assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reporting period. Actual results could differ from those estimates.

CONCENTRATION OF CREDIT RISK--Credit risk represents the accounting loss that
would be recognized at the reporting date if counterparties failed completely to
perform as contracted. Management believes the likelihood of incurring material
losses due to concentration of credit risk is remote. The principal financial
instruments subject to credit risk are as follows:

  Cash and cash equivalents, short-term marketable securities - Nalco has a
  formal policy of placing these instruments in investment grade companies or
  financial institutions and limiting the size of an investment with any single
  entity.

  Receivables - A large number of customers in diverse industries and
  geographies, as well as the practice of establishing reasonable credit lines,
  limits credit risk. The allowances for doubtful accounts are adequate to cover
  potential credit risk losses.

  Foreign exchange contracts and derivatives - The Company has formal policies
  which establish credit limits and investment grade credit criteria of "A" or
  better for all counterparties.

CASH AND CASH EQUIVALENTS--Cash and cash equivalents include all cash balances
and highly liquid investments with original maturities of three months or less.

DERIVATIVES--Gains and losses on hedges of existing assets or liabilities are
included in the carrying amounts of those assets or liabilities and are
ultimately recognized in income as part of those carrying amounts. Gains and
losses related to qualifying hedges of firm commitments also are deferred and
are recognized in income or as adjustments of carrying amounts when the hedged
transaction occurs.

FOREIGN CURRENCY TRANSLATION--The local currency has been designated as the
functional currency in financial statements of companies which account for
approximately 98 percent of total foreign subsidiary net assets at the end of
1998. These financial statements are translated at current and average exchange
rates, with any resulting translation adjustments included in the currency
translation adjustment account in shareholders' equity. The remaining
subsidiaries operate in countries with highly inflationary 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. Foreign currency
exchange losses, included in interest and other income in 1998, 1997 and 1996,
were $1 million, $4 million and $2 million, respectively.

INVENTORY VALUATION--Inventories are valued at the lower of cost or market.
Approximately 73 percent of the inventories at the end of 1998 are valued using
the average cost or first-in, first-out (FIFO) method. The remaining inventories
are valued using the last-in, first-out (LIFO) method. If the FIFO method of
accounting had been used for all inventories, reported

<PAGE>
 
inventory amounts would have been approximately $23 million and $24 million
higher at December 31, 1998 and 1997, respectively.

GOODWILL--Goodwill consists of costs in excess of the fair value of net tangible
and identified intangible assets of acquired companies and is amortized over
periods ranging from 15 years to 40 years using the straight-line method. When
appropriate, the Company evaluates whether the projected earnings and
undiscounted cash flows of each of the acquired companies is sufficient to
recover the carrying value of the net investment, including goodwill, in order
to determine if an impairment has occurred. Management is currently of the
opinion that no such impairment exists.

STOCK-BASED COMPENSATION--The Company recognizes stock-based compensation costs
under the intrinsic value based method of accounting as prescribed by Accounting
Principles Board Opinion No. 25 (APB 25), "Accounting for Stock Issued to
Employees."

INCOME TAXES--Income taxes are recognized during the year in which transactions
enter into the determination of financial statement income, with deferred income
taxes being provided for the tax effect of temporary differences between the
carrying 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 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.

RESEARCH AND DEVELOPMENT--Research and development costs ($43.7 million in 1998,
$43.0 million in 1997, and $41.9 million in 1996) are charged to expense as
incurred.

<PAGE>
 
NOTE 2--BUSINESS SEGMENT 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.

The Company has determined that its reportable segments are those that are based
on the Company's method of internal reporting. Effective January 1, 1998, the
Company established a new sales and marketing organization based on the nature
of the customer served, the product application, or the geographic location of
the customer. This organization is comprised of the following reportable
segments:

INDUSTRIAL DIVISION--Serves the water and waste treatment needs of basic
industry customers in North America, Europe, the Middle East and South Africa.

SPECIALTY DIVISION--Serves the water and waste treatment needs of middle market
customers in North America and Europe.

PULP AND PAPER DIVISION--Serves the process chemical needs of pulp and paper
customers in North America and Europe.

PROCESS DIVISION--Serves the process chemical needs of all industries, except
pulp and paper, worldwide.

LATIN AMERICA DIVISION--Serves the water and waste treatment needs of all
industries and the process chemical needs of the pulp and paper industries in
South and Central America, the Caribbean and Mexico.

PACIFIC DIVISION--Serves the water and waste treatment needs of all industries
and the process chemical needs of the pulp and paper industries in the Pacific
Rim.

The accounting policies of the segments are the same as those described in "Note
1--Summary of Significant Accounting Policies." The Company evaluates the
performance of its segments based on "direct contribution" (net sales, less cost
of products sold, selling and research expenses directly attributable to each
segment). There are no intersegment revenues.

With the exception of net sales for the year ended December 31, 1997, the
Company has not disclosed prior years' segment data on a comparative basis,
because management found it impracticable to obtain the comparative data for
prior years. Prior to 1998, the Company was comprised of one reportable segment.

The following table presents net sales by reportable segment for the years ended
December 31, 1998 and 1997:

<TABLE>
<CAPTION>
(in millions)                  1998            1997
- ---------------------------------------------------
<S>                        <C>             <C>
Industrial                 $  462.5        $  408.8
Specialty                     351.7           301.6
Pulp and Paper                358.4           333.8
Process                       196.6           189.7
Latin America                  85.8            82.7
Pacific                       118.5           117.1
- ---------------------------------------------------
Total                      $1,573.5        $1,433.7
- ---------------------------========================
</TABLE>

The following table presents direct contribution by reportable segment and
reconciles the total segment direct contribution to earnings from continuing
operations before income taxes for the year ended December 31, 1998:

<TABLE>
<CAPTION>
(in millions)                                  1998
- ---------------------------------------------------
<S>                                         <C>
Segment direct contribution:
  Industrial                                $ 115.5
  Specialty                                    82.4
  Pulp and Paper                               85.7
  Process                                      41.7
</TABLE> 

<PAGE>
 
<TABLE>
<S>                                                        <C>
  Latin America                                               16.9
  Pacific                                                     22.8
- ------------------------------------------------------------------
Total segment direct contribution                            365.0
Income (expenses) not allocated to segments:
  Unallocated operating costs and expenses                  (123.6)
  Cost reduction program                                    (180.0)
- ------------------------------------------------------------------
Operating Earnings                                            61.4
Interest and other income                                      2.4
Interest expense                                             (26.5)
Equity in earnings of partnership                             22.6
- ------------------------------------------------------------------
Earnings from Continuing Operations Before Income Taxes    $  59.9
- -----------------------------------------------------------=======
</TABLE>

Asset information by reportable segment has not been reported, since the Company
does not produce such information internally. In addition, although depreciation
expense is a component of each reportable segment's direct contribution, it is
not discretely identifiable.

The following table presents net sales for the United States and all other
countries based on the location of the use of product:

<TABLE>
<CAPTION>
(in millions)                          1998        1997        1996
- -------------------------------------------------------------------
<S>                                <C>         <C>         <C>
United States                      $  900.1    $  792.2    $  705.6
Other                                 673.4       641.5       597.9
- -------------------------------------------------------------------
Total                              $1,573.5    $1,433.7    $1,303.5
- -----------------------------------================================
</TABLE>

The following table presents net property, plant and equipment located in the
United States and all other countries:

<TABLE>
<CAPTION>
(in millions)                          1998        1997        1996
- -------------------------------------------------------------------
<S>                                <C>         <C>         <C>
United States                      $  335.8    $  320.9    $  327.5
Other                                 181.5       171.6       194.5
- -------------------------------------------------------------------
Total                              $  517.3    $  492.5    $  522.0
- -----------------------------------================================
</TABLE>

Net sales and property, plant and equipment were not material in any individual
country other than the United States.

<PAGE>
 
NOTE 3--COST REDUCTION PROGRAM

In the fourth quarter 1998, management approved and began implementing a cost
reduction program to cut its overall cost structure by $30 million annually.
Virtually all of the Company's global operations were affected by this plan,
including sales, marketing, manufacturing and support services. The program
included redesigning, combining and streamlining operations to improve
efficiency and customer focus. Approximately 500 positions were eliminated
during the fourth quarter 1998, mainly as a result of a voluntary enhanced early
retirement program, and an additional 100 positions are scheduled for
elimination in early 1999.

As a result of the cost reduction program, the Company recorded a pretax
provision of $180 million, which included $127 million for pension costs and $19
million for other postretirement benefit costs associated with the early
retirement program. The pension costs resulted in the Company making cash
payments in the fourth quarter 1998 and early 1999 to the Company's principal
U.S. retirement plan and directly to employees for obligations under a
supplementary, non-qualified pension plan. The cost of other postretirement
benefits represents a non-cash charge, which will be paid out in future years.
(See Note 5). Also included in the provision for the cost reduction program were
$21 million for severance and other termination payments; $7 million for legal
and consulting fees, contract termination charges (principally leases), and
other costs related to program; and $6 million for non-cash asset write-offs of
abandoned property and equipment.

Most cost reduction plan activities were completed by the end of 1998 and all
are expected to be concluded by mid-1999. As of December 31, 1998, $127 million
had been charged against the provision for the cost reduction program. The
following talk sets forth the details of activity for 1998:

<TABLE>
<CAPTION>
                                                                     Balance at
                                   1998        Cash      Noncash    December 31,
(in millions)                    Provision   Payments    Charges        1998
- --------------------------------------------------------------------------------
<S>                              <C>         <C>         <C>        <C>
Pension benefits                    $127.6    $ (94.4)    $    -           $33.2
Other postretirement benefits         18.8                 (18.8)              -
Termination benefits                  20.7       (7.4)         -            13.3
Legal, consulting and other            7.4       (2.3)         -             5.1
Asset write-offs                       5.5          -       (4.1)            1.4
- --------------------------------------------------------------------------------
Total                               $180.0    $(104.1)    $(22.9)          $53.0
- ------------------------------------============================================
</TABLE>

Of the remaining balance of $53 million at December 31, 1998, $34 million was
included in the statement of consolidated financial condition in other accrued
expenses and $19 million in accrued pension benefits.

<PAGE>
 
NOTE 4--DISCONTINUED OPERATIONS

In October 1996, the Company completed the sale of its discontinued
superabsorbent chemicals business. The gain on the sale was $3 million, net of
income taxes of $1 million.

The results of the superabsorbent chemicals business have been classified as
discontinued operations in the accompanying financial statements. Sales from the
discontinued operation, which are excluded from consolidated sales, amounted to
$63 million in 1996. Excluding the aforementioned gain on the sale, net earnings
from discontinued operations totaled $6 million in 1996 which included the
pretax operating earnings of the discontinued operations, less applicable income
taxes of $4 million. The effective income tax rate for discontinued operations
differs from the federal statutory rate primarily because of state income taxes,
net of federal tax benefit.

<PAGE>
 
NOTE 5--PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS

The Company has several noncontributory defined benefit pension plans covering
most employees in the United States and those with six foreign subsidiaries. The
principal U.S. plan represents approximately 63 percent of the benefit
obligation and 70 percent of the total market value of plan assets. The Company
also provides a supplementary, non-qualified, unfunded plan for U.S. employees
whose pension benefits exceed ERISA limitations. In addition, the Company has
defined benefit postretirement plans that provide medical, dental and life
insurance benefits for substantially all U.S. retirees and eligible dependents.
The Company retains the right to change or terminate these benefits.

