TETRA TECH INC
424B3, 1999-03-24
ENGINEERING SERVICES
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<PAGE>


                               TETRA TECH, INC.

                        920,354 SHARES OF COMMON STOCK

                              -------------------

     The stockholders of Tetra Tech, Inc. listed herein are offering and selling
920,354 shares of Common Stock of Tetra Tech, Inc. under this prospectus.

                              -------------------


         INVESTING IN TETRA TECH, INC. COMMON STOCK INVOLVES RISKS.
                   SEE "RISK FACTORS" BEGINNING ON PAGE 2.

                              -------------------

     All of the selling stockholders obtained or will obtain their shares of 
Common Stock in exchange for their Exchangeable Shares of Tetra Tech Canada 
Ltd., a subsidiary of Tetra Tech, Inc.  The selling stockholders received their 
Exchangeable Shares on September 22, 1998 in connection with Tetra Tech, Inc.'s 
acquisition of the Sentrex Group of Companies.  Some or all of the selling 
stockholders expect to sell their shares.

     The selling stockholders may offer their shares of Common Stock through 
public or private transactions, on or off the Nasdaq National Market, at 
prevailing market prices, or at privately negotiated prices.

                              -------------------

     Tetra Tech, Inc. Common Stock is traded on the Nasdaq National Market 
under the symbol "WATR."  On March 18, 1999 the closing price of the Common 
Stock on the Nasdaq National Market was $18.00 per share.

                              -------------------

THE SECURITIES AND EXCHANGE COMMISSION AND STATE SECURITIES REGULATORS HAVE NOT
APPROVED OR DISAPPROVED THESE SECURITIES, OR DETERMINED IF THIS PROSPECTUS IS
TRUTHFUL OR COMPLETE.  ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

                              -------------------

              THE DATE OF THIS PROSPECTUS IS MARCH 18, 1999

<PAGE>

                                  THE COMPANY

     Tetra Tech, Inc. is a leading provider of specialized management 
consulting and technical services in three principal business areas: resource 
management, infrastructure and communications.  As a specialized management 
consultant, we assist our clients in defining problems and developing 
innovative and cost-effective solutions.  Our management consulting services 
are complemented by our technical services.  These technical services, which 
implement solutions, include research and development, applied science, 
engineering and architectural design, construction management, and operations 
and maintenance.  Our clients include a diverse base of public and private 
organizations located in the United States and internationally.

     Since our initial public offering in December 1991, we have increased the 
size and scope of our business and have expanded our service offerings through 
a series of strategic acquisitions and internal growth.  We have more than 
3,600 employees worldwide, 3,500 of whom are located in North America in more 
than 100 locations.  In addition, we have established a presence in Asia, South 
America and Europe.

     Our principal executive offices are located at 670 North Rosemead 
Boulevard, Pasadena, California 91107, and our telephone number is (626) 
351-4664.  Our website is located at www.tetratech.com.  Information contained 
in our website is not a part of this prospectus.

                                USE OF PROCEEDS

     The selling stockholders are offering all of the shares of Common Stock 
covered by this prospectus.  We will not receive any proceeds from the sales of 
these shares.

                                  RISK FACTORS

     AN INVESTMENT IN THE SHARES OF COMMON STOCK OFFERED BY THIS PROSPECTUS 
INVOLVES A HIGH DEGREE OF RISK. YOU SHOULD CAREFULLY REVIEW THE FOLLOWING RISK 
FACTORS AS WELL AS THE OTHER INFORMATION SET FORTH IN THIS PROSPECTUS BEFORE 
MAKING AN INVESTMENT.

