FORM 3
        
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      
1. Name and Address of Reporting Person * Hudkins Jill 2. Date of Event Requiring Statement (MM/DD/YYYY)
5/2/2022 

3. Issuer Name and Ticker or Trading Symbol TETRA TECH INC [TTEK]
(Last)        (First)        (Middle)
3475 E. FOOTHILL BLVD.
4. Relationship of Reporting Person(s) to Issuer (Check all applicable)_____ Director                          _____ 10% Owner
___X___ Officer (give title below)        _____ Other (specify below)
President, RSI Division /
(Street)
PASADENA, CA 91107      
(City)              (State)              (Zip)
5. If Amendment, Date Original Filed(MM/DD/YYYY)
 

6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)
2. Amount of Securities Beneficially Owned
(Instr. 4)
3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)
4. Nature of Indirect Beneficial Ownership
(Instr. 5)
COMMON STOCK  4525  D   

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 4)
2. Date Exercisable and Expiration Date
(MM/DD/YYYY)
3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)
4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)
6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
RESTRICTED STOCK UNITS   (1)  (2) COMMON STOCK  106.0  $0.0  D   
RESTRICTED STOCK UNITS   (3)  (2) COMMON STOCK  145.0  $0.0  D   
RESTRICTED STOCK UNITS   (4)  (2) COMMON STOCK  461.0  $0.0  D   
RESTRICTED STOCK UNITS   (5)  (2) COMMON STOCK  750.0  $0.0  D   
RESTRICTED STOCK UNITS   (6)  (2) COMMON STOCK  796.0  $0.0  D   

Explanation of Responses:
(1)  This RSU award was granted on November 15, 2018 and vests in four substantially equal annual installments, assuming continued employment through the applicable vesting date. The award is scheduled to vest as to 106 stock units on November 15, 2022.
(2)  The RSUs are exercisable at the time of vesting and do not have a set expiration date.
(3)  This RSU award was granted on November 21, 2019 and vests in four substantially equal annual installments, assuming continued employment through the applicable vesting date. The award is scheduled to vest as to 73 stock units on November 21, 2022 and 72 stock units on November 21, 2023.
(4)  This RSU award was granted on November 19, 2020 and vests in four substantially equal annual installments, assuming continued employment through the applicable vesting date. The award is scheduled to vest as to 154 stock units on each November 19 of 2022 through 2023 and 153 stock units on November 19, 2024.
(5)  This RSU award was granted on April 26, 2021 and vests in four substantially equal installments, assuming continued employment through the applicable vesting date. The award is scheduled to vest as to 250 stock units on each April 26 of 2023 through 2025.
(6)  This RSU award was granted on November 23, 2021 and vests in four substantially equal installments beginning November 23, 2022, assuming continued employment through the applicable vesting date.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Hudkins Jill
3475 E. FOOTHILL BLVD.
PASADENA, CA 91107


President, RSI Division

Signatures
/s/ Preston Hopson, Attorney-in-Fact 5/11/2022
**Signature of Reporting Person Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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