As part of the Company's plan to reduce future operating expenses, a voluntary
enhanced early retirement program was offered in the fourth quarter 1998. (See
Note 3). This program resulted in charges totaling $146 million for special
termination benefits, settlements and curtailments, all of which have been
included in the Company's $180 million charge for the cost reduction program. No
contributions had been made by the Company to its principal U.S. plan during the
period from 1985 to 1997. However, as a result of the early retirement program,
the Company contributed $72 million to the plan in 1998, and expects to
contribute an additional $30 million in 1999. The Company also made payments
totaling $36 million for the settlement of obligations under the supplementary,
non-qualified plan.

The following table details the changes in the funded status of defined benefit
pension and other postretirement benefit plans, and sets forth amounts
recognized and not recognized in the statements of consolidated financial
condition:
<TABLE>
<CAPTION>
 
                                                                                         Pension Benefits     Other Benefits
                                                                                        ------------------  ------------------
(in millions)                                                                             1998      1997      1998      1997
- ------------------------------------------------------------------------------------------------------------------------------
<S>                                                                                     <C>       <C>       <C>       <C>
Change in benefit obligation
Benefit obligation at beginning of year                                                 $ 370.4    $338.3   $  77.8   $  64.9
Service cost                                                                               16.7      15.0       2.3       2.1
Interest cost                                                                              28.2      26.8       5.8       5.5
Participant contributions                                                                   0.7       0.9       0.4       0.3
Plan amendments                                                                             1.2       1.9         -         -
Actuarial loss                                                                            135.9      25.4       5.3       9.0
Benefits paid                                                                             (50.9)    (28.9)     (3.7)     (4.0)
Special termination benefits                                                               59.2         -      22.9         -
Settlements                                                                              (174.7)        -         -         -
Curtailments                                                                              (14.0)        -      (4.1)        -
Foreign currency exchange rate changes                                                      2.2      (9.0)        -         -
- ------------------------------------------------------------------------------------------------------------------------------
Benefit obligation at end of year                                                         374.9     370.4     106.7      77.8
- ------------------------------------------------------------------------------------------------------------------------------
Change in plan assets
Fair value of plan assets at beginning of year                                            340.2     322.8         -         -
Actual return on plan assets                                                               31.8      41.7         -         -
Employer contributions                                                                    119.7       5.7       3.3       3.7
Participant contributions                                                                   0.7       0.9       0.4       0.3
Benefits paid                                                                            (225.6)    (28.9)     (3.7)     (4.0)
Foreign currency exchange rate changes                                                      0.1      (2.0)        -         -
- ------------------------------------------------------------------------------------------------------------------------------
Fair value of plan assets at end of year                                                  266.9     340.2         -         -
- ------------------------------------------------------------------------------------------------------------------------------
Funded status                                                                            (108.0)    (30.2)   (106.7)    (77.8)
Unrecognized net actuarial (gains) losses                                                  69.6      18.0     (20.2)    (26.8)
Unrecognized prior service costs                                                            9.7      16.1         -         -
Unrecognized net transition asset                                                          (8.9)    (16.6)        -         -
- ------------------------------------------------------------------------------------------------------------------------------
Net amount recognized                                                                   $ (37.6)   $(12.7)  $(126.9)  $(104.6)
- --------------------------------------------------------------------------------------========================================
 
Amounts recognized in the statements of consolidated financial condition consist of:
 
                                                                                        Pension Benefits    Other Benefits
                                                                                        ----------------    --------------
(in millions)                                                                              1998      1997      1998      1997
- ------------------------------------------------------------------------------------------------------------------------------
Prepaid benefit cost                                                                    $   2.5    $  8.9   $     -   $     -
Other accrued expenses                                                                        -         -      (3.9)     (3.9)
Accrued benefit liability                                                                 (63.2)    (40.8)   (123.0)   (100.7)
Intangible asset                                                                            2.7       7.3         -         -
Accumulated other comprehensive income                                                     20.4      11.9         -         -
                                                                                        --------------------------------------
Net amount recognized                                                                   $ (37.6)   $(12.7)  $(126.9)  $(104.6)
                                                                                        ======================================
</TABLE>

The projected benefit obligation (PBO), accumulated benefit obligation (ABO) and
fair value of plan assets for defined benefit pension plans with ABOs in excess
of plan assets were $62 million, $52 million and $14 million, respectively, at
December 31, 1998. At December 31, 1997, the PBO and ABO for such plans were $44
million and $35 million, respectively, and none of the plans held assets.

<PAGE>
 
Net pension and other postretirement benefit expense for all defined benefit
plans was comprised of:
<TABLE>
<CAPTION>
 
                                            Pension Benefits           Other Benefits    
                                        -------------------------  -----------------------
(in millions)                            1998     1997     1996     1998     1997     1996
- ------------------------------------------------------------------------------------------
<S>                                     <C>      <C>      <C>      <C>      <C>      <C>
Service cost                            $ 16.7   $ 15.0   $ 16.1    $ 2.3    $ 2.1   $ 2.2
Interest cost                             28.2     26.8     25.6      5.8      5.5     5.1
Expected return on plan assets           (30.1)   (28.6)   (27.7)       -        -       -
Amortization of prior service cost         1.6      2.1      2.1        -        -       -
Amortization of net transition asset      (2.9)    (2.9)    (2.9)       -        -       -
Recognized net actuarial (gain) loss       1.5      1.2      1.7     (1.3)    (1.7)   (1.5)
Special termination benefits              64.2      0.2        -     22.9        -       -
Settlement charge                         61.9        -        -        -        -       -
Curtailment charge (credit)                1.5        -        -     (4.1)       -       -
- ------------------------------------------------------------------------------------------
Net benefit expense                     $142.6   $ 13.8   $ 14.9    $25.6    $ 5.9   $ 5.8
- --------------------------------------====================================================
</TABLE>

As previously noted, the 1998 amounts in the table above include $146 million
for special termination benefits, settlements and curtailments resulting from
the early retirement program offered to employees in the fourth quarter 1998. Of
that amount, $127 million was attributable to pension benefits and $19 million
was attributable to other postretirement benefits. The $146 million charge was
reported as a component of the $180 million cost reduction program expense.

The assumptions used for the U.S. defined benefit plans as of the end of the
last three years were as follows:
<TABLE>
<CAPTION>
 
                                                                      Pension Benefits                       Other Benefits
                                                               -----------------------------        -----------------------------
                                                               1998        1997         1996        1998         1997        1996
                                                               ------------------------------------------------------------------ 
<S>                                                            <C>          <C>          <C>        <C>           <C>         <C>
Discount rates                                                 6.75%        7.5%         8.0%       6.75%         7.5%        8.0%
Rates of increase in compensation levels                        4.0         4.0          4.0         4.0          4.0         4.0
Rates of return on plan assets                                  9.5         9.5          9.5           -            -           -
- ---------------------------------------------------------------------------------------------------------------------------------
 
The assumptions used for the foreign defined benefit
 pension plans as of the end of the last three years
 were as follows:
 
                                                             1998                     1997                     1996
- ---------------------------------------------------------------------------------------------------------------------------------
Discount rates                                            5.0 -  6.5%              6.0 - 7.25%              6.5 -  9.0%      
Rates of increase in compensation levels                  3.0 -  5.0               3.0 -  6.0               4.0 - 6.25
Rates of return on plan assets                            5.5 - 7.25               6.0 - 8.75               6.5 - 9.75
- ---------------------------------------------------------------------------------------------------------------------------------
</TABLE>

The Company has assumed a health care cost trend rate of 6.5% for 1999,
decreasing ratably to 5.0% in 2002 and thereafter. A one-percentage-point change
in assumed health care cost trend rates would have the following effects on 1998
service and interest costs and the accumulated postretirement benefit obligation
at December 31, 1998:
<TABLE>
<CAPTION>
 
                                              One-Percentage-Point
(in millions)                                  Increase  Decrease
- -----------------------------------------------------------------
<S>                                              <C>       <C>
Effect on total of service and interest
  cost components                                $  1.2    $ (1.0)
Effect on postretirement benefit obligation        12.5     (11.2)
- -----------------------------------------------------------------
</TABLE>
<PAGE>
 
NOTE 6--EMPLOYEE STOCK OWNERSHIP PLAN (ESOP)

Nalco's ESOP gives most United States employees an additional opportunity to
share in the ownership of the Company's stock. Preferred shares are allocated to
eligible employees based on a percentage of pretax earnings.

Selected information about the ESOP is as follows:
<TABLE>
<CAPTION>
 
(dollars in millions, shares in thousands)     1998    1997    1996
- --------------------------------------------  ------  ------  ------
<S>                                           <C>     <C>     <C>
Preferred stock dividends                     $ 14.7  $ 15.0  $ 15.3
Interest expense on ESOP debt                 $  7.8  $  8.7  $  9.4
ESOP benefit expense                          $    -  $  4.1  $  3.2
ESOP contribution payments                    $  4.2  $  5.5  $  5.1
Preferred shares at year end:
  Allocated                                    152.4   140.0   124.2
  Committed-to-be-released                      12.2    22.9    24.9
  Suspense                                     208.7   220.9   243.8
- --------------------------------------------  ------  ------  ------
</TABLE>
No provision was recorded for ESOP benefit expense in 1998 because the expected
debt service requirements of the ESOP will not require any contributions by the
Company.
<PAGE>
 
NOTE 7--STOCK OPTION AND PERFORMANCE PLANS

Nalco's Employee Stock Compensation Plan and its 1990 Stock Option Plan for key
management employees authorized the granting of stock options for the purchase
of up to 8,000,000 shares and 6,000,000 shares, respectively, of Nalco common
stock. The Company'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. The option price under these plans
cannot be less than the fair market value on the date of grant. Options granted
since 1989 generally become exercisable ratably over the three years following
the grant date, and will expire ten years after the date granted. Options
granted prior to 1989 had a term of ten years, and were exercisable upon grant.
Options may be exercised in whole or in part for cash, shares of common stock,
or a combination thereof.

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. These options become exercisable upon grant, and
expire ten years from the grant date.