     SOME OF THE INFORMATION IN THIS PROSPECTUS OR INCORPORATED BY REFERENCE IN 
THIS PROSPECTUS CONTAINS FORWARD-LOOKING STATEMENTS THAT INVOLVE SUBSTANTIAL 
RISKS AND UNCERTAINTIES. YOU CAN IDENTIFY THESE STATEMENTS BY FORWARD-LOOKING 
WORDS SUCH AS "MAY," "WILL," "EXPECT," "ANTICIPATE," "BELIEVE," "ESTIMATE" AND 
"CONTINUE" OR SIMILAR WORDS. YOU SHOULD READ STATEMENTS THAT CONTAIN THESE 
WORDS CAREFULLY BECAUSE THEY: (1) DISCUSS OUR FUTURE EXPECTATIONS; (2) CONTAIN 
PROJECTIONS OF OUR FUTURE OPERATING RESULTS OR OF OUR FUTURE FINANCIAL 
CONDITION; OR (3) STATE OTHER "FORWARD-LOOKING" INFORMATION. WE BELIEVE IT IS 
IMPORTANT TO COMMUNICATE OUR EXPECTATIONS TO OUR INVESTORS. THERE MAY BE EVENTS 
IN THE FUTURE, HOWEVER, THAT WE ARE NOT ACCURATELY ABLE TO PREDICT OR OVER 
WHICH WE HAVE NO CONTROL. THE RISK FACTORS LISTED IN THIS SECTION, AS WELL AS 
ANY CAUTIONARY LANGUAGE IN THIS PROSPECTUS, PROVIDE EXAMPLES OF RISKS, 
UNCERTAINTIES AND EVENTS THAT MAY CAUSE OUR ACTUAL RESULTS TO DIFFER MATERIALLY 
FROM THE EXPECTATIONS WE DESCRIBE IN OUR FORWARD-LOOKING STATEMENTS. BEFORE YOU 
INVEST IN OUR COMMON STOCK, YOU SHOULD BE AWARE THAT THE OCCURRENCE OF ANY OF 
THE EVENTS DESCRIBED IN THESE RISK FACTORS AND ELSEWHERE IN THIS PROSPECTUS 
COULD HAVE A MATERIAL ADVERSE EFFECT ON OUR BUSINESS, FINANCIAL CONDITION AND 
OPERATING RESULTS AND THAT UPON THE OCCURRENCE OF ANY OF THESE EVENTS, THE 
TRADING PRICE OF OUR COMMON STOCK COULD DECLINE AND YOU COULD LOSE ALL OR PART 
OF YOUR INVESTMENT.

RISKS ASSOCIATED WITH OUR ACQUISITION STRATEGY

     A significant part of our growth strategy is to acquire other companies 
that complement our lines of business or that broaden our geographic presence. 
During fiscal 1998, we purchased ten companies in five separate transactions. 
We expect to continue to acquire companies as an element of our growth 
strategy. Acquisitions involve certain risks that could cause our actual growth 
or operating results to differ from our expectations or the expectations of 
security analysts. For example:


                                       2
<PAGE>

     -    We may not be able to identify suitable acquisition candidates or to 
          acquire additional companies on favorable terms;

     -    We compete with others to acquire companies.  We believe that this 
          competition will increase and may result in decreased availability or 
          increased price for suitable acquisition candidates;

     -    We may not be able to obtain the necessary financing, on favorable 
          terms or at all, to finance any of our potential acquisitions;

     -    We may ultimately fail to consummate an acquisition even if we 
          announce that we plan to acquire a company;

     -    We may fail to successfully integrate or manage these acquired 
          companies due to differences in business backgrounds or corporate 
          cultures;

     -    These acquired companies may not perform as we expect;

     -    We may find it difficult to provide a consistent quality of service 
          across our geographically diverse operations; and

     -    If we fail to successfully integrate any acquired company, our 
          reputation could be damaged. This could make it more difficult to 
          market our services or to acquire additional companies in the future.

In addition, our acquisition strategy may divert management's attention away 
from our primary service offerings, result in the loss of key clients or 
personnel and expose us to unanticipated liabilities. 

     Finally, acquired companies that derive a significant portion of their 
revenues from the Federal government and that do not follow the same cost 
accounting policies and billing procedures as we do may be subject to larger 
cost disallowances for greater periods than we are.  If we fail to determine 
the existence of unallowable costs and establish appropriate reserves in 
advance of an acquisition we may be exposed to material unanticipated 
liabilities, which could have a material adverse effect on our business.

FLUCTUATIONS IN OUR QUARTERLY OPERATING RESULTS

     Our quarterly revenues, expenses and operating results may fluctuate 
significantly because of a number of factors, including:

     -    The seasonality of the spending cycle of our public sector clients, 
          notably the Federal government;

     -    Employee hiring and utilization rates; 

     -    The number and significance of client engagements commenced and 
          completed during a quarter; 

     -    Delays incurred in connection with an engagement; 

     -    The ability of our clients to terminate engagements without 
          penalties; 

     -    The size and scope of engagements; 

     -    The timing and size of the return on investment capital; and 

     -    General economic and political conditions. 


                                      3
<PAGE>

Variations in any of these factors could cause significant fluctuations in 
our operating results from quarter to quarter and could result in net losses. 

POTENTIAL VOLATILITY OF OUR STOCK PRICE

     The trading price of our Common Stock has fluctuated widely.  In addition, 
in recent years the stock market has experienced extreme price and volume 
fluctuations.  The overall market and the price of our Common Stock may continue
to fluctuate greatly.  The trading price of our Common Stock may be 
significantly affected by various factors, including:

     -    Quarter to quarter variations in our operating results;

     -    Changes in environmental legislation;

     -    Changes in investors' and analysts' perception of the business risks 
          and conditions of our business;

     -    Broader market fluctuations; and

     -    General economic or political conditions.

