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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(Print or Type Responses)

1. Name and Address of Reporting Person * BIEBER MICHAEL 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) SENIOR VICE PRESIDENT (Last) (First) (Middle) 3475 EAST FOOTHILL BOULEVARD 3. Date of Earliest Transaction (Month/Day/Year) 02/25/2015 (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 02/25/2015   M   16,750 A $ 16.98 27,546 D   COMMON STOCK 02/25/2015   M   16,750 A $ 23.68 44,296 D   COMMON STOCK 02/25/2015   M   11,397 A $ 23.48 55,693 D   COMMON STOCK 02/25/2015   S   44,897 D $ 25.2005 (1) 10,796 D   COMMON STOCK 02/26/2015   M   5,353 A $ 23.48 16,149 D   COMMON STOCK 02/26/2015   M   12,563 A $ 22.53 28,712 D   COMMON STOCK 02/26/2015   M   5,000 A $ 24.26 33,712 D   COMMON STOCK 02/26/2015   S   22,916 D $ 25.2218 (2) 10,796 D

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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

EMPLOYEE STOCK OPTION (RIGHT TO BUY)

$ 16.98

02/25/2015

M

16,750

11/14/2009(3)

11/14/2016

COMMON STOCK

16,750

$ 0

0

D

EMPLOYEE STOCK OPTION (RIGHT TO BUY)

$ 23.68

02/25/2015

M

16,750

11/16/2008(4)

11/16/2015

COMMON STOCK

16,750

$ 0

0

D

EMPLOYEE STOCK OPTION (RIGHT TO BUY)

$ 23.48

02/25/2015

M

11,397

11/12/2011(5)

11/12/2018

COMMON STOCK

11,397

$ 0

5,353

D

EMPLOYEE STOCK OPTION (RIGHT TO BUY)

$ 23.48

02/26/2015

M

5,353

11/12/2011(5)

11/12/2018

COMMON STOCK

5,353

$ 0

0

D

EMPLOYEE STOCK OPTION (RIGHT TO BUY)

$ 22.53

02/26/2015

M

12,563

11/11/2012(6)

11/11/2019

COMMON STOCK

12,563

$ 0

0

D

EMPLOYEE STOCK OPTION (RIGHT TO BUY)

$ 24.26

02/26/2015

M

5,000

11/16/2013(7)

11/16/2020

COMMON STOCK

5,000

$ 0

0

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
BIEBER MICHAEL A 3475 EAST FOOTHILL BOULEVARD PASADENA,, CA 91107			SENIOR VICE PRESIDENT

Signatures

JANIS SALIN for MICHAEL A. BIEBER		02/27/2015
**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 price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.20-$25.21, inclusive.
(2)	The price reported in the column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.20-$25.2725, inclusive.
(3)	The option was fully vested as of November 14, 2012.
(4)	The option was fully vested as of November 16, 2011.
(5)	The option was fully vested as of November 12, 2014.
(6)	A total of 12,563 shares from the option dated November 11, 2011 were vested as of November 11, 2014.
(7)	A total of 5,000 shares from the option dated November 16, 2012 were vested as of November 16, 2014.

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