Information regarding these stock option plans for 1998, 1997 and 1996 is as
follows:

<TABLE>
<CAPTION>
                                            1998                            1997                            1996
                               -----------------------------   -----------------------------   -----------------------------
                                            Weighted-Average                Weighted-Average                Weighted-Average
                                 Shares      Exercise Price      Shares      Exercise Price      Shares      Exercise Price
                               -----------------------------   -----------------------------   -----------------------------
<S>                            <C>          <C>                <C>          <C>                <C>          <C>
At the beginning of
    the year                   7,577,371         $33.69        7,473,363        $32.77         6,657,723         $32.17
Granted                        3,513,900         $37.97        1,002,700        $36.48         1,595,200         $31.64
Exercised                       (494,300)        $29.23         (754,492)       $28.17          (500,460)        $20.54
Expired or cancelled            (687,900)        $38.13         (144,200)       $34.04          (279,100)        $34.04
At the end of the year         9,909,071         $35.13        7,577,371        $33.69         7,473,363         $32.77
Options exercisable at
    end of year                6,637,813         $33.67        5,231,142        $33.34         4,574,896         $32.33
Weighted-average fair
    value of options
    granted during
    the year                       $7.94                         $9.02                             $6.53
</TABLE>
 
The following table summarizes information about fixed stock options outstanding
at December 31, 1998:
 
<TABLE>
<CAPTION>
                                      Options Outstanding                          Options Exercisable
                      ---------------------------------------------------    -------------------------------
                                     Weighted-Average
    Range of             Number          Remaining       Weighted-Average       Number      Weighted-Average
 Exercise Prices      Outstanding          Life           Exercise Price     Exercisable     Exercise Price
 ---------------      -----------    ----------------    ----------------    -----------    ----------------
<S>                     <C>          <C>                 <C>                 <C>            <C>
$20.16 to $24.25          298,500        0.4 yrs.             $20.92            298,500          $20.92
$29.56 to $31.97        1,794,050        7.8                  $31.32          1,520,428          $31.25
$32.69 to $35.75        2,705,200        6.0                  $34.46          2,705,200          $34.46
$36.00 to $39.94        5,111,321        7.0                  $37.65          2,113,685          $36.20
                       ----------                                             ---------
$20.16 to $39.94        9,909,071        6.7                  $35.13          6,637,813          $33.67
                       ==========                                             =========
</TABLE>

The Company applies APB 25 and related Interpretations in accounting for the
aforementioned stock plans. Accordingly, no compensation cost has been
recognized for its fixed stock option plans while compensation expense has been
recognized for its compensatory plans. Had compensation cost for the Company's
fixed stock option plans been determined based on the fair value based method,
as defined in Statement of Financial Accounting Standards No. 123 (SFAS 123),
"Accounting for Stock-Based Compensation," the Company's net earnings and
earnings per share would have been reduced to the pro forma amounts indicated
below:

<TABLE>
<CAPTION>
(in millions, except per share data)           1998       1997       1996
- -------------------------------------------------------------------------
<S>                      <C>                  <C>       <C>        <C>
Net earnings             As reported          $37.9     $158.9     $154.5
                         Pro forma             28.9      151.4      146.1
- -------------------------------------------------------------------------
Earnings per share
  Basic                  As reported          $0.40     $ 2.21     $ 2.13
                         Pro forma             0.26       2.10       2.00
  Diluted                As reported           0.40       2.04       1.97
                         Pro forma             0.26       1.94       1.86
- -------------------------------------------------------------------------
</TABLE>

The fair value of each option grant was estimated on the date of the grant using
the Black-Scholes option-pricing model with the following weighted-average
assumptions for 1998, 1997 and 1996, respectively: dividend yield of 2.5
percent, 2.8 percent and 3.2 percent; expected volatility of 16.2 percent, 20.0
percent and 20.7 percent; risk-free interest rate of 5.4 percent, 6.3 percent
and 6.5 percent; and expected lives of 6.3, 6.3 and 6.6 years.

<PAGE>
 
The effects of applying SFAS 123 in the above pro forma disclosures are not
indicative of future amounts as they do not include the effects of awards
granted prior to 1995, some of which would have had income statement effects in
1996 and 1997 due to the three-year vesting period associated with the fixed
stock option awards. Additionally, future amounts are likely to be affected by
the number of grants awarded since additional awards are generally expected to
be made at varying amounts.

In 1996, the Performance Share Plan for designated officers and other key
executives was amended and reapproved by the shareholders. 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 compensatory stock related plans were not significant in
1998 and totaled $3 million in 1997 and $2 million in 1996.

<PAGE>
 
NOTE 8--INCOME TAXES

The sources of earnings from continuing operations before income taxes were as
follows:

<TABLE>
<CAPTION>
(in millions)              1998       1997       1996
- -----------------------------------------------------
<S>                       <C>       <C>        <C>
Domestic                  $14.3     $185.7     $168.6
Foreign                    45.6       70.6       60.8
                          -----     ------     ------
Total                     $59.9     $256.3     $229.4
                          =====     ======     ======
</TABLE>

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

<TABLE>
<CAPTION>
(in millions)              1998      1997      1996
- ----------------------------------------------------
<S>                      <C>        <C>       <C>
Current
  Federal                $ 18.1     $58.2     $50.9
  State                     5.3      11.1      10.4
  Foreign                  21.9      25.6      20.6
                         ------     -----     -----
                           45.3      94.9      81.9
                         ------     -----     -----
Deferred
  Federal                 (18.6)     (3.8)     (3.0)
  State                    (3.1)     (0.6)     (0.1)
  Foreign                  (1.6)      2.4       4.7
                         ------     -----     -----
                          (23.3)     (2.0)      1.6
                         ------     -----     -----
Total                    $ 22.0     $92.9     $83.5
                         ======     =====     =====
</TABLE>

Current foreign taxes listed above include taxes withheld by foreign governments
on distributions from subsidiaries and affiliates (principally dividends and
service fees).

Nalco made income tax payments of $74 million, $103 million and $84 million
during 1998, 1997 and 1996, respectively.

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

<TABLE>
<CAPTION>
                                        1998      1997      1996
- -----------------------------------------------------------------
<S>                                     <C>       <C>       <C>
Statutory U.S. federal tax rate         35.0%     35.0%     35.0%
State income taxes, net
  of federal tax benefit                 2.7       2.6       2.9
Other                                   (1.0)     (1.4)     (1.5)
                                        ----      ----      ----
Effective tax rate                      36.7%     36.2%     36.4%
                                        ====      ====      ====
</TABLE>

Details of the 1998 and 1997 deferred tax assets and liabilities are as follows:

<TABLE>
<CAPTION>
(in millions)                                   1998          1997
- ------------------------------------------------------------------
<S>                                          <C>           <C>
Deferred tax assets:
  Postretirement benefits                    $ (51.5)       $(42.5)
  Pension benefits                             (20.4)         (3.6)
  Other                                        (48.8)        (42.5)
                                             -------       -------
  Total                                       (120.7)        (88.6)
                                             -------       -------
Deferred tax liabilities:
  Depreciation                                  60.6          57.9
  Leveraged lease investments                   28.6          29.2
  Other                                         29.5          26.5
                                             -------       -------
  Total                                        118.7         113.6
                                             -------       -------
Net deferred tax (asset) liability           $  (2.0)       $ 25.0
                                             =======       =======
Included in:
  Prepaid expenses, taxes
     and other current assets                $  (7.8)       $ (6.2)
  Miscellaneous other assets                    (7.9)         (5.8)
  Income taxes                                  (1.9)         (0.2)
  Deferred income taxes                         15.6          37.2
                                             -------       -------
Net deferred tax (asset) liability           $  (2.0)       $ 25.0
                                             =======       =======
</TABLE>

<PAGE>
 
NOTE 9--EARNINGS PER SHARE

Basic earnings per share (EPS) is computed by dividing net earnings (after
deducting preferred stock dividends, net of income taxes) by the weighted-
average number of common shares outstanding during the year. Diluted EPS is
based upon the weighted-average number of common shares and dilutive potential
common shares outstanding, 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 diluted EPS 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. At December 31, 1998, there were 373,195 shares of
preferred stock outstanding which were convertible to approximately 7.5 million
common shares. The preferred stock was not included in the computation of
diluted EPS for 1998 since it would have resulted in an antidilutive effect.

The following table reconciles the numerators and denominators of the basic and
diluted EPS computations for earnings from continuing operations:

<TABLE>
<CAPTION>
(dollars in millions, shares in thousands)                1998         1997         1996
- ----------------------------------------------------------------------------------------
<S>                                                    <C>          <C>          <C>
Earnings from continuing operations                    $  37.9      $ 163.4      $ 145.9
Dividends on preferred stock, net of taxes               (11.5)       (11.5)       (11.3)
- ----------------------------------------------------------------------------------------
Earnings from continuing operations available
  to common shareholders used in basic EPS                26.4        151.9        134.6
Assumed conversion of preferred stock                        -         11.5         11.3
Additional ESOP expense resulting from assumed
  conversion of preferred stock, net of taxes                -         (4.5)        (4.5)
Income tax adjustment on assumed common dividends            -         (1.0)        (0.9)
- ----------------------------------------------------------------------------------------
Earnings from continuing operations available to
  common shareholders used in diluted EPS              $  26.4      $ 157.9      $ 140.5
- -------------------------------------------------------=================================

Average shares outstanding used in basic EPS            65,847       66,700       67,280
Effect of dilutive securities:
  Assumed conversion of preferred stock                      -        7,760        7,930
  Stock options and contingently
     issuable shares                                       421          805          319
- ----------------------------------------------------------------------------------------

Average shares outstanding used in diluted EPS          66,268       75,265       75,529
- -------------------------------------------------------=================================
</TABLE>

The following options to purchase shares of common stock were outstanding during
each year, but were not included in the computation of diluted EPS because the
exercise price was greater than the average market price:

<TABLE>
<CAPTION>
                                                     1998      1997        1996
- -------------------------------------------------------------------------------
<S>                                                <C>         <C>       <C>
Number of options (thousands)                       5,357         -       3,139
Weighted-average exercise price                    $37.56      $  -      $35.52
- -------------------------------------------------------------------------------
</TABLE>

<PAGE>
 
NOTE 10 -- ACCOUNTING CHANGE

In November 1997, the Emerging Issues Task Force of the Financial Accounting
Standards Board reached a consensus on Issue 97-13 (EITF 97-13), "Accounting for
Costs Incurred in Connection with a Consulting Contract or an Internal Project
That Combines Business Process Reengineering and Information Technology
Transformation." The consensus clarified the accounting for third-party and
internally generated costs associated with projects that combine business
process reengineering activities and information technology transformation,
requiring that such costs be expensed as incurred. Additionally, the transition
provisions of EITF 97-13 required any unamortized previously capitalized costs
for business process reengineering activities to be written off in the quarter
that contained November 20, 1997 and to be reported as a cumulative effect of a
change in accounting principle.

As a result of EITF 97-13, the Company recorded a noncash pretax charge of $7
million ($4.5 million after tax, or 6 cents per share on a diluted basis) in
1997, which was comprised of unamortized capitalized business process
reengineering costs.

<PAGE>
 
NOTE 11--ACQUISITIONS

The Company acquired seventeen businesses in 1998, eight businesses in 1997 and
two businesses in 1996 that operate in Nalco's core markets of water treatment
and process chemicals. Each of the acquisitions was accounted for as a purchase
and, accordingly, the operating results of each acquired business was included
in the consolidated financial results of the Company from its respective
acquisition date. In addition, during 1998 the Company increased its investments
in Taiwan Nalco Chemical Co. Ltd. from 79 percent to 82 percent and Nalco
Chemical India, Ltd. from 65 percent to 80 percent. During 1997 the Company
increased its investment in Taiwan Nalco Chemical Co. from 55 percent to 79
percent. The combined purchase price of these acquisitions, net of cash
acquired, was approximately $149 million in 1998, $80 million in 1997 and $83
million in 1996. On a preliminary basis, the purchase price exceeded the fair
value of the net tangible assets of those businesses which were acquired during
1998 by about $132 million which was allocated to goodwill and other intangible
assets. The Company does not anticipate that the final purchase allocations will
differ significantly from the preliminary purchase price allocations recorded.
The purchase price exceeded the fair value of the net tangible assets which were
acquired during 1997 and 1996 by $70 million and $75 million, respectively.

Effective January 1998, the Company merged its South African affiliate company
with the water treatment interests of Chemical Services Limited, South Africa's
largest specialty chemicals company, to form Nalco-Chemserve. In connection with
the merger, Nalco obtained a controlling interest in Nalco-Chemserve and,
accordingly, has consolidated the results of Nalco-Chemserve from January 1,
1998.

The pro forma impact as if these acquisitions had occurred at the beginning of
the respective years is not significant.