MANAGEMENT OF GROWTH

     We are growing rapidly. Our growth presents numerous managerial, 
administrative, operational and other challenges. Our ability to manage the 
growth of our operations will require us to continue to improve our 
operational, financial and human resource management information systems and 
our other internal systems and controls. In addition, our growth will increase 
our need to attract, develop, motivate and retain both our management and 
professional employees. The inability of our management to manage our growth 
effectively or the inability of our employees to achieve anticipated 
performance or utilization levels, could have a material adverse effect on our 
business.

RELIANCE ON KEY PERSONNEL AND QUALIFIED PROFESSIONALS

     We depend upon the efforts and skills of our executive officers, senior 
managers and consultants.  With limited exceptions, we do not have employment 
agreements with any of these individuals.  The loss of the services of any of 
these key personnel could adversely affect our business. Although we have 
obtained non-compete agreements from the principal stockholders of each of the 
companies we have acquired, we generally do not have non-compete or employment 
agreements with key employees who were not equity holders of these companies. 
We do not maintain key-man life insurance policies on any of our executive 
officers or senior managers. 

     Our future growth and success depends on our ability to attract and retain 
qualified scientists and engineers.  The market for these professionals is 
competitive and we may not be able to attract and retain such professionals. 

DEPENDENCE UPON EXISTING LAWS AND REGULATIONS

     A significant amount of our resource management business is generated 
either directly or indirectly as a result of existing Federal and state 
governmental laws, regulations and programs. Any changes in these laws or 
regulations that reduce funding or affect the sponsorship of these programs 
could reduce the demand for our services and could have a material adverse 
effect on our business. 

CONCENTRATION OF REVENUES

     Agencies of the Federal government are among our most significant clients. 
During fiscal 1998 and the three months ended January 3, 1999, approximately 
46.8% and 41.5%, respectively, of our net revenue was derived from three 
federal agencies as follows:  26.2% and 22.8%, respectively, of our net revenue 
was derived from the Department of Defense (DOD), 17.1% and 14.4%, 
respectively, from the Environmental Protection Agency (EPA),


                                      4
<PAGE>

and 3.5% and 3.0%, respectively, from the Department of Energy (DOE).  Some 
of our contracts with Federal government agencies require annual funding 
approval and may be terminated at their discretion. A reduction in spending 
by Federal government agencies could limit the continued funding of our 
existing contracts with them and could limit our ability to obtain additional 
contracts.  These limitations, if significant, could have a material adverse 
effect on our business. 

     Additionally the failure of clients to pay significant amounts due us for 
our services could adversely affect our business.  For example, we recently 
received notification from a federal government agency that we are entitled to 
payments in excess of our billings.  However, the agency involved must obtain 
specific funding approval for amounts owed to us and there can be no assurance 
this funding approval will be obtained. 

RISKS ASSOCIATED WITH GOVERNMENTAL AUDITS

     Our contracts with the Federal government and other governmental agencies 
are subject to audit. Most of these audits are conducted by the Defense 
Contract Audit Agency (DCAA), which reviews our overhead rates, operating 
systems and cost proposals.  The DCAA may disallow costs if it determines that 
we accounted for these costs incorrectly or in a manner inconsistent with Cost 
Accounting Standards.  A disallowance of costs by the DCAA, or other 
governmental auditors, could have a material adverse effect on our business. 

     In September 1995, we acquired PRC Environmental Management, Inc. (EMI). 
EMI also contracts with Federal government agencies and such contracts are also 
subject to the same governmental audits.  The DCAA has completed audits of 
EMI's contracts for the fiscal years 1987 through 1995.  As a result of these 
audits and our negotiations with the DCAA, the DCAA disallowed approximately 
$2.9 million in costs. 

FIXED PRICE CONTRACTS

     We enter into various contracts with our clients, including fixed-price 
contracts. In fiscal 1998 and the three months ended January 3, 1999, 
approximately 26.1% and 30.4%, respectively, of our net revenue was derived 
from fixed-price contracts.  Fixed-price contracts protect clients and expose 
us to a number of risks.  These risks include underestimation of costs, 
problems with new technologies, unforeseen costs or difficulties, delays beyond 
our control and economic and other changes that may occur during the contract 
period. If we incur losses under fixed-price contracts it could have a material 
adverse effect on our business. 

DEPENDENCE ON SUBCONTRACTORS

     Under some of our contracts, we depend on the efforts and skills of 
subcontractors for the performance of certain tasks.  Our reliance on 
subcontractors varies from project to project.  In fiscal 1998 and the three 
months ended January 3, 1999, subcontractor costs comprised 22.3% and 21.7%, 
respectively, of our gross revenue.  The absence of qualified subcontractors 
with whom we have a satisfactory relationship could adversely affect the 
quality of our service and our ability to perform under some of our contracts. 

