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<P ALIGN="CENTER"><FONT SIZE=2><B>As filed with the Securities and Exchange Commission on April 4, 2002  </B></FONT></P>

<P ALIGN="RIGHT"><FONT SIZE=2><B> Registration No.&nbsp;333-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</B></FONT></P>

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<P ALIGN="CENTER"><FONT SIZE=5><B>SECURITIES AND EXCHANGE COMMISSION<BR>  </B></FONT><FONT SIZE=2><B>Washington, D.C. 20549  </B></FONT></P>

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<P ALIGN="CENTER"><FONT SIZE=2><B> <A NAME="ba1253_form_s-8_registration_statemen__for02319"> </A>
<A NAME="toc_ba1253_1"> </A> </B></FONT><FONT SIZE=5><B>FORM S-8<BR>  </B></FONT><FONT SIZE=2><B>REGISTRATION STATEMENT<BR>  UNDER<BR>  THE SECURITIES ACT OF 1933    <BR>  </B></FONT></P>

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<P ALIGN="CENTER"><FONT SIZE=5><B>TETRA TECH,&nbsp;INC.<BR>  </B></FONT><FONT SIZE=2>(Exact name of registrant as specified in its charter) </FONT></P>

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<TD WIDTH="50%" ALIGN="CENTER" VALIGN="TOP"><FONT SIZE=2><B>Delaware</B></FONT></TD>
<TD WIDTH="50%" ALIGN="CENTER" VALIGN="TOP"><FONT SIZE=2><B>95-4148514</B></FONT></TD>
</TR>
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<TD WIDTH="50%" ALIGN="CENTER" VALIGN="TOP"><FONT SIZE=2>(State or other jurisdiction of<BR>
incorporation or organization)</FONT></TD>
<TD WIDTH="50%" ALIGN="CENTER" VALIGN="TOP"><FONT SIZE=2>(IRS Employer Identification No.)</FONT></TD>
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<P ALIGN="CENTER"><FONT SIZE=2><B>670 North Rosemead Boulevard, Pasadena, CA 91107<BR>
(626)&nbsp;351-4664<BR>  </B></FONT><FONT SIZE=2>(Address, including zip code, and telephone number, including<BR>
area code, of registrant's principal executive offices) </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><B>TETRA TECH,&nbsp;INC.<BR>
2002 STOCK OPTION PLAN<BR>  </B></FONT><FONT SIZE=2>(Full title of the plan) </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><B>Li-San Hwang<BR>
Chief Executive Officer<BR>
TETRA TECH,&nbsp;INC.<BR>
670 North Rosemead Boulevard, Pasadena, CA 91107<BR>
(626)&nbsp;351-4664<BR>  </B></FONT><FONT SIZE=2>(Name, address, including zip code, and telephone number, including<BR>
area code, of agent for service) </FONT></P>

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<P ALIGN="CENTER"><FONT SIZE=2><B>Copy to:  </B></FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><B> Janis B. Salin, Esq.<BR>
Vice President and General Counsel<BR>
Tetra Tech, Inc.<BR>
670 North Rosemead Boulevard<BR>
Pasadena, CA 91107  </B></FONT></P>

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<P ALIGN="CENTER"><FONT SIZE=2><B> CALCULATION OF REGISTRATION FEE  </B></FONT></P>