<PAGE>
 
NOTE 12--INVESTMENT IN AND ADVANCES TO PARTNERSHIP

The Company's investment in partnership consists of its 60 percent interest in
Nalco/Exxon, a joint venture partnership which was formed in 1994.

The Company's investment in Nalco/Exxon of $125 million at December 31, 1998
included $45 million in demand notes payable to Nalco/Exxon. There were $35
million of demand notes payable to Nalco/Exxon at December 31, 1997.

All significant management decisions of the joint venture require agreement by
both the Company and Exxon. In addition, certain provisions of the joint venture
agreement provide Exxon with an option to cause Nalco/Exxon to redeem a portion
of the Company's interest in Nalco/Exxon such that subsequent to such
redemption, the Company and Exxon shall share equally in the results of the
joint venture. As a result of the Company not exercising control over
Nalco/Exxon, its investment in the joint venture is accounted for by the equity
method.

The following table summarizes the Company's equity in earnings of Nalco/Exxon
and distributions from the partnership for the years 1998, 1997 and 1996:

<TABLE>
<CAPTION>
(in millions)                                   1998       1997       1996
- --------------------------------------------------------------------------
<S>                                           <C>        <C>        <C>
Nalco/Exxon:
  Net sales                                   $487.8     $455.6     $436.6
  Earnings before income taxes                  42.7       51.1       42.4
  Net income                                    34.6       42.6       35.7
Nalco's equity interest                           60%        60%        60%
                                              ------     ------     ------
Nalco's equity in net income                    20.8       25.6       21.4
Amortization and income preference, net          1.8        2.6        3.1
                                              ------     ------     ------
Equity in earnings of partnership             $ 22.6     $ 28.2     $ 24.5
                                              ======     ======     ======
Distributions received from partnership       $ 10.2     $  9.2     $  8.4
                                              ======     ======     ======
</TABLE>

In the fourth quarter 1998, Nalco/Exxon began implementing a cost reduction
program which included provisions for employee terminations and impaired assets.
The Company's equity portion of Nalco/Exxon's cost reduction program was over $2
million.

The Company's investment in Nalco/Exxon at December 31, 1998 included $7 million
for the net excess of the Company's investment over its equity in the joint
venture's net assets which is being amortized to equity earnings over the life
of the related assets. In addition, the Company received a 2 percent, 4 percent
and 6 percent earnings preference in 1998, 1997 and 1996, respectively, which
has been included in equity earnings.

Condensed balance sheet information for the Nalco/Exxon joint venture at
December 31, 1998 and 1997 was as follows:

<TABLE>
<CAPTION>
(in millions)                                 1998        1997
- --------------------------------------------------------------
<S>                                         <C>         <C>
Current assets                              $154.9      $164.7
Noncurrent assets                            223.3       203.8
Current liabilities                           83.2        89.9
Noncurrent liabilities                        31.5        33.7
- --------------------------------------------------------------
</TABLE>

The Company has an agreement with Nalco/Exxon to provide certain administrative
services to the partnership. Fees earned by the Company in 1998, 1997 and 1996
were $14 million, $14 million and $15 million, respectively.

In the normal course of business, the Company supplies Nalco/Exxon with certain
products, and purchases certain products from Nalco/Exxon. These transactions
are generally at cost and were not significant in 1998, 1997 or 1996.

<PAGE>
 
NOTE 13--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)                                     1998          1997
- ---------------------------------------------------------------------
<S>                                           <C>           <C>
Land                                          $   35.5      $   34.8
Buildings                                        208.7         199.4
Equipment                                        980.9         901.0
                                              --------      --------
                                               1,225.1       1,135.2
Allowances for depreciation                     (707.8)       (642.7)
                                              --------      --------
Net property, plant and equipment             $  517.3      $  492.5
                                              ========      ========
</TABLE>

<PAGE>
 
NOTE 14--SHORT-TERM DEBT

Short-term debt consists of the following:

<TABLE>
<CAPTION>
(in millions)                                    1998       1997
- ----------------------------------------------------------------
<S>                                             <C>        <C>
Notes payable                                   $10.8      $18.9
Current maturities of long-term debt              5.0        3.2
Commercial paper borrowings                      60.0          -
                                                -----      -----
Total                                           $75.8      $22.1
                                                =====      =====
</TABLE>

The weighted-average interest rate on short-term debt was 5.8 percent and 9.1
percent at December 31, 1998 and 1997, respectively.

For general purposes and to support the ESOP loans and the issuance of
commercial paper, Nalco has a $350 million Revolving Credit Agreement with
eleven banks. This agreement is structured as a four-year revolving credit.
Borrowings under the agreement are at rates which, at Nalco's option, vary with
the prime rate, CD rate, LIBOR or money market rates. The credit line carries a
facility fee of .08 percent. The credit arrangements were unused at December 31,
1998.

<PAGE>
 
NOTE 15--LONG-TERM DEBT

Long-term debt consists of the following:

<TABLE>
<CAPTION>
(in millions)                           1998        1997
- --------------------------------------------------------
<S>                                   <C>         <C>
ESOP loans                            $140.5      $151.1
Commercial paper borrowings            148.0       143.0
Unsecured notes, due 2008              149.5           -
Other                                   63.2        44.4
                                      ------      ------
                                       501.2       338.5
Less current portion                    (5.0)       (3.2)
                                      ------      ------
Total                                 $496.2      $335.3
                                      ======      ======
</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 20-year period ending December 31, 2008 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. At December 31, 1998, $88 million of the ESOP 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 notional value
of the swap agreement decreased to $43 million in 1998 with final maturity in
1999. The remaining borrowings are comprised of a $38 million variable rate loan
which matures in 2008 and a $15 million loan with a fixed rate of 8.1 percent
and a final maturity in the year 2000. The weighted-average interest rate of all
ESOP loans was 6.1 percent at December 31, 1998.

Commercial paper borrowings of $148 million and $143 million at December 31,
1998 and 1997, respectively, were classified as long-term based on the Company's
intent to refinance these borrowings on a long-term basis. Interest rates on the
commercial paper outstanding at December 31, 1998 ranged from 4.8 percent to 5.2
percent with a weighted-average rate of 5.0 percent.

In May 1998, the Company issued $150 million of 6.25% unsecured notes under a
shelf registration statement filed with the Securities and Exchange Commission
in April 1998. The notes mature in May 2008. Notes up to $250 million remain
available under the shelf registration statement.

The $63 million in other long-term debt includes $36 million owed by a foreign
subsidiary at a variable interest rate (an effective rate of 5.1% at December
31, 1998). The remaining $27 million was borrowed by various foreign
subsidiaries at interest rates ranging from 3.6 percent to 21.2 percent with a
weighted-average rate of 8.5 percent.

Interest paid by Nalco was $25 million, $14 million and $14 million in 1998,
1997 and 1996, respectively.

The following table presents the projected annual maturities of long-term debt
for the next five years after 1998:

(in millions)
- -----------------------
1999              $ 5.0
2000               10.4
2001                 -
2002                 -
2003                 -
- -----------------------

The amounts above include approximately $15 million in maturities related to the
ESOP loans.

<PAGE>
 
NOTE 16--SHAREHOLDERS' EQUITY

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

<TABLE>
<CAPTION>
(dollars in millions, except per share amounts)        1998      1997
- ---------------------------------------------------------------------
<S>                                                   <C>       <C>
Preferred stock, par value $1.00 per share;
  authorized 2,000,000 shares;
     Series B ESOP Convertible
       Preferred Stock--outstanding;
       373,195 shares-1998 and 383,774
       shares-1997                                    $ 0.4     $ 0.4
     Series C 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
- ---------------------------------------------------------------------
</TABLE>

There were 14,758,440 shares and 14,251,003 shares held in treasury at December
31, 1998 and 1997, respectively.

In 1996, Nalco's Board of Directors authorized the repurchase of up to 3 million
shares of the Company's common stock. During 1998, the repurchase of those
shares was completed and the Board of Directors authorized the repurchase of an
additional 3 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 C Junior Participating Preferred 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 $481.00 per share, and may be required to be redeemed by
Nalco under certain circumstances. During 1998, 10,579 preferred shares were
converted to 213,484 common shares of Nalco stock. During 1997 and 1996, 9,077
and 6,572 preferred shares were converted to 182,417 and 132,179 common shares,
respectively. Approximately 8,000,000 common shares have been reserved for the
conversion of preferred stock.

In 1996, the Board of Directors approved a Shareholder Rights Plan and declared
a dividend distribution of one Preferred Share Purchase Right (Right) for each
outstanding share of common stock. The Rights are not exercisable or
transferable 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 or 50 percent or
more of Nalco's assets or earning power are sold, each Right other than that
held by the acquiring party will entitle the holder to receive, upon exercise at
a price of $125, subject to adjustment, common stock of either Nalco or the
acquiring company having a value equal to two times that price. The Rights are
redeemable at $.01 each at any time before a 15 percent or greater position has
been acquired, and expire on August 31, 2006. In connection with the
distribution of the 1996 Rights, the Company's Series A Junior Participating
Preferred Stock was cancelled and its Series C Junior Participating Preferred
Stock was authorized.

<PAGE>
 
NOTE 17--FINANCIAL INSTRUMENTS AND RISK MANAGEMENT

Nalco has limited involvement with derivative financial instruments and does not
trade them. The Company does use derivatives to fix the cost of issuing debt and
to manage well-defined interest rate and foreign exchange exposures.

Notional Amounts and Credit Exposures of Derivatives

  The notional amounts of derivatives summarized below do not represent amounts
  exchanged by the parties and, thus, are not a measure of the exposure of the
  Company through its use of derivatives. The amounts exchanged are calculated
  on the basis of the notional amounts and the other terms of the derivatives,
  which relate primarily to interest rates and foreign exchange rates.

  The Company is exposed to credit-related losses in the event of nonperformance
  by counterparties to financial instruments, but it does not expect any
  counterparties to fail to meet their obligations given their high credit
  ratings.

Interest Rate Risk Management

  Interest rate swap agreements are used to reduce the potential impact of
  increases in interest rates on floating rate long-term debt. The Company was a
  counterparty to one interest rate swap with a notional value of $43 million at
  December 31, 1998, and $51 million at December 31, 1997. This swap fixes
  interest payments on a corresponding amount of floating rate ESOP notes at 7.3
  percent until February 1999. The average interest rate received on this
  interest rate swap was 4.6 percent in both 1998 and 1997.

Foreign Exchange Risk Management

  The Company enters into various types of foreign exchange contracts in
  managing its intercompany foreign exchange risk, including currency swaps,
  forward exchange contracts and option contracts.

  The Company's currency swap agreements were designed to hedge foreign currency
  intercompany loans that have maturities up to seven years. Gains and losses
  related to these swaps are offset with gains and losses on the underlying
  foreign currency loans. Forward exchange and option contracts are used to
  hedge various intercompany transactions with foreign subsidiaries and selected
  net asset exposures. These contracts usually have maturities of six months,
  but occasionally may have maturities of up to eighteen months.

  The Company had foreign exchange contracts with notional values of $51 million
  and $64 million at December 31, 1998 and 1997, respectively.

  Deferred realized and unrealized gains and losses from firm foreign currency
  commitments, based on dealer-quoted prices, are included in the statements of
  consolidated financial condition as either miscellaneous other assets or
  accounts payable. They are recognized in earnings as part of the underlying
  transaction when it is recognized. There was no net deferred realized and
  unrealized gain or loss at December 31, 1998 or December 31, 1997.

