Statement of Changes in Beneficial Ownership (4)

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	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response... 0.5
	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 * Teufele Bernard	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, CSA Division
(Last)          (First)          (Middle) 14940 123 AVENUE	3. Date of Earliest Transaction (MM/DD/YYYY) 11/17/2017
(Street) EDMONTON, A0 T5V 1B4 (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	11/17/2017		A		1720   (1)	A	$0	7476	D
COMMON STOCK	11/18/2017		F		85   (2)	D	$47.95	7391	D
COMMON STOCK	11/20/2017		F		85   (3)	D	$48.55	7306	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	11/17/2017		A		5580		11/17/2018   (4)	11/17/2027	COMMON STOCK	5580.0	$0	5580	D

Explanation of Responses:
(1)	1,720 restricted stock units (RSUs) were awarded to the reporting person on November 17, 2017. The RSUs become vested as to 25% of the shares on November 18, 2018, and the anniversary of that date going forward until fully vested.
(2)	85 of the shares underlying restricted stock which vested on 11/18/2017 were withheld to pay the related tax liability.
(3)	85 of the shares underlying restricted stock which vested on 11/20/2017 were withheld to pay the related tax liability.
(4)	The option becomes exercisable as to 25% of the Shares on each anniversary of the grant date.

Reporting Owners
Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Teufele Bernard 14940 123 AVENUE EDMONTON, A0 T5V 1B4			SVP, CSA Division

Signatures
JANIS B. SALIN FOR BERNARD TEUFELE		11/21/2017
** 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 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).
Note:	File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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