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<TD WIDTH="36%" ALIGN="CENTER" VALIGN="BOTTOM"><FONT SIZE=1><B>Title of Each Class of<BR>
Securities to be Registered</B></FONT></TD>
<TD WIDTH="1%" VALIGN="BOTTOM"><FONT SIZE=1>&nbsp;</FONT></TD>
<TD WIDTH="15%" ALIGN="CENTER" VALIGN="BOTTOM"><FONT SIZE=1><B>Amount to<BR>
be Registered</B></FONT></TD>
<TD WIDTH="1%" VALIGN="BOTTOM"><FONT SIZE=1>&nbsp;</FONT></TD>
<TD WIDTH="15%" ALIGN="CENTER" VALIGN="BOTTOM"><FONT SIZE=1><B>Proposed Maximum<BR>
Offering Price<BR>
Per Share(1)</B></FONT></TD>
<TD WIDTH="1%" VALIGN="BOTTOM"><FONT SIZE=1>&nbsp;</FONT></TD>
<TD WIDTH="15%" ALIGN="CENTER" VALIGN="BOTTOM"><FONT SIZE=1><B>Proposed Maximum<BR>
Aggregate<BR>
Offering Price(1)</B></FONT></TD>
<TD WIDTH="1%" VALIGN="BOTTOM"><FONT SIZE=1>&nbsp;</FONT></TD>
<TD WIDTH="15%" ALIGN="CENTER" VALIGN="BOTTOM"><FONT SIZE=1><B>Amount of<BR>
Registration Fee</B></FONT></TD>
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<TD WIDTH="36%"><FONT SIZE=2>Common Stock, $.01 par value shares</FONT></TD>
<TD WIDTH="1%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="15%" ALIGN="CENTER"><FONT SIZE=2>4,000,000</FONT></TD>
<TD WIDTH="1%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="15%" ALIGN="CENTER"><FONT SIZE=2>$14.05</FONT></TD>
<TD WIDTH="1%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="15%" ALIGN="CENTER"><FONT SIZE=2>$56,200,000</FONT></TD>
<TD WIDTH="1%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="15%" ALIGN="CENTER"><FONT SIZE=2>$5,171</FONT></TD>
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<DT style='margin-bottom:-11pt;'><FONT SIZE=2>(1)</FONT></DT><DD><FONT SIZE=2>Estimated
solely for the purpose of calculating the registration fee pursuant to Rule&nbsp;457(h) under the Securities Act of 1933, as amended, based upon the last sales price for
the registrant's common stock as reported on the Nasdaq National Market System on April 1, 2002. </FONT></DD></DL>
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<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="ja1253_part_ii_information_req__ja102469"> </A>
<A NAME="toc_ja1253_1"> </A>
<BR></FONT><FONT SIZE=2><B>PART II<BR>  <BR>    INFORMATION REQUIRED IN THE REGISTRATION STATEMENT    <BR>  </B></FONT></P>

<P><FONT SIZE=2><A
NAME="ja1253_item_3._incorporation_of_documents_by_reference."> </A>
<A NAME="toc_ja1253_2"> </A></FONT> <FONT SIZE=2><B>Item 3. Incorporation of Documents by Reference.    <BR>  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The following documents which Tetra Tech,&nbsp;Inc. (the "Company") has filed with the Securities and Exchange Commission (the "Commission") are incorporated by
reference into this registration statement: </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1)&nbsp;&nbsp;the
Annual Report of the Company on Form&nbsp;10-K for the fiscal year ended September&nbsp;30, 2001, as filed with the Commission on December&nbsp;31,
2001; </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2)&nbsp;&nbsp;the
Quarterly Report of the Company on Form&nbsp;10-Q for the fiscal quarter ended December&nbsp;30, 2001, as filed with the Commission on
February&nbsp;13, 2002; </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3)&nbsp;&nbsp;the
Current Reports of the Company on Form&nbsp;8-K, as filed with the Commission on January&nbsp;17, 2002 and March&nbsp;15, 2002; </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(4)&nbsp;&nbsp;the
Definitive Proxy Statement of the Company on Schedule&nbsp;14A, as filed with the Commission on December&nbsp;31, 2001; and </FONT></P>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(5)&nbsp;&nbsp;the
description of the Company's securities contained in the Company's Registration Statement on Form&nbsp;8-A dated November&nbsp;13, 1991, including
any amendments or reports filed for the purpose of updating such description. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;All
documents filed by the Company pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934 and prior to the filing of a post-effective amendment
to the registration statement that indicates that all securities offered hereby have been sold or that deregisters all such securities remaining unsold, shall be deemed to be incorporated by reference
herein and to be a part hereof from the date of filing such documents. Any statement contained herein or in any document incorporated or deemed to be incorporated by reference herein shall be deemed
to be modified or superseded for purposes of this registration statement to the extent that a statement contained herein or in any other subsequently filed document which also is or is deemed to be
incorporated by reference herein modifies or supersedes such statement. Any such statement so modified or superseded shall not be deemed to constitute a part of this registration statement, except as
so modified or superseded. </FONT></P>

