FORM 4 [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
STATEMENT OF CHANGES IN 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 * LEMMON RICHARD A 2. Issuer Name and Ticker or Trading Symbol TETRA TECH INC [ TTEK ] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable)_____ Director                    _____ 10% Owner
__X__ Officer (give title below)    _____ Other (specify below)
SVP, Corporate Administration
(Last)         (First)         (Middle)
3475 EAST FOOTHILL BOULEVARD
3. Date of Earliest Transaction (MM/DD/YYYY)
2/18/2021
(Street)
PASADENA,, CA 91107
(City)       (State)       (Zip)
4. 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 Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
COMMON STOCK  2/18/2021    M    1950  A $47.95  48247 (1) D   
COMMON STOCK  2/18/2021    S    2722  D $137.25  45525  D   
COMMON STOCK  2/19/2021    M    2648  A $47.95  48173  D   
COMMON STOCK  2/19/2021    S    2648  D $138.9514 (2) 45525  D   
COMMON STOCK  2/19/2021    S    8060  D $138.9034 (3) 37465  D   

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
STOCK OPTION (RIGHT TO BUY)  $47.95  2/18/2021    M        1950   11/17/2018 (4) 11/17/2027 (5) COMMON STOCK  1950.0  $0  4180  D   
STOCK OPTION (RIGHT TO BUY)  $47.95  2/19/2021    M        2648   11/17/2018 (4) 11/17/2027 (5) COMMON STOCK  2648.0  $0  1532  D   

Explanation of Responses:
(1)  Amount of securities beneficially owned was updated to reflect that 58 shares of common stock were acquired by the Reporting Person on December 15, 2020, pursuant to the Tetra Tech, Inc. Employee Stock Purchase Plan (ESPP).
(2)  $138.9514 is an average price. Shares were sold at prices ranging from $138.79 to $139.08 per share.
(3)  $138.9034 is an average price. Shares were sold at prices ranging from $138.57 to $139.19 per share.
(4)  The option becomes exercisable as to 25% of the shares on each anniversary of the grant date.
(5)  The option granted expires 10 years after the grant date.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
LEMMON RICHARD A
3475 EAST FOOTHILL BOULEVARD
PASADENA,, CA 91107


SVP, Corporate Administration

Signatures
/s/ Preston Hopson, Attorney-in-fact for Richard A. Lemmon 2/19/2021
**Signature of Reporting Person Date
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