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 Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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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) Executive Vice President (Last) (First) (Middle) 3475 EAST FOOTHILL BOULEVARD 3. Date of Earliest Transaction (Month/Day/Year) 11/20/2015 (Street) PASADENA,, CA 91107 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction 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 11/20/2015   D   1,333 (2) D $ 0 24,103 D   COMMON STOCK 11/20/2015   A   3,224 (3) A $ 0 27,327 D   COMMON STOCK 11/21/2015   F   290 (4) D $ 27.16 27,037 D   COMMON STOCK 11/22/2015   A   635 (5) A $ 0 27,672 D   COMMON STOCK 11/22/2015   F   836 (6) D $ 27.16 26,836 D   COMMON STOCK 11/22/2015   F   224 (7) D $ 27.16 26,612 D

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction 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 (Month/Day/Year)

7. Title and Amount of Underlying Securities (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)

$ 27.16

11/20/2015

A

10,887

11/20/2016(1)

11/20/2025

COMMON STOCK

10,887

$ 0

10,887

D

Reporting Owners

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

Signatures

Janis B. Salin for Richard A. Lemmon		11/24/2015
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(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).
(1)	The option becomes exercisable as to 25% of the shares on each anniversary of the grant date.
(2)	In accordance with the Executive Compensation Policy, 1,333 shares of restricted stock granted on 11/16/2012 were canceled on 11/20/2015 when certain performance conditions were not achieved.
(3)	3,224 restricted stock units (RSUs) were awarded to the reporting person on November 20, 2015. The RSUs become vested as to 25% of the shares on each anniversary of the grant date.
(4)	290 of the shares underlying RSUs which vested on 11/21/2015 were withheld to pay the related tax liability.
(5)	In accordance with the Executive Compensation Policy, 140% of one restricted stock installment granted on 11/22/2013 became vested on 11/22/2015, and 635 addtional shares were issued to the reporting person.
(6)	836 of the shares underlying restricted stock which vested on 11/22/2015 were withheld to pay the related tax liability.
(7)	224 of the shares underlying RSUs which vested on 11/22/2015 were withheld to pay the related tax liability.

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