<P><FONT SIZE=2><A
NAME="ja1253_item_4._description_of_securities."> </A>
<A NAME="toc_ja1253_3"> </A>
<BR></FONT><FONT SIZE=2><B>Item 4. Description of Securities.    <BR>  </B></FONT></P>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not applicable. </FONT></P>

<P><FONT SIZE=2><A
NAME="ja1253_item_5._interests_of_named_experts_and_counsel."> </A>
<A NAME="toc_ja1253_4"> </A>
<BR></FONT><FONT SIZE=2><B>Item 5. Interests of Named Experts and Counsel.    <BR>  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The validity of the Company's common stock, par value $.01 per share, offered hereby has been passed upon by Janis B. Salin, Esq., Vice President and General
Counsel of the Company. As of this date, Ms.&nbsp;Salin beneficially owns shares of the Company's common stock, par value $.01 per share, and also has options to purchase additional shares of the
Company's common stock, par value $.01 per share. </FONT></P>

<P><FONT SIZE=2><A
NAME="ja1253_item_6._indemnification_of_directors_and_officers."> </A>
<A NAME="toc_ja1253_5"> </A>
<BR></FONT><FONT SIZE=2><B>Item 6. Indemnification of Directors and Officers.    <BR>  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Company's certificate of incorporation and bylaws provide for indemnification of the officers and directors of the Company to the fullest extent permitted by
law. Section&nbsp;102(b)(7) of the Delaware General Corporation Law (the "DGCL") provides that a Delaware corporation has the power to eliminate or limit the personal liability of a
director for violations of the director's fiduciary duty, except (i)&nbsp;for any breach of the director's duty of loyalty to the corporation or its stockholders, (ii)&nbsp;for </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2>II-1</FONT></P>

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acts or omissions not in good faith or which involve intentional misconduct or a knowing violation of law, (iii)&nbsp;pursuant to Section&nbsp;174 of the DGCL (providing for liability of
directors for unlawful payments of dividends or unlawful stock purchases or redemptions), or (iv)&nbsp;for any transaction from which a director derived an improper personal benefit. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Section&nbsp;145
of the DGCL provides that a corporation may indemnify any persons, including officers and directors, who are, or are threatened to be made, parties to any threatened,
pending or completed legal
action, suit or proceeding, whether civil, criminal, administrative or investigative (other than an action by or in the right of such corporation), by reason of the fact that such person was a
director, officer, employee or agent of such corporation, or is or was serving at the request of such corporation or enterprise. The indemnity may include expenses (including attorneys' fees),
judgments, fines and amounts paid in settlement actually and reasonably incurred by such person in connection with such action, suit or proceeding, if such person acted in good faith and in a manner
he reasonably believed to be in or not opposed to the corporation's best interests and, for criminal proceedings, had no reasonable cause to believe that his conduct was unlawful. A Delaware
corporation may indemnify officers and directors in an action by or in the right of the corporation under the same conditions, except that no indemnification is permitted without judicial approval if
the officer or director is adjudged to be liable to the corporation. Where an officer is successful on the merits or otherwise in the defense of any action referred to above, the corporation must
indemnify him against the expenses which such officer or director actually and reasonably incurred. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In
addition, the Company maintains directors' and officers' liability insurance policies. </FONT></P>

<P><FONT SIZE=2><A
NAME="ja1253_item_7._exemptions_from_registration_claimed."> </A>
<A NAME="toc_ja1253_6"> </A>
<BR></FONT><FONT SIZE=2><B>Item 7. Exemptions from Registration Claimed.    <BR>  </B></FONT></P>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not applicable. </FONT></P>

<P><FONT SIZE=2><A
NAME="ja1253_item_8._exhibits."> </A>
<A NAME="toc_ja1253_7"> </A>
<BR></FONT><FONT SIZE=2><B>Item 8. Exhibits.    <BR>  </B></FONT></P>