SIGNIFICANT COMPETITION

     We provide specialized management consulting and technical services to a 
broad range of public and private sector clients.  The market for our services 
is highly competitive and we compete with many other firms.  These firms range 
from small regional firms to large national firms which have greater financial 
and marketing resources than we do. 

     We focus primarily on the resource management, infrastructure and 
communications business areas.  We provide services to our clients which 
include Federal, state and local agencies, and organizations in the private 
sector. 

     We compete for projects and engagements with a number of competitors which 
can vary from 10 to 100 firms. Historically, clients have chosen among 
competing firms based on the quality and timeliness of the firm's service.  We 
believe, however, that price has become an increasingly important factor. 


                                      5
<PAGE>

     We believe that our principal competitors include, in alphabetical order, 
Black & Veatch LLP; Brown & Caldwell; Castle Tower Corporation; Camp, Dresser & 
McKee; CH2M Hill Companies Ltd.; Dames & Moore Group; EA Engineering, Science & 
Technology, Inc.; Earth Tech, Inc.; ICF Kaiser International, Inc.; IT Group 
Inc.; Mastec, Inc.; Montgomery Watson; OSP Consultants, Inc.; Roy F. Weston, 
Inc.; and URS Greiner Corporation. 

POTENTIAL LIABILITY AND INSURANCE

     Our services involve significant risks of professional and other 
liabilities which may substantially exceed the fees we derive from our 
services. Our business activities could expose us to potential liability under 
various environmental laws such as the Comprehensive Environmental Response, 
Compensation and Liability Act of 1980 (CERCLA).  In addition, we sometimes 
contractually assume liability under indemnification agreements.  We cannot 
predict the magnitude of such potential liabilities. 

     We currently maintain comprehensive general liability, umbrella and 
professional liability insurance policies. We believe that our insurance 
policies are adequate for our business operations.  These policies are "claims 
made" policies. Thus, only claims made during the term of the policy are 
covered.  If we terminate our policies and do not obtain retroactive coverage, 
we would be uninsured for claims made after termination even if these claims 
are based on events or acts that occurred during the term of the policy.  Our 
insurance may not protect us against liability because our policies typically 
have various exclusions and retentions.  In addition, if we expand into new 
markets, we may not be able to obtain insurance coverage for such activities 
or, if insurance is obtained, the dollar amount of any liabilities incurred 
could exceed our insurance coverage.  A partially or completely uninsured 
claim, if successful and of significant magnitude, could have a material 
adverse affect on our business. 

CONFLICTS OF INTEREST

     Many of our clients are concerned about potential or actual conflicts of 
interest in retaining management consultants.  Federal government agencies have 
formal policies against continuing or awarding contracts that would create 
actual or potential conflicts of interest with other activities of a 
contractor. These policies, among other things, may prevent us from bidding for 
or performing contracts resulting from or relating to certain work we have 
performed for the government.  In addition, services performed for a private 
client may create a conflict of interest that precludes or limits our ability 
to obtain work from other public or private organizations.  We have, on 
occasion, declined to bid on projects because of these conflicts of interest 
issues. 

RISKS ASSOCIATED WITH INTERNATIONAL OPERATIONS

     In fiscal 1998 and the three months ended January 3, 1999, approximately 
3.2% and 5.0%, respectively, of our net revenue was derived from the 
international marketplace.  Some contracts with our international clients are 
denominated in foreign currencies.  As such, these contracts contain inherent 
risks including foreign currency exchange risk and the risk associated with 
expatriating funds from foreign countries. If our international revenue 
increases, our exposure to foreign currency fluctuations will also increase.  
We have entered into forward exchange contracts to address certain foreign 
currency fluctuations. 

YEAR 2000

     We are working to resolve the potential impact of the year 2000 on our 
business operations and the ability of our computerized information systems to 
accurately process information that may be date-sensitive.  Any of our programs 
that recognize a date using "00" as the year 1900 rather than the year 2000 
could result in errors or system failures. 

     We utilize a number of computer programs across our entire operation.  The 
primary information technology systems we utilize are the accounting and 
financial and human resource information management systems.  We began our risk 
assessment in 1995.  Since that time we have procured and implemented certain 
accounting and financial reporting systems as well as contract administration 
and billing systems that have been certified as year 2000 compliant by our 
vendors.  Currently, approximately 72% of our gross revenue is recognized on 
these year


                                      6
<PAGE>

2000 compliant systems.  We believe that our financial and accounting and 
human resource management information systems will be year 2000 compliant in 
a timely manner and will not be materially impacted by the year 2000. We may 
fail, however, in updating our various systems to be year 2000 compliant in a 
timely manner.

     We have extensive business with the Federal government.  Should the 
Federal government, especially the DOD, experience significant business 
interruptions relating to non-year 2000 compliance, our business could be 
materially impacted.  To the extent that other third parties which we rely 
upon, such as banking institutions, clients and vendors, are unable to 
address their year 2000 issues in a timely manner, our business could be 
materially impacted.  We believe that the worst case scenario relating to the 
year 2000 would be an extensive period of time in which the Federal 
government and other third parties could not process payments promptly, in 
addition to our financial institutions not being able to supply us with our 
working capital needs.

