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Proxy Statement Pursuant to Section 14(a) of

the Securities Exchange Act of 1934 (Amendment No.                    )


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o Preliminary Proxy Statement
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¨ Definitive Proxy Statement
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Tetra Tech, Inc.
(Name of Registrant as Specified In Its Charter)
(Name of Person(s) Filing Proxy Statement, if other than the Registrant)
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Your Vote Counts! TETRA TECH, INC. C/O COMPUTERSHARE P.O. BOX 43070 PROVIDENCE, RI 02940-3070 TETRA TECH, INC. 2022 Annual Meeting Vote by February 28, 2022 11:59 PM ET You invested in TETRA TECH, INC. and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy material for the stockholder meeting to be held on March 1, 2022. Get informed before you vote View the Notice and Proxy Statement, Annual Report and Shareholder Letter online OR you can receive a free paper or email copy of the material(s) by requesting prior to February 15, 2022. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy. Vote in Person at the Meeting* March 1, 2022 10:00 AM Pacific Time The Westin Pasadena 191 North Los Robles Avenue Pasadena, CA 91101 *Please check the meeting materials for any special requirements for meeting attendance. At the meeting, you will need to request a ballot to vote these shares. Smartphone users Point your camera here and vote without entering a control number V1.1 For complete information and to vote, visit www.ProxyVote.com Control # D63990-P64875


THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming stockholder meeting. Please follow the instructions on the reverse side to vote these important matters. Vote at www.ProxyVote.com Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Sign up for E-delivery”. Voting Items Board Recommends D63991-P64875 1. Election of Directors Nominees: 1c. J. Christopher Lewis 1a. Dan L. Batrack 1d. Joanne M. Maguire 1b. Gary R. Birkenbeuel 1e. Kimberly E. Ritrievi 1f. J. Kenneth Thompson 1g. Kirsten M. Volpi 2. To approve, on an advisory basis, the Company’s executive compensation; 3. To ratify the appointment of PricewaterhouseCoopers LLP as the Company’s independent registered public accounting firm for fiscal year 2022. NOTE: In their discretion, the proxies are authorized to vote on such other business as may properly come before the meeting or any postponement or adjournment thereof. For For For For For For For For For

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