<PAGE>
 
NOTE 18--FAIR VALUE OF FINANCIAL INSTRUMENTS

The following table presents the carrying amounts and fair values of the
Company's financial instruments at December 31, 1998 and 1997:

<TABLE>
<CAPTION>
                                          1998                  1997
                                   ----------------------------------------
                                   Carrying      Fair    Carrying      Fair
(in millions)                       Amount      Value     Amount      Value
- ---------------------------------------------------------------------------
<S>                                <C>         <C>       <C>         <C>
Nonderivatives:
  Cash and cash equivalents          $ 31.2    $ 31.2      $ 49.7    $ 49.7
  Short-term debt                      75.8      75.8        22.1      22.1
  Long-term debt                      496.2     502.8       335.3     336.0
Derivatives:
  Miscellaneous other assets            3.8       1.6         7.0       4.6
- ---------------------------------------------------------------------------
</TABLE>

The following methods and assumptions were used to estimate the fair values of
financial instruments:
 
  Cash and cash equivalents - The carrying amount approximates fair value
  because of the short-term maturities of such instruments.

  Short-term debt - The carrying amount approximates fair value because of the
  short-term maturities of such instruments.

  Long-term debt - The carrying amount of term borrowings at variable interest
  rates approximates fair value. The fair value of the Company's fixed-rate ESOP
  borrowings 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 6.25% fixed-rate notes was based on the quoted
  market price.

  Derivatives - The fair value of derivatives, including currency swaps, foreign
  currency forward exchange and option contracts, and interest rate swaps was
  estimated based on current settlement prices, quoted market prices of
  comparable contracts, and pricing models or formulas using current
  assumptions.

<PAGE>
 
NOTE 19--CONTINGENCIES AND LITIGATION

Nalco has been named as a potentially responsible party (PRP) by the
Environmental Protection Agency (EPA) or state enforcement agencies at 14 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 remediate 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 made and will
continue to make provisions for these costs if the Company's liability becomes
probable and when costs can be reasonably estimated. As of December 31, 1998,
the Company had undiscounted reserves of approximately $1 million for the
maximum amount of known environmental clean-up costs. The Company's 1998
expenditures relating to environmental compliance and clean-up activities were
not significant. These environmental reserves represent management's current
estimate of its proportional clean-up costs and are based upon negotiation and
agreement with enforcement agencies, its previous experience with respect to
clean-up activities, a detailed review by the Company of known conditions, and
information about other PRPs. They are not reduced by any possible recoveries
from insurance companies or other PRPs not specifically identified. Although
management cannot determine whether or not a material effect on future
operations is reasonably likely to occur, given the evolving nature of
environmental regulations, it believes that the recorded reserve levels are
appropriate estimates of the potential liability. Although settlement will
require future cash outlays, it is not expected that such outlays will
materially impact the Company's liquidity position.

It is the Company's policy to accrue for estimated post-closure and site
remediation costs when the decision has been made by management to close a
facility.

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>
 
Quarterly Summary (Unaudited)

<TABLE>
<CAPTION>

                                                       1998                                               1997
                                  ----------------------------------------------      -------------------------------------------
(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                             $   367.1    $   403.0    $ 408.4    $   395.0      $ 334.6    $ 354.4    $   371.0    $  373.7

Gross earnings                        202.2        221.8      221.7        213.7        189.8      201.8        206.0       206.5

Earnings (loss) before
  accounting change                    38.0         42.0       40.7        (82.8)*       35.8       40.1         44.2        43.3

Cumulative effect of
  accounting change                       -            -          -            -            -          -            -        (4.5)

Net earnings (loss)                    38.0         42.0       40.7        (82.8)*       35.8       40.1         44.2        38.8

Per common share

   Earnings (loss) - basic
      Before accounting change          .53          .59        .58        (1.31)         .49        .56          .62         .61
      Accounting change                   -            -          -            -            -          -            -        (.07)
      Net earnings (loss)               .53          .59        .58        (1.31)         .49        .56          .62         .54

   Earnings (loss) - diluted
      Before accounting change          .49          .55        .54        (1.31)         .46        .51          .57         .56
      Accounting change                   -            -          -            -            -          -            -        (.06)
      Net earnings (loss)               .49          .55        .54        (1.31)         .46        .51          .57         .50

   Dividends                            .25          .25        .25          .25          .25        .25          .25         .25

   Market price
      High                         40 15/16     40 15/16     36 3/8       34 3/8       38 7/8         40     41 13/16     42 7/16
      Low                            36 3/4       34 1/8     27 3/8     27 11/16       35 1/8     34 1/4      38 5/16      37 1/2
- ---------------------------------------------------------------------------------------------------------------------------------
</TABLE>

* Includes after tax charges of $117.0 million for cost reduction program
  expenses recognized by the Company and Nalco/Exxon.


<PAGE>
 
                                                                    EXHIBIT (23)
 
                       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 33-57363,
33-53111, 2-97721, 33-9934 and 2-97721) and Form S-8 (Numbers 333-06955, 333-
06963, 33-54377, 33-38033, 33-38032, 33-29149, 2-97721, 2-97131 and 2-82642) of
our report dated February 6, 1999, which appears on page 42 of the 1998 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, 1998. We also consent to the incorporation by reference of
our report on the Financial Statement Schedule, which appears on page 12 of
this Form 10-K. We also consent to the incorporation by reference in the
Registration Statement of our report dated March 26, 1999 appearing on page 1
of the Annual Report of the Nalco Chemical Company Profit Sharing, Investment
and Pay Deferral Plan on Form 11-K for the year ended December 31, 1998.
 
PricewaterhouseCoopers LLP
 
Chicago, Illinois
March 30, 1999

<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549


                                   FORM 11-K

(Mark One)

[X]  Annual Report pursuant to Section 15(d) of the Securities Exchange Act of
     1934

For the Fiscal year ended December 31, 1998

                                       OR

[ ]  Transition report pursuant to section 15(d) of the Securities Exchange Act
     of 1934

For the Transition period from __________________ to _________________

Commission file number 1-4957


                          PROFIT SHARING, INVESTMENT
                             AND PAY DEFERRAL PLAN
                           OF NALCO CHEMICAL COMPANY

                            NALCO CHEMICAL COMPANY
                               One Nalco Center
                       Naperville, Illinois  60563-1198

              (Issuer and address of principal executive offices)
<PAGE>
 
                             NALCO CHEMICAL COMPANY
                           PROFIT SHARING, INVESTMENT
                             AND PAY DEFERRAL PLAN
                             ---------------------

                              FINANCIAL STATEMENTS
                                 AND SCHEDULES
                                 -------------

                          DECEMBER 31, 1998 and 1997
                          --------------------------
<PAGE>
 
                            NALCO CHEMICAL COMPANY
               PROFIT SHARING, INVESTMENT AND PAY DEFERRAL PLAN
               ------------------------------------------------
                                        
                             FINANCIAL STATEMENTS
                                 AND SCHEDULES
                                 -------------
                                        

                                     INDEX
                                     -----


<TABLE>
<CAPTION>
                                                                                       Page(s)
                                                                                     -----------    
<S>                                                                                  <C>
Report of Independent Accountants                                                          1

Statements of Net Assets Available for Plan Benefits                                       2

Statements of Changes in Net Assets Available for Plan Benefits                            3

Notes to Financial Statements                                                            4-13


Supplementary Schedules:

Item 27a--Schedule of Assets Held for Investment Purposes at December 31, 1998       Schedule I

Item 27d--Schedule of Reportable Transactions for the Year Ended December 31, 1998   Schedule II
</TABLE>

Note:  All other schedules have been omitted because they are not applicable

<PAGE>
 
                       Report of Independent Accountants
                       ---------------------------------

March 26, 1999

To the Employee Benefit Plan
Administration Committee of
Nalco Chemical Company:


In our opinion, the accompanying statements of net assets available for plan
benefits and the related statements of changes in net assets available for plan
benefits present fairly, in all material respects, the net assets available for
benefits of the Nalco Chemical Company Profit Sharing, Investment and Pay
Deferral Plan at December 31, 1998 and 1997, and the changes in net assets
available for benefits for the years then ended, in conformity with generally
accepted accounting principles. These financial statements are the
responsibility of the plan's management; our responsibility is to express an
opinion on these financial statements based on our audits. We conducted our
audits of these statements in accordance with generally accepted auditing
standards which require that we plan and perform the audits 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
audits provide a reasonable basis for the opinion expressed above.

Our audits were made for the purpose of forming an opinion on the basic
financial statements taken as a whole. The additional information included in
the supplementary schedules is presented for purposes of additional analysis and
is not a required part of the basic financial statements but is additional
information required by ERISA. Such information has been subjected to the
auditing procedures applied in the audits of the basic financial statements and,
in our opinion, is fairly stated in all material respects in relation to the
basic financial statements taken as a whole.


                                                  PricewaterhouseCoopers LLP

                                       1
<PAGE>
 
                            NALCO CHEMICAL COMPANY
               PROFIT SHARING, INVESTMENT AND PAY DEFERRAL PLAN
               ------------------------------------------------
                                        
             STATEMENTS OF NET ASSETS AVAILABLE FOR PLAN BENEFITS
             ----------------------------------------------------
                                        
                       AS OF DECEMBER 31, 1998 and 1997
                       --------------------------------


<TABLE>
<CAPTION>
                                                                 1998                   1997
                                                        ----------------------  ---------------------
Investments, at fair value:
<S>                                                     <C>                     <C>
  Nalco Chemical Company common stock                             $ 75,104,971           $ 98,123,822
 
  Mutual funds                                                      82,272,901             98,974,383
 
  Group annuity contract deposits                                   36,944,097             50,965,924

  Bank commingled investment funds                                  63,761,859             41,540,862

  Collective short-term investment funds                            26,512,592             10,500,682
                                                                  ------------           ------------
                                                                   284,596,420            300,105,673

Loans receivable from participants                                   5,417,307              5,604,934

Due from Nalco Chemical Company Employee Stock
 Ownership Plan                                                      3,795,959                 89,410
 
Accrued income receivable                                              153,686                246,199
                                                                  ------------           ------------
Net assets available for plan benefits                            $293,963,372           $306,046,216
                                                                  ============           ============
</TABLE>

                  The accompanying notes are an integral part
                         of these financial statements.

                                       2
<PAGE>
 
                             NALCO CHEMICAL COMPANY
                PROFIT SHARING, INVESTMENT AND PAY DEFERRAL PLAN
                                        
        STATEMENTS OF CHANGES IN NET ASSETS AVAILABLE FOR PLAN BENEFITS
                                        
                 FOR THE YEARS ENDED DECEMBER 31, 1998 and 1997


<TABLE>
<CAPTION>
                                                                     1998                     1997
                                                                  ------------            ------------
<S>                                                               <C>                     <C>
Sources of net assets:
  Contributions by employees                                      $ 17,325,559            $ 14,403,378
  Dividend income                                                    3,429,577               3,774,078
  Interest income                                                    4,208,514               4,492,750
  Transfers from Nalco Chemical Company
   Employee Stock Ownership Plan                                     5,077,002                 934,736
  Participant loan repayments                                        3,164,231               3,000,833
  Net (depreciation)/appreciation of investments                    (3,799,826)             30,169,423
                                                                  ------------            ------------
Total sources of net assets                                         29,405,057              56,775,198
Applications of net assets:
  Administrative expenses                                              (36,661)                (71,324)
  Participant loans                                                 (2,817,529)             (2,954,444)
  Withdrawals by participants                                      (38,633,711)            (32,809,447)
                                                                  ------------            ------------
(Decrease)/Increase in net assets available for plan
 benefits                                                          (12,082,844)             20,939,983
Net assets available for plan benefits at beginning
 of period                                                         306,046,216             285,106,233
                                                                  ------------            ------------
Net assets available for plan benefits at end of period           $293,963,372            $306,046,216
                                                                  ============            ============
</TABLE>


                  The accompanying notes are an integral part
                         of these financial statements.