     Additional risks associated with non-year 2000 compliance include:

     -    Our inability to invoice and process payments; 

     -    Our inability to produce accurate and timely financials; 

     -    The impact on our profitability; and 

     -    Our potential liability to third parties for not meeting contracted 
          deliverables. 

IMPACT OF ANTI-TAKEOVER PROVISIONS ON OUR STOCK PRICE

     Our certificate of incorporation and by-laws and the Delaware General 
Corporation Law include provisions that may be deemed to have anti-takeover 
effects.  These anti-takeover effects could delay or prevent a takeover attempt 
that you or our other stockholders might consider in your or their best 
interests. 

     In addition, our board of directors is authorized to issue, without 
obtaining stockholder approval, up to 2,000,000 shares of preferred stock and 
to determine the price, rights, preferences and privileges of such shares 
without any further stockholder action.  The existence of this "blank-check" 
preferred stock could make more difficult or discourage an attempt to obtain 
control of us by means of a tender offer, merger, proxy contest or otherwise. 

     In the future, we may adopt other measures that may have the effect of 
delaying, deferring or preventing an unsolicited takeover, even if such a 
change in control were at a premium price or favored by a majority of 
unaffiliated stockholders. Certain of these measures may be adopted without any 
further vote or action by the stockholders.


                                      7
<PAGE>

                     PRINCIPAL AND SELLING STOCKHOLDERS

     On September 22, 1998, we acquired, through our subsidiary, Tetra Tech 
Canada Ltd. (TTC), four Canadian and two U.S. corporations that are 
collectively referred to as the Sentrex Group of Companies (SGOC).  In 
connection with this acquisition, we issued to the SGOC shareholders an 
aggregate of 920,354 Exchangeable Shares of TTC and paid to the SGOC 
shareholders an aggregate of $4,515,467 in cash. The SGOC shareholders may 
exchange their Exchangeable Shares for shares of our Common Stock on and 
after February 22, 1999.

     Under a Registration Rights Agreement dated as of September 22, 1998, we 
agreed to register the shares of Common Stock issuable upon exchange of the 
Exchangeable Shares and to use commercially reasonable efforts to keep the 
registration statement effective until the date on which all selling 
stockholders may sell their shares of Common Stock under Rule 144 promulgated 
under the Securities Act of 1933, as amended (the "Securities Act"), without 
any volume limitation.  Our registration of the shares of Common Stock does 
not necessarily mean that the selling stockholders will sell all or any of 
the shares.

     The shares listed below represent all of the shares that each selling 
stockholder currently owns of our Common Stock. The following table sets 
forth certain information regarding the beneficial ownership of our Common 
Stock at February 17, 1999 and after giving effect to the sale by the selling 
stockholders of 920,354 shares of Common Stock in this offering by: (1) each 
director and executive officer; (2) each person we know to beneficially own 
more than 5% of the outstanding shares of our Common Stock; (3) all officers 
and directors as a group; and (4) the selling stockholders.  Except as 
otherwise noted, we know of no agreements among our stockholders which relate 
to voting or investment power over our Common Stock.  Except as otherwise 
noted, each person named below has an address in care of our principal 
executive offices.

<TABLE>
<CAPTION>
                                                                                                SHARES
                                                         SHARES                              BENEFICIALLY
                                                      BENEFICIALLY              NUMBER OF       OWNED
                                                       OWNED PRIOR               SHARES         AFTER
                      NAMES                            TO OFFERING     %(1)      OFFERED       OFFERING     %(1)
- ---------------------------------------------------   ------------     ----     ---------    ------------   ----
<S>                                                   <C>              <C>      <C>          <C>            <C>
Li-San Hwang(2) . . . . . . . . . . . . . . . . . .      1,629,961     5.5 %        --          1,629,961   5.5 %

Daniel A. Whalen(3) . . . . . . . . . . . . . . . .      1,538,649     5.2          --          1,538,649   5.2
     Whalen & Company, Inc.
     3675 Mt. Diablo Boulevard
     Suite 360
     Lafayette, California 94549

Pilgrim Baxter & Associates, Ltd.(4)  . . . . . . .      2,727,545     9.2          --          2,727,545   9.2
     825 Duportail Road
     Wayne, Pennsylvania 19087

T. Rowe Price Associates, Inc.(5) . . . . . . . . .      1,777,555     6.0          --          1,777,555   6.0
     100 E. Pratt Street
     Baltimore, Maryland 21202