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<TD WIDTH="6%"><FONT SIZE=2>5.1</FONT></TD>
<TD WIDTH="94%"><FONT SIZE=2>Opinion of Janis B. Salin, Esq., Vice President and General Counsel of the Company, as to the legality of the&nbsp;common stock registered hereby.</FONT></TD>
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<TD WIDTH="6%"><FONT SIZE=2>23.1</FONT></TD>
<TD WIDTH="94%"><FONT SIZE=2>Consent of Deloitte&nbsp;&amp; Touche LLP.</FONT></TD>
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<TD WIDTH="6%"><FONT SIZE=2>23.2</FONT></TD>
<TD WIDTH="94%"><FONT SIZE=2>Consent of Counsel (included in Exhibit&nbsp;5.1).</FONT></TD>
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<TD WIDTH="6%"><FONT SIZE=2>24.1</FONT></TD>
<TD WIDTH="94%"><FONT SIZE=2>Power of Attorney (included on Page II-4 hereto).</FONT></TD>
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<TD WIDTH="6%"><FONT SIZE=2>99.1</FONT></TD>
<TD WIDTH="94%"><FONT SIZE=2>Form of Tetra Tech,&nbsp;Inc. 2002 Stock Option Plan (incorporated by reference from Exhibit&nbsp;10.15 to the Company's Annual Report Form&nbsp;10-K for the fiscal year ended September&nbsp;30, 2001).</FONT></TD>
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<P><FONT SIZE=2><A
NAME="ja1253_item_9._undertakings."> </A>
<A NAME="toc_ja1253_8"> </A>
<BR></FONT><FONT SIZE=2><B>Item 9. Undertakings.    <BR>  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The undersigned registrant hereby undertakes: </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1)&nbsp;&nbsp;To
file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement: </FONT></P>

<UL>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i)&nbsp;&nbsp;&nbsp;&nbsp;To
include any prospectus required by section&nbsp;10(a)(3) of the Securities Act of 1933; </FONT></P>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii)&nbsp;&nbsp;To
reflect in the prospectus any facts or events arising after the effective date of the registration statement (or the most recent post-effective amendment
thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in the registration statement; </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii)&nbsp;&nbsp;To
include any material information with respect to the plan of distribution not previously disclosed in the registration statement or any material change to such
information in the registration statement; </FONT></P>

</UL>
<P ALIGN="CENTER"><FONT SIZE=2>II-2</FONT></P>

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<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><FONT
SIZE=2><I>Provided however</I></FONT><FONT SIZE=2>, that paragraphs (i)&nbsp;and (ii)&nbsp;above do not apply if the information required to be included in a
post-effective amendment by those paragraphs is contained in periodic reports filed by the registrant pursuant to Section&nbsp;13 or Section&nbsp;15(d) of the Securities Exchange Act
of 1934 that are incorporated by reference in the registration statement. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2)&nbsp;&nbsp;That,
for the purpose of determining any liability under the Securities Act of 1933, each such post-effective amendment shall be deemed to be a new
registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3)&nbsp;&nbsp;To
remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination of the
offering. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(4)&nbsp;&nbsp;That,
for purposes of determining any liability under the Securities Act of 1933, each filing of the registrant's annual report pursuant to Section&nbsp;13(a) or
Section&nbsp;15(d) of the Securities Exchange Act of 1934 (and, where applicable, each filing of an employee benefit plan's annual report pursuant to Section&nbsp;15(d) of the Securities Exchange
Act of 1934) that is incorporated by reference in the registration statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such
securities at that time shall be deemed to be the initial bona fide offering thereof. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Insofar
as indemnification for liabilities under the Securities Act of 1933 may be permitted to directors, officers and controlling persons of the registrant pursuant to the foregoing
provisions, or otherwise, the registrant has been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed in the Act and is,
therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the registrant of expenses incurred or paid by a director, officer or
controlling person of the registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being
registered, the registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Act and will be governed by the final adjudication of such issue. </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2>II-3</FONT></P>

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<A NAME="toc_jc1253_1"> </A>
<BR></FONT><FONT SIZE=2><B>SIGNATURES    <BR>  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form&nbsp;S-8 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of
Pasadena, State of California, on this 4<SUP>th</SUP> day of April, 2002. </FONT></P>