                                       3
<PAGE>
 
                             NALCO CHEMICAL COMPANY
                PROFIT SHARING, INVESTMENT AND PAY DEFERRAL PLAN

                         NOTES TO FINANCIAL  STATEMENTS
                                        
                           DECEMBER 31, 1998 and 1997


NOTE 1 - DESCRIPTION OF THE PLAN:

The Nalco Chemical Company Profit Sharing, Investment and Pay Deferral Plan (the
Plan) is a voluntary contribution, individual account plan, which covers
substantially all Nalco Chemical Company (the Company) employees.  No service
requirement exists before an employee is eligible to participate in the Plan.
Pursuant to section 6 of the Plan document, profit sharing contributions are at
the discretion of the Company.  The Company has not contributed to the Plan
since January 1, 1990.  The Plan also accepts transfers of Company common stock
and cash from the Employee Stock Ownership Plan for retirees.

The Plan includes eight investment alternatives: the Nalco Stock Fund, the U.S.
Government Money Market Fund, the Stable Capital Fund, the Bond Index Fund, the
Balanced Fund, the Growth and Income Fund, the EuroPacific Fund, and the Equity
Index Fund. A participant who has attained the age of 50 can transfer once per
calendar year a minimum of 10% of his balance from the Nalco Stock Fund to any
of the other funds in the Plan. The maximum allowable transfer is determined by
the Employee Benefit Plan Administration Committee (EBPAC). Participants
electing to make tax-deferred contributions through cash or salary deductions
have the option of investing these contributions in a combination of any of the
funds. Participants can transfer assets acquired with their contributions at
their discretion.

A participant can also make contributions which are not tax-deferred through
payroll deductions or a lump-sum investment.  All participant contributions vest
immediately, and participants are entitled to their entire account balance upon
retirement, termination, disability, or death as a lump-sum payment (or in semi-
annual stock installments for shares in the Nalco Stock Fund).

Participants are allowed to borrow from the Plan, provided the amount does not
exceed the lesser of one-half the vested Plan balance of the participant, or
$50,000. The length of the loan is decided by the employee, subject to certain
governmental restrictions, and the interest charged is determined by EBPAC and
communicated to the participants in writing.

                                       4
<PAGE>
 
At December 31, 1998, employees participating in the Plan had invested in the
available funds as follows (some have investments in more that one fund):

<TABLE>
<CAPTION>
                                                     1998             1997
                                                     ----             ---- 
<S>                                                  <C>              <C>
Total employees participating                        3,123            3,175
                                                                    
     Nalco Stock Fund                                2,232            2,410

     U.S. Government Money Market Fund                 252              236
                                                                    
     Stable Capital Fund                             1,227            1,443
                                                                    
     Bond Index Fund                                   512              403

     Balanced Fund                                   1,141            1,135

     Growth and Income Fund                          2,019            2,236
                                                                    
     Equity Index Fund                               1,884            1,723

     EuroPacific Fund                                  861              950
</TABLE>

The Company believes that the Plan will continue without interruption, but
reserves the right to terminate the Plan at any time.  In the event of
termination of the Plan, the Nalco Chemical Company Profit Sharing, Investment
and Pay Deferral Plan Trust (the Trust) will continue until all of the funds
held by The Northern Trust Company (the Trustee) have been distributed to the
participants or their beneficiaries.  Such distribution will be made in
accordance with the provisions of the plan document in effect on the date of its
termination.


NOTE 2 - SIGNIFICANT ACCOUNTING POLICIES:
- -----------------------------------------

Basis of Accounting
- -------------------

The financial statements of the Plan are prepared on the accrual basis of
accounting, except for benefit payments to former participants which are
recorded when paid as noted below.

Use of Estimates
- ----------------

The preparation of financial statements in conformity with generally accepted
accounting principles requires the use of certain estimates and assumptions that
affect the reported amounts of assets and liabilities and the disclosure of
contingent assets and liabilities and the periods in which certain items of
revenue and expense are included.  Actual results may differ from such
estimates.

Withdrawals by Participants
- ---------------------------

Withdrawals by participants include benefit payments and transfers out of the
plan.

                                       5
<PAGE>
 
Valuation of Investments
- ------------------------

All investments, except for group annuity contract deposits, are valued by the
Trustee based on the closing market value on the last business day of the plan
year.  The group annuity contract deposits are stated at estimated fair value,
which represents contributions made under the contracts at original cost plus
interest at the contract rate.  The insurance companies are contractually liable
for the contract value provided the investment remains with the insurance
company.

Amounts Due Participants
- ------------------------

In accordance with ERISA requirements for reporting by employee benefit plans,
benefit payments to former participants are recorded when paid.  Accordingly, at
December 31, 1998 and 1997, the following amounts have been allocated to the
individual accounts of withdrawing participants, but not recorded as liabilities
on the Statements of Net Assets Available for Plan Benefits or withdrawals by
participants in the Statements of Changes in Net Assets Available for Plan
Benefits:

<TABLE>
<CAPTION>
                                                  1998               1997
                                                  ----               ----
 <S>                                          <C>                  <C>
 Nalco Stock Fund                             $ 2,921,359          $244,098
                                                              
 U.S. Government Money Market Fund                406,770             ---
                                                              
 Stable Capital Fund                            3,542,950           267,323
                                                              
 Bond Index Fund                                1,001,777             ---
                                                              
 Balanced Fund                                  1,238,192             5,193
                                                              
 Growth and Income Fund                         2,362,312           155,336
                                                              
 Equity Index Fund                              3,478,265            25,192
                                                              
 EuroPacific Fund                               1,254,898            30,375
                                              -----------          --------
                                              $16,206,523          $727,517
                                              ===========          ========
</TABLE>

The preceding accounting treatment results in a difference between these
financial statements and the Form 5500 as these amounts have been recorded as
liabilities as of December 31, 1998 and 1997, and have been included in the
benefits paid for the respective years on the Form 5500.

                                       6
<PAGE>
 
NOTE 3 - INVESTMENTS:
- ---------------------

The cost of investments and number of shares or units held at December 31, 1998 
and 1997 were as follows:

<TABLE>
<CAPTION>
                                                                    1998                           1997
                                                      --------------------------------------------------------------
                                                        Shares or Units      Cost      Shares or Units      Cost
                                                      --------------------------------------------------------------
<S>                                                     <C>              <C>           <C>              <C>
Nalco Chemical Company Common Stock                         2,422,741    $ 39,900,109      2,480,223    $ 37,146,056

American Balanced Fund                                      1,139,171      16,815,917      1,139,119      16,371,281

American EuroPacific Fund                                     363,485       9,468,874        456,076      11,570,309

Dreyfus Government Money Market Instruments                 3,735,295       3,735,295      2,676,600       2,676,600

Hartford Annuity Contract Deposit                              ----            ----        2,563,076       2,563,076

Life of Georgia Contract Deposit                               ----            ----        6,282,171       6,282,171

Pacific Mutual Contract Deposit                             3,358,097       3,358,097      3,149,032       3,149,032

Provident Contract Deposit                                     ----            ----        3,723,764       3,723,764

Sun Life America Contract Deposit                              ----            ----        2,191,985       2,191,985

Allamerica Group Annuity Contract Deposit                   2,443,220       2,443,220      4,522,389       4,522,389

Ohio National Group Annuity Contract Deposit                3,180,910       3,180,910      2,979,775       2,979,775

Protective Life Group Annuity Contract Deposit                 ----            ----        2,892,390       2,892,390

Chase Bank Group Annuity Contract Deposit                   2,011,812       2,011,812         ----            ----

J.P. Morgan Group Annuity Contract Deposit                 10,000,000      10,000,000     10,000,000      10,000,000

New York Life Group Annuity Contract Deposit                5,892,661       5,892,661      5,553,351       5,553,351

Union Bank of Switzerland Group Annuity Contract            
  Deposit                                                   2,021,363       2,021,363         ----            ----  

Principal Mutual Group Annuity Contract Deposit             4,632,360       4,632,360      5,581,170       5,581,170

Transamerica Group Annuity Contract Deposit                 1,622,541       1,622,541      1,526,821       1,526,821

Union Bank of Switzerland Group Annuity Contract                                      
  Deposit                                                   1,781,133       1,781,133         ----            ----
                                                                                      
Neuberger & Berman Guardian Fund                            2,241,807      51,243,797      2,570,243      58,104,493

Barclays Equity Index Fund                                  1,677,253      37,609,255      1,437,519      26,606,279

Barclays Government/Corporate Bond Index Fund                 503,477       6,881,435        294,949       3,553,220

The Northern Trust Company Collective Short-Term                                      
  Investment Fund                                          26,512,592      26,512,592     10,500,682      10,500,682
                                                                         ------------                   ------------ 
                    Total                                                $229,111,371                   $217,494,844
                                                                         ============                   ============
</TABLE>

                                       7
<PAGE>
 
Individual investments that represent 5% or more of the fair value of net assets
available for plan benefits at December 31, 1998 are as follows:

<TABLE>
<CAPTION>
                                                           Shares or Units     Cost         Fair Value
                                                         -----------------------------------------------
<S>                                                        <C>              <C>             <C>
Nalco Chemical Company Common Stock                           2,422,741     $39,900,109     $75,104,971

Barclays Equity Index Fund                                    1,677,253      37,609,255      56,355,707

Neuberger & Berman Guardian Fund                              2,241,807      51,243,797      50,261,302

Northern Trust Collective Short-Term Investment Funds        26,512,592      26,512,592      26,512,592

American Balanced Fund                                        1,139,171      16,815,917      17,953,331
</TABLE>


NOTE 4 - TRANSACTIONS WITH RELATED PARTY:
- -----------------------------------------

Certain expenses pertaining to the operation of the Plan are paid by the Company
and are not charged against the assets or income of the Plan.  In addition,
various administrative, legal, and accounting services are performed by Company
personnel on behalf of the Plan.  No charges are made to the Plan for these
services.


NOTE 5 - INCOME TAX STATUS:
- ---------------------------

The Internal Revenue Service issued a letter of determination dated July 17,
1995 stating the Plan is qualified under section 401(a) of the Internal Revenue
Code (the Code) and is, therefore, exempt from federal income taxation under
section 501(a) of the Code. Participants are not subject to federal income tax
until amounts are distributed to them.