J. Christopher Lewis(6) . . . . . . . . . . . . . .         76,472       *          --             76,472     *

Patrick C. Haden(7) . . . . . . . . . . . . . . . .         28,145       *          --             28,145     *

James J. Shelton(8) . . . . . . . . . . . . . . . .         20,869       *          --             20,869     *

Thomas D. Brisbin(9)  . . . . . . . . . . . . . . .         47,603       *          --             47,603     *

Charles R. Faust(10) . . . . . . . . . . . . . . . .        48,908       *          --             48,908     *

James M. Jaska(11)  . . . . . . . . . . . . . . . .         58,209       *          --             58,209     *

William R. Brownlie(12) . . . . . . . . . . . . . .        147,068       *          --            147,068     *

Steven A. Gherini(13) . . . . . . . . . . . . . . .        170,262       *          --            170,262     *

Arkan Say(14) . . . . . . . . . . . . . . . . . . .         39,157       *          --             39,157     *

Richard A. Lemmon(15) . . . . . . . . . . . . . . .         37,841       *          --             37,841     *

All directors and executive officers as a group
   (12 persons)(16) . . . . . . . . . . . . . . . .      3,843,144     12.9  %      --          3,843,144    12.9 %


                                      8

<PAGE>

<CAPTION>
                                                                                                SHARES
                                                         SHARES                              BENEFICIALLY
                                                      BENEFICIALLY              NUMBER OF       OWNED
                                                       OWNED PRIOR               SHARES         AFTER
                      NAMES                            TO OFFERING     %(1)      OFFERED       OFFERING     %(1)
- ---------------------------------------------------   ------------     ----     ---------    ------------   ----
<S>                                                   <C>              <C>      <C>          <C>            <C>
              SELLING STOCKHOLDERS

Angus Footman . . . . . . . . . . . . . . . . . .           45,980       *        45,980          --         *

Leonard Stanmore  . . . . . . . . . . . . . . . .          351,318     1.2       351,318          --        --

Peter Nicoletti . . . . . . . . . . . . . . . . .          227,541       *       227,541          --         *

Raymond Conroy  . . . . . . . . . . . . . . . . .          147,190       *       147,190          --         *

James Suen  . . . . . . . . . . . . . . . . . . .           57,653       *        57,653          --         *

Elizabeth Stanmore  . . . . . . . . . . . . . . .           79,598       *        79,598          --         *

Silvana Nicoletti . . . . . . . . . . . . . . . .            4,713       *         4,713          --         *

Andre Greco . . . . . . . . . . . . . . . . . . .            3,533       *         3,533          --         *

Gordon Brooks . . . . . . . . . . . . . . . . . .            2,827       *         2,827          --         *
</TABLE>

- ---------------
*     Represents less than 1% of the outstanding shares of Common Stock. 

(1)   Applicable percentages of ownership are based on 29,749,661 shares of
      Common Stock outstanding on February 17, 1999, adjusted as required by the
      rules promulgated by the Securities and Exchange Commission (SEC).  This
      table is based upon information supplied by officers, directors and
      principal stockholders and Schedules 13D and 13G (if any) filed with the
      SEC.  Unless otherwise indicated, and subject to community property laws
      where applicable, we believe that each of the stockholders named in this
      table has sole voting and investment power with respect to the shares
      indicated as beneficially owned. Any security that any person named above
      has the right to acquire within 60 days is deemed to be outstanding for
      purposes of calculating the percentage ownership of such person, but is 
      not deemed to be outstanding for purposes of calculating the ownership 
      percentage of any other person. 

(2)   Includes 26,563 shares issuable with respect to stock options exercisable 
      within 60 days after February 17, 1999. 

(3)   Includes 3,906 shares issuable with respect to stock options exercisable
      within 60 days after February 17, 1999.  Also includes (a) 1,181,399 
      shares of Common Stock held by Daniel A. Whalen and Katharine C. Whalen, 
      as Trustees for the Whalen Family Trust U/A/D 4/30/92, (b) 31,000 shares 
      of Common Stock held by Brown Investment Advisory & Trust Company, as 
      Trustee for the Whalen 1997 Charitable Remainder Unitrust, (c) 199,498 
      shares of Common Stock held by DKW/CRT Investments, and (d) 122,846 
      shares of Common Stock held by D-K-W Ventures LP.

(4)   All information regarding share ownership is taken from and furnished in
      reliance upon the Schedule 13G (Amendment No. 9), dated as of January 19,
      1999, filed by Pilgrim Baxter & Associates, Ltd.

(5)   All information regarding share ownership is taken from and furnished 
      in reliance upon the Schedule 13G, dated as of February 12, 1999, filed 
      by T. Rowe Price Associates, Inc.

(6)   Includes 19,070 shares issuable with respect to stock options exercisable
      within 60 days after February 17, 1999. 