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<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD COLSPAN=2><FONT SIZE=2>TETRA TECH, INC.</FONT></TD>
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<TD WIDTH="46%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="5%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="46%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
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<TD WIDTH="46%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="5%"><FONT SIZE=2>By:</FONT></TD>
<TD WIDTH="46%"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
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<TD WIDTH="46%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="5%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="46%"><FONT SIZE=2>/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>LI-SAN HWANG</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Li-San Hwang<BR>
Chairman and Chief Executive Officer</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="46%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="5%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="46%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
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<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="jc1253_power_of_attorney"> </A>
<A NAME="toc_jc1253_2"> </A>
<BR></FONT><FONT SIZE=2><B>POWER OF ATTORNEY    <BR>  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints Li-San Hwang and James&nbsp;M. Jaska, and
each of them, his true and lawful attorneys-in-fact and agents with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all
capacities, to sign any and all amendments (including post-effective amendments) to this registration statement, and to file the same, with all exhibits thereto, and other documents in connection
therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and
every act and thing requisite or necessary to be done, as fully to all intents and purposes as he might or could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents, or any of them, or their substitute or substitutes, may lawfully do or cause to be done by virtue hereof. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant
to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated. </FONT></P>

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<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="38%" ALIGN="CENTER"><FONT SIZE=1><B>Title(s)</B></FONT><HR NOSHADE></TH>
<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="19%" ALIGN="CENTER"><FONT SIZE=1><B>Date</B></FONT><HR NOSHADE></TH>
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<TD WIDTH="38%" ALIGN="CENTER" VALIGN="CENTER"><BR><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%" VALIGN="CENTER"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="38%" VALIGN="CENTER"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="3%" VALIGN="CENTER"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%" VALIGN="CENTER"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="38%" ALIGN="CENTER" VALIGN="CENTER"><FONT SIZE=2>/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>LI-SAN HWANG</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Li-San Hwang</FONT></TD>
<TD WIDTH="3%" VALIGN="CENTER"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="38%" VALIGN="CENTER"><FONT SIZE=2>Chairman of the Board and Chief Executive Officer (Principal Executive Officer)</FONT></TD>
<TD WIDTH="3%" VALIGN="CENTER"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="CENTER" VALIGN="CENTER"><FONT SIZE=2>April 4, 2002</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="38%" ALIGN="CENTER" VALIGN="CENTER"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>JAMES M. JASKA</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> James M. Jaska</FONT></TD>
<TD WIDTH="3%" VALIGN="CENTER"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="38%" VALIGN="CENTER"><FONT SIZE=2><BR>
President, Chief Financial Officer and Treasurer (Principal Financial and Accounting Officer)</FONT></TD>
<TD WIDTH="3%" VALIGN="CENTER"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="CENTER" VALIGN="CENTER"><FONT SIZE=2><BR>
April 4, 2002</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="38%" ALIGN="CENTER" VALIGN="CENTER"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>J. CHRISTOPHER LEWIS</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> J. Christopher Lewis</FONT></TD>
<TD WIDTH="3%" VALIGN="CENTER"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="38%" VALIGN="CENTER"><FONT SIZE=2><BR>
Director</FONT></TD>
<TD WIDTH="3%" VALIGN="CENTER"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="CENTER" VALIGN="CENTER"><FONT SIZE=2><BR>
April 3, 2002</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="38%" ALIGN="CENTER" VALIGN="CENTER"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>PATRICK C. HADEN</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Patrick C. Haden</FONT></TD>
<TD WIDTH="3%" VALIGN="CENTER"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="38%" VALIGN="CENTER"><FONT SIZE=2><BR>
Director</FONT></TD>
<TD WIDTH="3%" VALIGN="CENTER"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="CENTER" VALIGN="CENTER"><FONT SIZE=2><BR>
April 2, 2002</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="38%" ALIGN="CENTER" VALIGN="CENTER"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>JAMES J. SHELTON</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> James J. Shelton</FONT></TD>
<TD WIDTH="3%" VALIGN="CENTER"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="38%" VALIGN="CENTER"><FONT SIZE=2><BR>
Director</FONT></TD>
<TD WIDTH="3%" VALIGN="CENTER"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="CENTER" VALIGN="CENTER"><FONT SIZE=2><BR>
April 3, 2002</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="38%" ALIGN="CENTER" VALIGN="CENTER"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DANIEL A. WHALEN</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Daniel A. Whalen</FONT></TD>
<TD WIDTH="3%" VALIGN="CENTER"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="38%" VALIGN="CENTER"><FONT SIZE=2><BR>
Director</FONT></TD>
<TD WIDTH="3%" VALIGN="CENTER"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="CENTER" VALIGN="CENTER"><FONT SIZE=2><BR>
April 2, 2002</FONT></TD>
</TR>
</TABLE>
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<P ALIGN="CENTER"><FONT SIZE=2>II-4</FONT></P>