                                       8
<PAGE>
 
NOTE 6 - GROUP ANNUITY CONTRACTS:
- ---------------------------------

The fair value of group annuity contract deposits at December 31, 1998 and 1997
was comprised of the following:

<TABLE>
<CAPTION>
                                                                                                December 31,
                                                                                             1998         1997
                                                                                          -----------  -----------
<S>                                                                                       <C>          <C>
Chase Bank contract deposit, #401039, due 10/15/2006 (5.83% in 1998)                      $ 2,011,812         ----
Hartford contract deposit, GA10156, due 12/21/1998 (4.87% in 1997)                               ----  $ 2,563,076
Life of Georgia contract deposit, FR101, due 9/9/1999 (5.93% in 1997)                            ----    6,282,171
Pacific Mutual contract deposit, G-2608401, due 6/1/1998 (6.65% in 1998 and 1997)           3,358,097    3,149,032
Provident contract deposit, #627-0569-201A, due 6/1/1999 (6.21% in 1997)                         ----    3,723,764
Sun Life America contract deposit, #4656, due 7/25/1998 (6.58% in 1997)                          ----    2,191,985
Allamerica contract deposit, GA-91636A, due 2/25/2001 (8.05% in 1998 and 1997)              2,443,220    4,522,389
Ohio National contract deposit, #5708, due 12/1/1997 (6.75% in 1998 and 1997)               3,180,910    2,979,775
Protective Life contract deposit, GA1191, due 6/1/1998 (5.85% in 1997)                           ----    2,892,390
J.P. Morgan contract deposit, NALCO-01, due 6/1/2000 (3.93% in 1998 and 5.50%              10,000,000   10,000,000
  in 1997)
New York Life contract deposit, #30481, due 6/30/1999 (6.11% in 1998 and 1997)              5,892,661    5,553,351
Union Bank of Switzerland contract deposit, #2462, due 3/15/2008 (5.89% in 1998)            2,021,363         ----
Union Bank of Switzerland contract deposit, #2437 (6.15% in 1998)                           1,781,133         ----
Transamerica Life contract deposit, S1393-00, due 1/30/1998 (6.13% in 1997)                      ----    1,526,821
Transamerica Life contract deposit, #76772-00, due 7/15/2002 (6.08% in 1998)                1,622,541         ----
Principal Mutual contract deposit, #4-23183, due 12/31/2000 (6.41% in 1998 and 1997)        4,632,360    5,581,170
                                                                                          -----------  -----------
                                                                                          $36,944,097  $50,965,924
                                                                                          ===========  ===========
</TABLE>

Average yields for the above contracts are not calculated as the rates are
guaranteed.  No valuation reserve was established in 1998 or 1997 as the
companies listed all maintain at least an A+ credit rating.

                                       9
<PAGE>
 
NOTE 7 - STATEMENTS OF NET ASSETS:
- ----------------------------------

The statements of net assets available for plan benefits by fund as of December
31, 1998 and 1997 are as follows:

                            NALCO CHEMICAL COMPANY
                            ----------------------
               PROFIT SHARING, INVESTMENT AND PAY DEFERRAL PLAN
               ------------------------------------------------
          STATEMENT OF NET ASSETS AVAILABLE FOR PLAN BENEFITS BY FUND
          -----------------------------------------------------------
                            AS OF DECEMBER 31, 1998
                            -----------------------
                                        
<TABLE>
<CAPTION>
                                               U.S. Govt
                                 Nalco Stock   Money Mkt  Stable Capital   Bond Index    Balanced
                                    Fund         Fund          Fund            Fund        Fund
                                 -----------  ----------  --------------   ---------- -------------
<S>                                      <C>         <C>             <C>     <C>           <C>
Investments, at fair value:

Nalco Chemical Company
 common stock                    $74,698,933

Mutual funds                                  $3,735,295                                $17,953,331

Group annuity contract
 deposits                                                    $36,944,097

Bank commingled mutual
 funds                                                                     $7,406,152

Collective short-term
 investment fund                   1,967,849          19      24,362,769            6            60
                                 -----------  ----------     -----------   ----------   -----------

                                  76,666,782   3,735,314      61,306,866    7,406,158    17,953,391

Loans receivable from
 participants

Due from Nalco Chemical
 Company Employee Stock
 Ownership Plan                    3,795,959

Accrued income receivable              8,372      12,208         131,400
                                 -----------  ----------     -----------   ----------   -----------

Net assets available for
 plan benefits                   $80,471,113  $3,747,522     $61,438,266   $7,406,158   $17,953,391
                                 ===========  ==========     ===========   ==========   ===========

</TABLE>

<TABLE>
<CAPTION>

                                Growth &      Equity Index  EuroPacific    Loan     Clearing
                               Income Fund        Fund        Fund        Account    Account        Total
                               -------------  -----------  -----------  ---------  -----------  ------------
<S>                             <C>         <C>           <C>         <C>         <C>           <C>
Investments, at fair value:

Nalco Chemical Company
 common stock                                                                         $406,038  $ 75,104,971

Mutual funds                      $50,261,302                $10,322,973                          82,272,901

Group annuity contract
 deposits                                                                                         36,944,097

Bank commingled mutual
 funds                                          $56,355,707                                       63,761,859

Collective short-term
 investment fund                          258           140           98               181,393    26,512,592
                                  -----------   -----------  -----------  ----------  --------  ------------
                                   50,261,560    56,355,847   10,323,071               587,431   284,596,420
Loans receivable from
 participants                                                             $5,417,307               5,417,307

Due from Nalco Chemical
 Company Employee Stock
 Ownership Plan                                                                                    3,795,959

Accrued income receivable                   1             1                              1,704       153,686
                                  -----------   -----------  -----------  ----------  --------  ------------
Net assets available for
 plan benefits                    $50,261,561   $56,355,848  $10,323,071  $5,417,307  $589,135  $293,963,372
                                  ===========   ===========  ===========  ==========  ========  ============
</TABLE>
<PAGE>
 
                            NALCO CHEMICAL COMPANY
                            ----------------------
               PROFIT SHARING, INVESTMENT AND PAY DEFERRAL PLAN
               ------------------------------------------------
          STATEMENT OF NET ASSETS AVAILABLE FOR PLAN BENEFITS BY FUND
          -----------------------------------------------------------
                            AS OF DECEMBER 31, 1997
                            -----------------------
                                        
<TABLE>
<CAPTION>

                                           U.S. Govt
                             Nalco Stock   Money Mkt    Stable Capital  Bond Index      Balanced
                                Fund          Fund            Fund         Fund           Fund
                             -----------   ----------   --------------  ----------    -----------
<S>                           <C>          <C>         <C>             <C>           <C>
Investments, at fair value:

Nalco Chemical Company
 common stock                 $98,123,822

Mutual Funds                               $2,676,600                                $17,861,388

Group annuity contract
 deposits                                                 $50,965,924

Bank commingled mutual
 funds                                                                  $3,964,109

Collective short-term
 investment fund                1,548,151                   8,793,071                            
                              -----------  ----------     -----------   -----------  -----------

                               99,671,973   2,676,600      59,758,995    3,964,109    17,861,388

Loans receivable from
 participants

Due from Nalco Chemical
 Company Employee
 Stock Ownership Plan              89,410                                   

Accrued income receivable          11,133      11,130         222,764  
                              -----------  ----------     -----------   ---------     -----------
Net assets available for
 plan benefits                $99,772,516  $2,687,730     $59,981,759   $3,964,109   $17,861,388
                              ===========  ==========     ===========   ==========   ===========

</TABLE>
<TABLE>
<CAPTION>

                               Growth &    Equity Index  EuroPacific    Loan         Clearing
                             Income Fund      Fund         Fund        Account       Account         Total
                             -----------  ------------  -----------  ------------   ---------      ---------
<S>                          <C>          <C>           <C>          <C>           <C>            <C>

Investments, at fair value:

Nalco Chemical Company                                                                            $ 98,123,822
 common stock
                             $66,569,298                  $11,867,097                               98,974,383
Mutual Funds

Group annuity contract                                                                              50,965,924
 deposits

Bank commingled mutual                       $37,576,753                                            41,540,862
 funds

Collective short-term
 investment fund                                                                      $159,460      10,500,682
                             -----------     -----------  -----------  ----------     --------      ----------
                                                                                        
                              66,569,298      37,576,753   11,867,097                  159,460     300,105,673

Loans receivable from                                                  $5,604,934                    5,604,934
 participants

Due from Nalco Chemical
 Company Employee
 Stock Ownership Plan                                                                                   89,410

Accrued income receivable                                                                1,172         246,199
                             -----------     -----------  -----------  ----------     --------     -----------

Net assets available for
 plan benefits               $66,569,298     $37,576,753  $11,867,097  $5,604,934     $160,632    $306,046,216
                             ===========    ============  ===========  ==========     ========    ============

</TABLE>

                                      12
<PAGE>
 
NOTE 8 - STATEMENTS OF CHANGES IN NET ASSETS:
- ---------------------------------------------

The statements of changes in net assets available for plan benefits by fund for
the years ended  December 31, 1998 and 1997 are as follows:

                            NALCO CHEMICAL COMPANY
                            ----------------------
               PROFIT SHARING, INVESTMENT AND PAY DEFERRAL PLAN
               ------------------------------------------------
    STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR PLAN BENEFITS BY FUND
    ----------------------------------------------------------------------
                     FOR THE YEAR ENDED DECEMBER 31, 1998
                     ------------------------------------
                                        
<TABLE>
<CAPTION>
                                                      U.S. Govt
                                      Nalco Stock     Money Mkt     Stable Capital       Bond Index  Balanced
                                         Fund           Fund             Fund               Fund       Fund
                                     -------------  ------------   ---------------      ----------- ------------
<S>                                   <C>            <C>           <C>                   <C>          <C>
Sources of net assets:

Contributions by employees              $  666,434      $230,784       $1,570,134      $  343,829   $ 1,456,081

Dividend income                          2,317,710                                                      641,462

Interest income                             84,931       159,560        3,464,421               6            60

Transfers from Nalco Chemical
 Company Employee Stock
 Ownership Plan                          5,077,002

Participant loan repayments                300,782        42,228          696,019          56,158       264,756

Net transfers authorized by
 Participants                            1,531,117     2,362,533        6,953,308       3,408,608    (1,585,343)

Net realized/unrealized
 Appreciation (depreciation) of 
  investments                          (19,208,377)                                       449,168     1,239,363
                                      ------------     ---------        ---------      ----------    ----------

 Total sources of net assets            (9,230,401)    2,795,105       12,683,882       4,257,769     2,016,379

Applications of net assets:

 Administrative expenses


 Loans to participants                    (265,316)      (70,520)       (653,718)         (85,903)     (209,479)

 Withdrawals by participants            (9,805,686)   (1,664,793)    (10,573,657)        (729,817)   (1,714,897)
                                      ------------    -----------    ------------      ----------   -----------


Increase (decrease) in net assets
 available for plan benefits           (19,301,403)    1,059,792        1,456,507       3,442,049        92,003

Net assets available for plan
 benefits at beginning of period        99,772,516     2,687,730       59,981,759       3,964,109    17,861,388
                                      ------------   -----------     ------------      ----------   -----------

Net assets available for plan
 benefits at end of period            $ 80,471,113   $ 3,747,522     $ 61,438,266      $7,406,158   $17,953,391
                                      ============   ===========     ============      ==========   ===========
</TABLE>
<TABLE>
<CAPTION>


                                       Growth &     Equity Index   EuroPacific      Loan        Clearing
                                      Income Fund       Fund           Fund        Account      Account         Total
                                      -------------  -------------  ------------  -----------  ------------  -----------
<S>                                   <C>             <C>           <C>           <C>          <C>           <C>
Sources of net assets:

Contributions by employees            $  4,991,481    $ 4,264,730   $ 1,046,285                $ 2,755,801   $ 17,325,559

Dividend income                            327,015                      140,419                      2,971      3,429,577

Interest income                                260            141            98   $  481,831        17,206      4,208,514

Transfers from Nalco Chemical
 Company Employee Stock
 Ownership Plan                                                                                                 5,077,002

Participant loan repayments                946,033        628,373       188,647                     41,235      3,164,231

Net transfers authorized by
 Participants                          (17,381,895)     7,611,540    (2,899,868)                                        0

