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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:16.0pt;font-weight:bold;">UNITED STATES</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:16.0pt;font-weight:bold;">SECURITIES AND EXCHANGE COMMISSION</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">WASHINGTON, D.C.&#160; 20549</font></b></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:16.0pt;font-weight:bold;">FORM&nbsp;8-K</font></b></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">CURRENT&#160; REPORT</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">Pursuant to Section&nbsp;13 or 15(d)&nbsp;of the Securities Exchange Act of 1934</font></b></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Date of Report (Date of earliest event reported):</font></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">July&nbsp;29, 2013</font></b></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:16.0pt;font-weight:bold;">TETRA TECH,&nbsp;INC.</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Exact name of registrant as specified in its charter)</font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">Delaware</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">0-19655</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">95-4148514</font></b></p>    </td>   </tr>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(State or other jurisdiction<br>   of&nbsp;incorporation)</font></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Commission<br>   File Number)</font></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(IRS Employer<br>   Identification&nbsp;Number)</font></p>    </td>   </tr>  </table>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">3475 East Foothill Boulevard, Pasadena, California&#160; 91107</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Address of principal executive office, including zip code)</font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">(626) 351-4664</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Registrant&#146;s telephone number, including area code)</font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">Not Applicable</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Former name or former address, if changed since last report)</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;text-align:justify;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Check the appropriate box below if the Form&nbsp;8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:</font></p>
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<p style="margin:0in 0in .0001pt .25in;text-indent:-.25in;"><font size="3" face="Wingdings" style="font-size:12.0pt;">o</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">Written communications pursuant to Rule&nbsp;425 under the Securities Act (17 CFR 230.425)</font></p>
<p style="margin:0in 0in .0001pt .25in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt .25in;text-indent:-.25in;"><font size="3" face="Wingdings" style="font-size:12.0pt;">o</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">Soliciting material pursuant to Rule&nbsp;14a-12 under the Exchange Act (17 CFR 240.14a-12)</font></p>
<p style="margin:0in 0in .0001pt .25in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt .25in;text-indent:-.25in;"><font size="3" face="Wingdings" style="font-size:12.0pt;">o</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">Pre-commencement communications pursuant to Rule&nbsp;14d-2(b)&nbsp;under the Exchange Act (17&nbsp;CFR&nbsp;240.14d-2(b))</font></p>
<p style="margin:0in 0in .0001pt .25in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt .25in;text-indent:-.25in;"><font size="3" face="Wingdings" style="font-size:12.0pt;">o</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">Pre-commencement communications pursuant to Rule&nbsp;13e-4(c)&nbsp;under the Exchange Act (17&nbsp;CFR&nbsp;240.13e-4(c))</font></p>
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<p style="margin:0in 0in .0001pt;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">Item   5.02.</font></b></p>    </td>
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<p style="margin:0in 0in .0001pt;text-align:justify;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">Departure of Directors or Principal Officers; Election of   Directors; Appointment of Principal Officers.</font></b></p>    </td>   </tr>  </table>
<p style="margin:0in 0in .0001pt 1.0in;text-align:justify;text-indent:-1.0in;"><font size="3" face="Times New Roman" style="font-size:12.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;text-align:justify;text-indent:.5in;"><font size="3" face="Times New Roman" style="font-size:12.0pt;">Ms.&nbsp;Kirsten M. Volpi has been elected to the Board of Directors of Tetra Tech,&nbsp;Inc. (the &#147;Registrant&#148;), effective July&nbsp;29, 2013, to serve until the next Annual Meeting of Stockholders or until her successor has been duly chosen and qualified.&#160; Ms.&nbsp;Volpi filled a vacancy on the Board, and the Board now consists of eight members, including Ms.&nbsp;Volpi.&#160; She will serve on the Audit Committee of the Board.&#160; Pursuant to the Registrant&#146;s compensation policy for non-employee directors, Ms.Volpi received in connection with her election (i)&nbsp;a pro rata portion of the annual cash retainer for 2013, and (ii)&nbsp;a non-qualified option to purchase 8,000 shares of common stock under the Registrant&#146;s 2005 Equity Incentive Plan at $23.52 per share, the fair market value (closing price) of a share of common stock on the grant date.</font></p>
<p style="margin:0in 0in .0001pt;text-align:justify;text-indent:.5in;"><font size="3" face="Times New Roman" style="font-size:12.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;text-align:justify;text-indent:.5in;"><font size="3" face="Times New Roman" style="font-size:12.0pt;">Ms.&nbsp;Volpi serves at the Colorado School of Mines as the Executive Vice President for Finance and Administration, Chief Financial Officer, and Treasurer. She previously served on the U.S. Olympic Committee as the Chief Administrative Officer.&#160; In previous positions, Ms.&nbsp;Volpi served in various financial management roles for Rensselaer Polytechnic Institute, the University of Colorado Foundation and the American Water Works Association.&#160; Ms. Volpi holds a Bachelor of Science in Accounting from the University of Colorado and is a Certified Public Accountant.</font></p>