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<P><br><A NAME="02BHL1253_1">QuickLinks</A><br></P><!-- TOC_BEGIN -->
<FONT SIZE=2><A HREF="#toc_ba1253_1">FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933</A></FONT><BR>
<!-- TOC_BEGIN -->
<FONT SIZE=2><A HREF="#toc_ja1253_1">PART II INFORMATION REQUIRED IN THE REGISTRATION STATEMENT</A></FONT><BR>
<UL>
<FONT SIZE=2><A HREF="#toc_ja1253_2">Item 3. Incorporation of Documents by Reference.</A></FONT><BR>
<FONT SIZE=2><A HREF="#toc_ja1253_3">Item 4. Description of Securities.</A></FONT><BR>
<FONT SIZE=2><A HREF="#toc_ja1253_4">Item 5. Interests of Named Experts and Counsel.</A></FONT><BR>
<FONT SIZE=2><A HREF="#toc_ja1253_5">Item 6. Indemnification of Directors and Officers.</A></FONT><BR>
<FONT SIZE=2><A HREF="#toc_ja1253_6">Item 7. Exemptions from Registration Claimed.</A></FONT><BR>
<FONT SIZE=2><A HREF="#toc_ja1253_7">Item 8. Exhibits.</A></FONT><BR>
<FONT SIZE=2><A HREF="#toc_ja1253_8">Item 9. Undertakings.</A></FONT><BR>
</UL>
<!-- TOC_BEGIN -->
<FONT SIZE=2><A HREF="#toc_jc1253_1">SIGNATURES</A></FONT><BR>
<FONT SIZE=2><A HREF="#toc_jc1253_2">POWER OF ATTORNEY</A></FONT><BR>
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{"company-data": {"conformed-name": "TETRA TECH INC", "cik": "0000831641", "assigned-sic": "8711", "irs-number": "954148514", "state-of-incorporation": "DE", "fiscal-year-end": "0930"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "333-85558", "film-number": "02602305"}, "business-address": {"street1": "670 N ROSEMEAD BOULEVARD", "city": "PASEDENA", "state": "CA", "zip": "91107-2190", "phone": "6263514664"}, "mail-address": {"street1": "670 N ROSEMEAD BLVD", "city": "PASADENA", "state": "CA", "zip": "91107"}}
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As filed with the Securities and Exchange Commission on April 4, 2002
Registration No. 333-
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM S-8
REGISTRATION STATEMENT
UNDER
THE SECURITIES ACT OF 1933
TETRA TECH, INC.
(Exact name of registrant as specified in its charter)
Delaware
95-4148514
(State or other jurisdiction of
incorporation or organization)
(IRS Employer Identification No.)
670 North Rosemead Boulevard, Pasadena, CA 91107
(626) 351-4664
(Address, including zip code, and telephone number, including
area code, of registrant's principal executive offices)
TETRA TECH, INC.
2002 STOCK OPTION PLAN
(Full title of the plan)
Li-San Hwang
Chief Executive Officer
TETRA TECH, INC.
670 North Rosemead Boulevard, Pasadena, CA 91107
(626) 351-4664
(Name, address, including zip code, and telephone number, including
area code, of agent for service)
Copy to:
Janis B. Salin, Esq.
Vice President and General Counsel
Tetra Tech, Inc.
670 North Rosemead Boulevard
Pasadena, CA 91107
CALCULATION OF REGISTRATION FEE
Title of Each Class of
Securities to be Registered
Amount to
be Registered
Proposed Maximum
Offering Price
Per Share(1)
Proposed Maximum
Aggregate
Offering Price(1)
Amount of
Registration Fee
Common Stock, $.01 par value shares
4,000,000
$14.05
$56,200,000
$5,171
(1)
Estimated
solely for the purpose of calculating the registration fee pursuant to Rule 457(h) under the Securities Act of 1933, as amended, based upon the last sales price for
the registrant's common stock as reported on the Nasdaq National Market System on April 1, 2002.
PART II
INFORMATION REQUIRED IN THE REGISTRATION STATEMENT
Item 3. Incorporation of Documents by Reference.
The following documents which Tetra Tech, Inc. (the "Company") has filed with the Securities and Exchange Commission (the "Commission") are incorporated by
reference into this registration statement:
(1)  the
Annual Report of the Company on Form 10-K for the fiscal year ended September 30, 2001, as filed with the Commission on December 31,
2001;
(2)  the
Quarterly Report of the Company on Form 10-Q for the fiscal quarter ended December 30, 2001, as filed with the Commission on
February 13, 2002;
(3)  the
Current Reports of the Company on Form 8-K, as filed with the Commission on January 17, 2002 and March 15, 2002;
(4)  the
Definitive Proxy Statement of the Company on Schedule 14A, as filed with the Commission on December 31, 2001; and
(5)  the
description of the Company's securities contained in the Company's Registration Statement on Form 8-A dated November 13, 1991, including
any amendments or reports filed for the purpose of updating such description.
All
documents filed by the Company pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934 and prior to the filing of a post-effective amendment