Net realized/unrealized
 Appreciation of investments               926,877     11,462,110     1,332,169                     (1,136)    (3,799,826)
                                      ------------    -----------   -----------   ----------   -----------   ------------

 Total sources of net assets           (10,190,229)    23,966,894      (192,250)     481,831     2,816,077     29,405,057

Applications of net assets:

 Administrative expenses                                                                           (36,661)       (36,661)


 Loans to participants                    (770,324)      (588,593)     (126,675)                   (47,001)    (2,817,529)

 Withdrawals by participants            (5,347,184)    (4,599,206)   (1,225,101)    (669,458)   (2,303,912)   (38,633,711)
                                      ------------    -----------   -----------   ----------   -----------   ------------


Increase (decrease) in net assets
 available for plan benefits           (16,307,737)    18,779,095    (1,544,026)    (187,627)      428,503    (12,082,844)

Net assets available for plan
 benefits at beginning of period        66,569,298     37,576,753    11,867,097    5,604,934       160,632    306,046,216
                                      ------------    -----------   -----------   ----------   -----------   ------------

Net assets available for plan
 benefits at end of period            $ 50,261,561    $56,355,848   $10,323,071   $5,417,307   $   589,135   $293,963,372
                                      ============    ===========   ===========   ==========   ===========   ============
</TABLE>
                                      14
<PAGE>

                             NALCO CHEMICAL COMPANY
                             ----------------------
                PROFIT SHARING, INVESTMENT AND PAY DEFERRAL PLAN
                ------------------------------------------------
     STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR PLAN BENEFITS BY FUND
     ----------------------------------------------------------------------
                      FOR THE YEAR ENDED DECEMBER 31, 1997
                      ------------------------------------
<TABLE>
<CAPTION>
                                           U.S. Govt
                            Nalco Stock    Money Mkt   Stable Capital   Bond Index     Balanced     Growth &
                                Fund         Fund           Fund           Fund          Fund      Income Fund
                                ----         ----           ----           ----          ----      -----------
<S>                         <C>           <C>          <C>              <C>          <C>           <C>
Sources of net assets:

Contributions by
  employees                 $   685,190   $   146,442   $  1,983,419    $  210,068   $ 1,267,695   $ 5,085,028

Dividend income               2,636,406                                                  548,267       394,153

Interest income                  70,793       113,949      3,832,273

Transfers from Nalco
  Chemical Company
  Employee Stock
  Ownership Plan                934,736

Participant loan
  repayments                    314,074        36,515        751,828        25,393       232,327       962,815

Net transfers
  authorized by
  participants               (8,883,795)    1,977,860     (4,764,197)      871,764     1,854,982     2,339,787

Net realized/unrealized
  appreciation of
  investments                 9,435,900                                    263,048     2,331,498     9,336,785
                            -----------   -----------   ------------    ----------   -----------   -----------
 Total sources of net
  assets                      5,193,304     2,274,766      1,803,323     1,370,273     6,234,769    18,118,568

Applications of net
  assets:

  Administrative expenses

  Loans to participants        (325,059)      (79,929)      (680,636)      (34,575)     (242,850)   (1,032,061)

  Withdrawals by
    participants             (9,181,013)   (1,427,545)   (10,243,931)     (271,173)   (1,193,170)   (6,124,036)
                            -----------   -----------   ------------    ----------   -----------   -----------
Increase (decrease) in
   net assets available
   for plan benefits         (4,312,768)      767,292     (9,121,244)    1,064,525     4,798,749    10,962,471

Net assets available
  for plan benefits at
  beginning of period        104,085,284    1,920,438     69,103,003     2,899,584    13,062,639    55,606,827
                            ------------  -----------   ------------    ----------   -----------   -----------
Net assets available
  for plan benefits at
  end of period             $ 99,772,516  $ 2,687,730   $ 59,981,759    $3,964,109   $17,861,388   $66,569,298
                            ============  ===========   ============    ==========   ===========   ===========
</TABLE>

<TABLE>
<CAPTION>

                               Equity Index     EuroPacific         Loan         Clearing
                                   Fund            Fund           Account         Account         Total
                                   ----            ----           -------         -------         -----
<S>                            <C>              <C>              <C>             <C>           <C>
Sources of net assets:

Contributions by
  employees                    $ 3,077,632      $ 1,221,567                      $ 726,337     $ 14,403,378

Dividend income                                     194,558                            694        3,774,078

Interest income                                                  $  459,017         16,718        4,492,750

Transfers from Nalco
  Chemical Company
  Employee Stock
  Ownership Plan                                                                                    934,736

Participant loan
  repayments                       460,623          188,787                         28,471        3,000,833

Net transfers
  authorized by
  participants                   6,310,004          293,698                           (103)               0

Net realized/unrealized
  appreciation of
  investments                    8,112,811          688,912                            469       30,169,423
                               -----------      -----------      ----------      ---------     ------------
 Total sources of net
  assets                        17,961,070        2,587,522         459,017        772,586       56,775,198

Applications of net
  assets:

  Administrative expenses                                                          (71,324)         (71,324)

  Loans to participants           (449,899)        (190,632)                        81,197       (2,954,444)

  Withdrawals by
    participants                (2,416,924)        (789,133)       (126,621)    (1,035,901)     (32,809,447)
                               -----------      -----------      ----------      ---------     ------------
Increase (decrease) in
   net assets available
   for plan benefits            15,094,247        1,607,757         332,396       (253,442)      20,939,983

Net assets available
  for plan benefits at
  beginning of period           22,482,506       10,259,340       5,272,538        414,074      285,106,233
                               -----------      -----------      ----------      ---------     ------------
Net assets available
  for plan benefits at
  end of period                $37,576,753      $11,867,097      $5,604,934      $ 160,632     $306,046,216
                               ===========      ===========      ==========      =========     ============
</TABLE>

                                      16

<PAGE>
 
                                                                      SCHEDULE I
                                                                      ----------
                             NALCO CHEMICAL COMPANY
                             ----------------------
                PROFIT SHARING, INVESTMENT AND PAY DEFERRAL PLAN
                ------------------------------------------------
                            ITEM 27A--SCHEDULE OF                           
                            ---------------------       
                      ASSETS HELD FOR INVESTMENT PURPOSES
                      -----------------------------------
                            AS OF DECEMBER 31, 1998
                            -----------------------

<TABLE>
<CAPTION>
Identity of Issuer                                             Description of Investment                  Fair Value       Cost
- -----------------------------------------------  ------------------------------------------------------  ------------  ------------
<S>                                              <C>                                                     <C>           <C>
*Nalco Chemical Company                          2,422,741  shares of common stock                       $ 75,104,971  $ 39,900,109

Chase Bank                                       Group annuity contract deposit, #401039, 5.83%,            2,011,812     2,011,812
                                                    due 10/15/2006

Union Bank of Switzerland                        Group annuity contract deposit, #2462, 5.89%, due          2,021,363     2,021,363
                                                    3/15/2008

Pacific Mutual                                   Group annuity contract deposit, G-2608401, 6.65%,          3,358,097     3,358,097
                                                    due 6/1/1998

Union Bank of Switzerland                        Group annuity contract  deposit, #2437,  6.15%,            1,781,133     1,781,133

Allamerica                                       Group annuity contract deposit, GA-91636A, 8.05%, due      2,443,220     2,443,221
                                                    2/25/2001

Ohio National                                    Group annuity contract deposit, #5708, 6.75%, due          3,180,910     3,180,910
                                                    12/1/1997

J.P. Morgan                                      Group annuity contract deposit, NALCO-01, 3.93%, due      10,000,000    10,000,000
                                                    6/1/2000

New York Life                                    Group annuity contract deposit, #30481, 6.11%, due         5,892,661     5,892,661
                                                    6/30/1999

Principal Mutual                                 Group annuity contract deposit, #4-23183, 6.41%, due       4,632,360     4,632,360
                                                    12/31/2000

Transamerica Life                                Group annuity contract deposit, #76772-00, 6.08%, due      1,622,541     1,622,541
                                                    7/15/2002

American                                         American EuroPacific Growth Fund - 363,485 shares         10,322,973     9,468,874

                                                 American Balanced Fund - 1,139,171 shares                 17,953,331    16,815,917

Dreyfus                                          U.S. Government Money Market Fund                          3,735,295     3,735,295

Neuberger & Berman                               Guardian Fund - 2,241,807 shares                          50,261,302    51,243,797

Barclays Global Investors                        Barclays Equity Index Fund - 1,677,253 shares             56,355,707    37,609,255

                                                 Barclays Bond Index Fund -  503,477 shares                 7,406,152     6,881,435

*The Northern Trust Company                      Collective Short-Term Investment Fund                     26,512,592    26,512,592

*Participant loans                               Participant loans, average interest rate of 9.27%          5,417,307     5,417,307
                                                                                                         ------------  ------------
 .                                                                                                        $290,013,727  $234,528,679
                                                                                                         ============  ============

*Party-in-interest to the Plan
</TABLE>
<PAGE>
 
                                                                     SCHEDULE II
                                                                     -----------
                             NALCO CHEMICAL COMPANY
                             ----------------------
                PROFIT SHARING, INVESTMENT AND PAY DEFERRAL PLAN
                ------------------------------------------------
                 ITEM 27D--SCHEDULE OF REPORTABLE TRANSACTIONS
                 ---------------------------------------------
                      FOR THE YEAR ENDED DECEMBER 31, 1998
                      ------------------------------------


<TABLE>
<CAPTION>
                                                                                                                                    
                                                                                      Expenses              Value of
                                                                                      Incurred     Cost     Asset on
                                                                                        With        of     Transaction    Net Gain
Identity of Party Involved    Description of Asset    Purchase Price  Selling Price  Transaction   Asset     Date        (Loss)
- --------------------------    --------------------    --------------  -------------  -----------  -------    ----       ---------
                                                                                                            
                                                                                                  
Category (iii) - A series of security transactions 
- --------------------------------------------------
 in excess of 5% of the current value of plan assets:
 ----------------------------------------------------
 <S>                                                   <C>               <C>                  <C>          <C>          <C>
 
Neuberger & Berman Management    Neuberger & Berman 
                                 Guardian Equity Fund:

                                      84 purchases       14,202,384                             14,202,384   14,202,384
 
                                      172 sales                          23,923,988             21,065,580   23,923,988   2,858,408
 
 
The Northern Trust Company       Collective Short-Term  
                                 Investment Fund:
 
                                      350 purchases     120,659,457                            120,659,457  120,659,457
 
                                      401 sales                          97,958,848             97,958,848   97,958,848
 
 
Barclays Global Investors        Barclays Equity Index Fund:
 
                                      163 purchases      21,245,791                             21,245,791   21,245,791
 
                                      97 sales                           13,928,946             10,242,815   13,928,946   3,686,131
 
 
  
There were no reportable category (i), (ii), or (iv) transactions for the year ended December 31, 1998.
</TABLE>
<PAGE>
 
                                  SIGNATURES
                                        
       
     Pursuant to the requirements of the Securities Exchange Act of 1934, the
trustees (or other persons who administer the employee benefit plan) have duly
caused this annual report to be signed on its behalf by the undersigned hereunto
duly authorized.


                                              PROFIT SHARING, PAY DEFERRAL
                                                   AND INVESTMENT PLAN OF
                                                  NALCO CHEMICAL COMPANY

                                         BY /s/ J.F. LAMBE 
                                            -----------------------------
                                            Member, Employee Benefit Plan
                                            Administration Committee


Dated:   March 30, 1999


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