<p style="margin:0in 0in .0001pt;text-align:justify;text-indent:.5in;"><font size="3" face="Times New Roman" style="font-size:12.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;text-align:justify;text-indent:.5in;"><font size="3" face="Times New Roman" style="font-size:12.0pt;">A copy of the press release issued by the Registrant concerning the foregoing is furnished herewith as Exhibit&nbsp;99.1 and is incorporated herein by reference.</font></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;text-align:justify;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">Item 9.01.&#160;&#160;&#160;&#160;&#160;&#160; Financial Statements and Exhibits.</font></b></p>
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<p style="margin:0in 0in .0001pt;text-indent:1.0in;"><font size="3" face="Times New Roman" style="font-size:12.0pt;">(d)&#160;&#160;&#160;&#160;&#160;&#160; Exhibits</font></p>
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<p style="font-size:12.0pt;margin:0in 0in .0001pt 2.0in;text-align:justify;text-indent:-.5in;"><font size="3" face="Times New Roman" style="font-size:12.0pt;">99.1</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Press Release dated July&nbsp;30, 2013 regarding the election of Kirsten M. Volpi to the Registrant&#146;s Board of Directors.</p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="3" face="Times New Roman" style="font-size:12.0pt;">2<a name="PB_2_215420_7056"></a></font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">SIGNATURES</font></b></p>
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<p style="margin:0in 0in .0001pt;text-align:justify;text-indent:1.0in;"><font size="3" face="Times New Roman" style="font-size:12.0pt;">Pursuant to the requirements of the Securities Exchange Act of 1934, the&nbsp;registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.</font></p>
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<p style="margin:0in 0in .0001pt;"><font size="3" face="Times New Roman" style="font-size:12.0pt;">TETRA TECH,&nbsp;INC.</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="3" face="Times New Roman" style="font-size:12.0pt;">Date:</font></p>    </td>
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<p style="margin:0in 0in .0001pt 20.0pt;text-indent:-10.0pt;"><font size="3" face="Times New Roman" style="font-size:12.0pt;">July&nbsp;30,   2013</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="3" face="Times New Roman" style="font-size:12.0pt;">By:</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="3" face="Times New Roman" style="font-size:12.0pt;">/S/ DAN L. BATRACK</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="3" face="Times New Roman" style="font-size:12.0pt;">Dan L. Batrack</font></p>    </td>   </tr>
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{"company-data": {"conformed-name": "TETRA TECH INC", "cik": "0000831641", "assigned-sic": "8711", "irs-number": "954148514", "state-of-incorporation": "DE", "fiscal-year-end": "0928"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "000-19655", "film-number": "13997174"}, "business-address": {"street1": "3475 EAST FOOTHILL BOULEVARD", "city": "PASADENA", "state": "CA", "zip": "91107", "phone": "6263514664"}, "mail-address": {"street1": "3475 EAST FOOTHILL BOULEVARD", "city": "PASADENA", "state": "CA", "zip": "91107"}}
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C.  20549
FORM 8-K
CURRENT  REPORT
Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
Date of Report (Date of earliest event reported):
July 29, 2013
TETRA TECH, INC.
(Exact name of registrant as specified in its charter)
Delaware
0-19655
95-4148514
(State or other jurisdiction
of incorporation)
(Commission
File Number)
(IRS Employer
Identification Number)
3475 East Foothill Boulevard, Pasadena, California  91107
(Address of principal executive office, including zip code)
(626) 351-4664
(Registrant's telephone number, including area code)
Not Applicable
(Former name or former address, if changed since last report)
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:
o
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
o
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
o
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
o
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Item   5.02.
Departure of Directors or Principal Officers; Election of   Directors; Appointment of Principal Officers.
Ms. Kirsten M. Volpi has been elected to the Board of Directors of Tetra Tech, Inc. (the "Registrant"), effective July 29, 2013, to serve until the next Annual Meeting of Stockholders or until her successor has been duly chosen and qualified.  Ms. Volpi filled a vacancy on the Board, and the Board now consists of eight members, including Ms. Volpi.  She will serve on the Audit Committee of the Board.  Pursuant to the Registrant's compensation policy for non-employee directors, Ms.Volpi received in connection with her election (i) a pro rata portion of the annual cash retainer for 2013, and (ii) a non-qualified option to purchase 8,000 shares of common stock under the Registrant's 2005 Equity Incentive Plan at $23.52 per share, the fair market value (closing price) of a share of common stock on the grant date.
Ms. Volpi serves at the Colorado School of Mines as the Executive Vice President for Finance and Administration, Chief Financial Officer, and Treasurer. She previously served on the U.S. Olympic Committee as the Chief Administrative Officer.  In previous positions, Ms. Volpi served in various financial management roles for Rensselaer Polytechnic Institute, the University of Colorado Foundation and the American Water Works Association.  Ms. Volpi holds a Bachelor of Science in Accounting from the University of Colorado and is a Certified Public Accountant.
A copy of the press release issued by the Registrant concerning the foregoing is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.
Item 9.01.       Financial Statements and Exhibits.
(d)       Exhibits
99.1
Press Release dated July 30, 2013 regarding the election of Kirsten M. Volpi to the Registrant's Board of Directors.
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SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
TETRA TECH, INC.
Date:
July 30,   2013
By:
/S/ DAN L. BATRACK
Dan L. Batrack
Chairman and Chief   Executive Officer
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