to the registration statement that indicates that all securities offered hereby have been sold or that deregisters all such securities remaining unsold, shall be deemed to be incorporated by reference
herein and to be a part hereof from the date of filing such documents. Any statement contained herein or in any document incorporated or deemed to be incorporated by reference herein shall be deemed
to be modified or superseded for purposes of this registration statement to the extent that a statement contained herein or in any other subsequently filed document which also is or is deemed to be
incorporated by reference herein modifies or supersedes such statement. Any such statement so modified or superseded shall not be deemed to constitute a part of this registration statement, except as
so modified or superseded.
Item 4. Description of Securities.
Not applicable.
Item 5. Interests of Named Experts and Counsel.
The validity of the Company's common stock, par value $.01 per share, offered hereby has been passed upon by Janis B. Salin, Esq., Vice President and General
Counsel of the Company. As of this date, Ms. Salin beneficially owns shares of the Company's common stock, par value $.01 per share, and also has options to purchase additional shares of the
Company's common stock, par value $.01 per share.
Item 6. Indemnification of Directors and Officers.
The Company's certificate of incorporation and bylaws provide for indemnification of the officers and directors of the Company to the fullest extent permitted by
law. Section 102(b)(7) of the Delaware General Corporation Law (the "DGCL") provides that a Delaware corporation has the power to eliminate or limit the personal liability of a
director for violations of the director's fiduciary duty, except (i) for any breach of the director's duty of loyalty to the corporation or its stockholders, (ii) for
II-1
acts or omissions not in good faith or which involve intentional misconduct or a knowing violation of law, (iii) pursuant to Section 174 of the DGCL (providing for liability of
directors for unlawful payments of dividends or unlawful stock purchases or redemptions), or (iv) for any transaction from which a director derived an improper personal benefit.
Section 145
of the DGCL provides that a corporation may indemnify any persons, including officers and directors, who are, or are threatened to be made, parties to any threatened,
pending or completed legal
action, suit or proceeding, whether civil, criminal, administrative or investigative (other than an action by or in the right of such corporation), by reason of the fact that such person was a
director, officer, employee or agent of such corporation, or is or was serving at the request of such corporation or enterprise. The indemnity may include expenses (including attorneys' fees),
judgments, fines and amounts paid in settlement actually and reasonably incurred by such person in connection with such action, suit or proceeding, if such person acted in good faith and in a manner
he reasonably believed to be in or not opposed to the corporation's best interests and, for criminal proceedings, had no reasonable cause to believe that his conduct was unlawful. A Delaware
corporation may indemnify officers and directors in an action by or in the right of the corporation under the same conditions, except that no indemnification is permitted without judicial approval if
the officer or director is adjudged to be liable to the corporation. Where an officer is successful on the merits or otherwise in the defense of any action referred to above, the corporation must
indemnify him against the expenses which such officer or director actually and reasonably incurred.
In
addition, the Company maintains directors' and officers' liability insurance policies.
Item 7. Exemptions from Registration Claimed.
Not applicable.
Item 8. Exhibits.
5.1
Opinion of Janis B. Salin, Esq., Vice President and General Counsel of the Company, as to the legality of the common stock registered hereby.
23.1
Consent of Deloitte & Touche LLP.
23.2
Consent of Counsel (included in Exhibit 5.1).
24.1
Power of Attorney (included on Page II-4 hereto).
99.1
Form of Tetra Tech, Inc. 2002 Stock Option Plan (incorporated by reference from Exhibit 10.15 to the Company's Annual Report Form 10-K for the fiscal year ended September 30, 2001).
Item 9. Undertakings.
The undersigned registrant hereby undertakes:
(1)  To
file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement:
(i)    To
include any prospectus required by section 10(a)(3) of the Securities Act of 1933;