(7)   Excludes an aggregate of 2,683 shares of Common Stock owned by Mr. Haden's
      wife as to which Mr. Haden disclaims beneficial ownership. Includes 19,070
      shares issuable with respect to stock options exercisable within 60 days
      after February 17, 1999. 

(8)   Includes 5,613 shares held by James J. Shelton, Sarah Belle Shelton and
      James J. Shelton, Jr., Trustees of the James J. Shelton and Sarah Belle
      Shelton Family Trust dated August 19, 1987, and 15,256 shares issuable 
      with respect to stock options exercisable within 60 days after 
      February 17, 1999.

(9)   Includes 46,835 shares issuable with respect to stock options exercisable
      within 60 days after February 17, 1999. 


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<PAGE>

(10)  Includes 21,230 shares issuable with respect to stock options exercisable
      within 60 days after February 17, 1999.  Additionally, Charles R. Faust's
      minor children own an aggregate of 2,882 shares of Common Stock as to 
      which Charles R. Faust disclaims beneficial ownership. 

(11)  Includes 57,558 shares issuable with respect to stock options exercisable
      within 60 days after February 17, 1999. 

(12)  Includes 41,484 shares issuable with respect to stock options exercisable
      within 60 days after February 17, 1999.  Also includes an aggregate of 400
      shares of Common Stock owned by Dr. Brownlie's minor children. 

(13)  Includes 27,090 shares issuable with respect to stock options exercisable
      within 60 days after February 17, 1999. 

(14)  Includes 14,157 shares issuable with respect to stock options exercisable
      within 60 days after February 17, 1999. 

(15)  Includes 11,945 shares issuable with respect to stock options exercisable
      within 60 days after February 17, 199. 

(16)  Includes 304,164 shares issuable with respect to stock options exercisable
      within 60 days after February 17, 1999.

     All selling stockholders are employees of SGOC, and no selling stockholder
has had any material relationship with us, or any of our predecessors or
affiliates.  Because the selling stockholders may sell all or part of their
shares of Common Stock offered hereby, no estimate can be given as to the number
of shares of Common Stock that will be held by any selling stockholder upon
termination of any offering made hereby.

                            PLAN OF DISTRIBUTION

     We are registering the shares of Common Stock on behalf of the selling 
stockholders.  As used herein, "selling stockholders" includes donees and 
pledgees selling shares received from a named selling shareholder after the 
date of this Prospectus.  This Prospectus may also be used by transferees of 
the selling stockholders or by other persons acquiring shares, including 
brokers who borrow the shares to settle short sales of shares of Common Stock.  
We will bear all costs, expenses and fees in connection with the registration 
of the shares offered hereby.  The selling stockholders will bear brokerage 
commissions and any similar selling expenses associated with the sale of shares.

     The selling stockholders may offer their shares of Common Stock at various 
times in one or more of the following transactions:

     -    on the Nasdaq National Market;

     -    in the over-the-counter market;

     -    in transactions other than on the Nasdaq National Market or in the
          over-the-counter market;

     -    in connection with short sales of the shares of Common Stock;

     -    by pledge to secure debts and other obligations;

     -    in connection with the writing of non-traded and exchange-traded call
          options, in hedge transactions and in settlement of other 
          transactions in standardized or over-the-counter options; or


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<PAGE>

     -    in any combination of any of the above transactions.

     In connection with hedging transactions, broker-dealers or other 
financial institutions may engage in short sales of the Common Stock in the 
course of hedging the positions they assume with selling stockholders. The 
selling stockholders may also enter into options or other transactions with 
broker-dealers or other financial institutions, which require the delivery to 
such broker-dealer or other financial institution of the shares offered 
hereby, which shares may be resold pursuant to this prospectus (as 
supplemented or amended to reflect such transaction).

     The selling stockholders may sell their shares at market prices prevailing 
at the time of sale, at prices related to such prevailing market prices, at 
negotiated prices or at fixed prices.  The selling shareholders may use 
broker-dealers to sell their shares.  If this happens, broker-dealers will 
either receive discounts or commissions from purchasers of shares for whom they 
acted as agents.

     The selling stockholders have advised us that they have not entered into 
any agreements, understandings or arrangements with any underwriters or 
broker-dealers regarding the sale of their securities, nor is there an 
underwriter or coordinating broker acting in connection with the proposed sale 
of shares by the selling stockholders.

     The selling stockholders and any broker-dealers that act in connection 
with the sale of shares might be deemed to be "underwriters" within the meaning 
of Section 2(11) of the Securities Act, and any commissions received by such 
broker-dealers and any profit on the resale of the shares sold by them while 
acting as principals might be deemed to be underwriting discounts or 
commissions under the Securities Act.  We have agreed to indemnify each selling 
stockholder against certain liabilities, including liabilities arising under 
the Securities Act.  The selling stockholders may agree to indemnify any agent, 
dealer or broker-dealer that participates in transactions involving sales of 
the shares against certain liabilities, including liabilities arising under the 
Securities Act.