(ii)  To
reflect in the prospectus any facts or events arising after the effective date of the registration statement (or the most recent post-effective amendment
thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in the registration statement;
(iii)  To
include any material information with respect to the plan of distribution not previously disclosed in the registration statement or any material change to such
information in the registration statement;
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Provided however
, that paragraphs (i) and (ii) above do not apply if the information required to be included in a
post-effective amendment by those paragraphs is contained in periodic reports filed by the registrant pursuant to Section 13 or Section 15(d) of the Securities Exchange Act
of 1934 that are incorporated by reference in the registration statement.
(2)  That,
for the purpose of determining any liability under the Securities Act of 1933, each such post-effective amendment shall be deemed to be a new
registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.
(3)  To
remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination of the
offering.
(4)  That,
for purposes of determining any liability under the Securities Act of 1933, each filing of the registrant's annual report pursuant to Section 13(a) or
Section 15(d) of the Securities Exchange Act of 1934 (and, where applicable, each filing of an employee benefit plan's annual report pursuant to Section 15(d) of the Securities Exchange
Act of 1934) that is incorporated by reference in the registration statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such
securities at that time shall be deemed to be the initial bona fide offering thereof.
Insofar
as indemnification for liabilities under the Securities Act of 1933 may be permitted to directors, officers and controlling persons of the registrant pursuant to the foregoing
provisions, or otherwise, the registrant has been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed in the Act and is,
therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the registrant of expenses incurred or paid by a director, officer or
controlling person of the registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being
registered, the registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Act and will be governed by the final adjudication of such issue.
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SIGNATURES
Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-8 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of
Pasadena, State of California, on this 4
th
day of April, 2002.
TETRA TECH, INC.
By:
/s/
LI-SAN HWANG
Li-San Hwang
Chairman and Chief Executive Officer
POWER OF ATTORNEY
KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints Li-San Hwang and James M. Jaska, and
each of them, his true and lawful attorneys-in-fact and agents with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all
capacities, to sign any and all amendments (including post-effective amendments) to this registration statement, and to file the same, with all exhibits thereto, and other documents in connection
therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and
every act and thing requisite or necessary to be done, as fully to all intents and purposes as he might or could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents, or any of them, or their substitute or substitutes, may lawfully do or cause to be done by virtue hereof.
Pursuant
to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated.
Signature
Title(s)
Date
/s/
LI-SAN HWANG
Li-San Hwang
Chairman of the Board and Chief Executive Officer (Principal Executive Officer)
April 4, 2002
/s/
JAMES M. JASKA
James M. Jaska
President, Chief Financial Officer and Treasurer (Principal Financial and Accounting Officer)
April 4, 2002
/s/
J. CHRISTOPHER LEWIS
J. Christopher Lewis
Director
April 3, 2002
/s/
PATRICK C. HADEN
Patrick C. Haden
Director
April 2, 2002
/s/
JAMES J. SHELTON
James J. Shelton
Director
April 3, 2002
/s/
DANIEL A. WHALEN
Daniel A. Whalen
Director
April 2, 2002
II-4
QuickLinks
FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
PART II INFORMATION REQUIRED IN THE REGISTRATION STATEMENT
Item 3. Incorporation of Documents by Reference.
Item 4. Description of Securities.
Item 5. Interests of Named Experts and Counsel.
Item 6. Indemnification of Directors and Officers.
Item 7. Exemptions from Registration Claimed.
Item 8. Exhibits.
Item 9. Undertakings.
SIGNATURES
POWER OF ATTORNEY