     Because the selling stockholders may be deemed to be "underwriters" 
within the meaning of Section 2(11) of the Securities Act, the selling 
stockholders will be subject to the prospectus delivery requirements of the 
Securities Act. We have informed the selling stockholders that the 
anti-manipulative provisions of Regulation M promulgated under the Securities 
Exchange Act of 1934, as amended (the "Exchange Act"), may apply to their 
sales in the market.

     The selling stockholders also may resell all or a portion of the shares in 
open market transactions in reliance upon Rule 144 under the Securities Act, 
provided they meet the criteria and conform to the requirements of such Rule.

     Upon being notified by a selling stockholder that any material arrangement 
has been entered into with a broker-dealer for the sale of shares through a 
block trade, special offering, exchange distribution or secondary distribution 
or a purchase by a broker or dealer, we will file a supplement to this 
Prospectus, if required, pursuant to Rule 424(b) under the Securities Act, 
disclosing (i) the name of each such selling stockholder and of the 
participating broker-dealer(s), (ii) the number of shares involved, (iii) the 
price at which such shares were sold, (iv) the commissions paid or discounts or 
concessions allowed to such broker-dealer(s), where applicable, and (v) other 
facts material to the transaction.  In addition, upon being notified by a 
selling stockholder that a donee or pledgee intends to sell more than 500 
shares, we will file a supplement to this Prospectus.

                     WHERE YOU CAN FIND MORE INFORMATION

     We file annual, quarterly and special reports, proxy statements and other 
information with the Securities and Exchange Commission (SEC).  You may read 
and copy any document we file at the SEC's public reference room at 450 Fifth 
Street, N.W., Washington, D.C. 20549.  Please call the SEC at 1-800-SEC-0330 
for further information on the public reference room.  Our SEC filings are also 
available to the public from the SEC's Website at "http: //www.sec.gov." 

     The SEC allows us to "incorporate by reference" the information we file 
with them, which means that we can disclose important information to you by 
referring you to those documents.  The information incorporated by


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<PAGE>

reference is considered to be part of this prospectus, and information that we 
file later with the SEC will automatically update and supersede this 
information.  We incorporate by reference the documents listed below and any 
future filings we will make with the SEC under Sections 13(a), 13(c), 14 or 
15(d) of the Exchange Act: 

     1.   Annual Report on Form 10-K for the fiscal year ended October 4, 1998
          filed on December 31, 1998; 

     2.   Annual Report on Form 10-K/A (Amendment No. 1) for the fiscal year
          ended October 4, 1998 filed on February 2, 1999;

     3.   Quarterly Report on Form 10-Q for the fiscal quarter ended January 3,
          1999 filed on February 16, 1999.

     4.   Current Report on Form 8-K for the event of September 22, 1998, as
          filed with the SEC on October 7, 1998; 

     5.   Current Report on Form 8-K/A for event of September 22, 1998, as filed
          with the SEC on December 1, 1998; 

     6.   Definitive Proxy Statement, filed on December 31, 1998, for the 1999
          Annual Meeting of Stockholders;

     7.   Definitive Proxy Statement (Amendment No. 1), filed on January 12,
          1999, for the 1999 Annual Meeting of Stockholders; and

     8.   The description of the Common Stock set forth in the Registration
          Statement on Form 8-A dated November 13, 1991, including any
          amendments or reports filed for the purpose of updating such
          description. 

     You may request a copy of these filings, at no cost, by writing or 
telephoning James M. Jaska as follows:

                         Tetra Tech, Inc.
                         Attention: Investor Relations
                         670 North Rosemead Boulevard
                         Pasadena, CA 91107
                         (626) 351-4664

     This prospectus is part of a registration statement we filed with the SEC. 
You should rely only on the information or representations provided in this 
prospectus.  We have authorized no one to provide you with different 
information. We are not making an offer of these securities in any state where 
the offer is not permitted.  You should not assume that the information in this 
prospectus is accurate as of any date other than the date on the front of the 
document. 

                                 LEGAL MATTERS

     The validity of the Common Stock offered hereby will be passed on for us 
by Riordan & McKinzie, a Professional Corporation, Los Angeles, California. 
Certain principals of Riordan & McKinzie own, in the aggregate, approximately 
162,140 shares of Common Stock.


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<PAGE>

                                   EXPERTS

The financial statements and the related financial statement schedule 
incorporated in this prospectus by reference from our Annual Report on Form 
10-K for the year ended October 4, 1998 have been audited by Deloitte & Touche 
LLP, independent auditors, as stated in their reports, which are incorporated 
herein by reference, and have been so incorporated in reliance upon the reports 
of such firm given upon their authority as experts in accounting and auditing.


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