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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:18.0pt;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:18.0pt;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>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">FORM&nbsp;8-K</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman">&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;">CURRENT
  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>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman">&nbsp;</font></p>
  
  <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;">April&nbsp;30,
  2008</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">TETRA
  TECH, 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>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>
  
  <div align="center">
  
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    <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.0%;">
    <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;">Delaware</font></b></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
    </td>
    <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.0%;">
    <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;">0-19655</font></b></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
    </td>
    <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.0%;">
    <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;">95-4148514</font></b></p>
    </td>
   </tr>
   <tr>
    <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.0%;">
    <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>
    <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.0%;">
    <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>
    <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.0%;">
    <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>
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  </div>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>
  
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   <tr>
    <td width="720" valign="top" style="padding:0in 0in 0in 0in;width:7.5in;">
    <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;">3475 East Foothill
    Boulevard, Pasadena, California&nbsp; 91107</font></b></p>
    </td>
   </tr>
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    <td width="720" valign="top" style="padding:0in 0in 0in 0in;width:7.5in;">
    <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 and
    zip code)</font></p>
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    <td width="720" valign="top" style="padding:0in 0in 0in 0in;width:7.5in;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
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    <td width="720" valign="top" style="padding:0in 0in 0in 0in;width:7.5in;">
    <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;">(626) 351-4664</font></b></p>
    </td>
   </tr>
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    <td width="720" valign="top" style="padding:0in 0in 0in 0in;width:7.5in;">
    <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>
    </td>
   </tr>
   <tr>
    <td width="720" valign="top" style="padding:0in 0in 0in 0in;width:7.5in;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
   </tr>
   <tr>
    <td width="720" valign="top" style="padding:0in 0in 0in 0in;width:7.5in;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><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 (see General Instruction A.2. below):</font></p>
    </td>
   </tr>
   <tr>
    <td width="720" valign="top" style="padding:0in 0in 0in 0in;width:7.5in;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
   </tr>
   <tr>
    <td width="720" valign="top" style="padding:0in 0in 0in 0in;width:7.5in;">
    <p align="left" style="font-size:10.0pt;margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font>&nbsp;&nbsp;&nbsp; Written
    communications pursuant to Rule&nbsp;425 under the Securities Act (17 CFR
    230.425)</p>
    </td>
   </tr>
   <tr>
    <td width="720" valign="top" style="padding:0in 0in 0in 0in;width:7.5in;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
   </tr>
   <tr>
    <td width="720" valign="top" style="padding:0in 0in 0in 0in;width:7.5in;">
    <p align="left" style="font-size:10.0pt;margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font>&nbsp;&nbsp;&nbsp; Soliciting
    material pursuant to Rule&nbsp;14a-12 under the Exchange Act (17 CFR 240.14a-12)</p>
    </td>
   </tr>
   <tr>
    <td width="720" valign="top" style="padding:0in 0in 0in 0in;width:7.5in;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
   </tr>
   <tr>
    <td width="720" valign="top" style="padding:0in 0in 0in 0in;width:7.5in;">
    <p align="left" style="font-size:10.0pt;margin:0in 0in .0001pt .25in;text-align:left;text-indent:-.25in;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font>&nbsp;&nbsp;&nbsp; Pre-commencement
    communications pursuant to Rule&nbsp;14d-2(b)&nbsp;under the Exchange Act
    (17&nbsp;CFR&nbsp;240.14d-2(b))</p>
    </td>
   </tr>
   <tr>
    <td width="720" valign="top" style="padding:0in 0in 0in 0in;width:7.5in;">
    <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
   </tr>
   <tr>
    <td width="720" valign="top" style="padding:0in 0in 0in 0in;width:7.5in;">
    <p align="left" style="font-size:10.0pt;margin:0in 0in .0001pt .25in;text-align:left;text-indent:-.25in;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font>&nbsp;&nbsp;&nbsp; Pre-commencement
    communications pursuant to Rule&nbsp;13e-4(c)&nbsp;under the Exchange Act
    (17&nbsp;CFR&nbsp;240.13e-4(c))</p>
    </td>
   </tr>
  </table>
  
  <div style="border:none;border-bottom:double windowtext 6.0pt;padding:0in 0in 0in 0in;">
  
  <p align="left" style="border:none;margin:0in 0in .0001pt;padding:0in;text-align:left;"><font size="2" face="Times New Roman">&nbsp;</font></p>
  
  </div>
  
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;"><font size="2" face="Times New Roman">&nbsp;</font></p>
  
  <div align="left" style="margin:0in 0in .0001pt;text-align:left;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>
  
  </div>
  <!-- SEQ.=1,FOLIO='',FILE='C:\JMS\brosent\08-13112-1\task2907945\13112-1-ba.htm',USER='brosent',CD='Apr 30 20:24 2008' -->
  
  
  <br clear="all" style="page-break-before:always;">
  
  
  <div style="font-family:Times New Roman;">
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman">&nbsp;</font></p>
  
  <h6 align="left" style="font-size:10.0pt;margin:0in 0in .0001pt;page-break-after:auto;text-align:left;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">Item 2.02.</font></b><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;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Results
  of Operations and Financial Condition.</h6>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-indent:1.0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">On April&nbsp;30, 2008, Tetra Tech,&nbsp;Inc.
  (the &#147;Registrant&#148;) reported its results of operations for its second quarter
  ended March&nbsp;30, 2008.&#160; 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>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-indent:1.0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The information contained herein and in the
  accompanying exhibit shall not be incorporated by reference into any filing of
  the Registrant, whether made before or after the date hereof, regardless of any
  general incorporation language in such filing, unless expressly incorporated by
  specific reference to such filing.&#160; The
  information in this Current Report, including the exhibit hereto, shall not be
  deemed to be &#147;filed&#148; for the purposes of Section&nbsp;18 of the Securities
  Exchange Act of 1934, as amended, or otherwise subject to the liabilities of
  that Section&nbsp;or Sections 11 and 12(a)(2)&nbsp;of the Securities Act of
  1933, as amended.</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>
  
  <h6 align="left" style="font-size:10.0pt;margin:0in 0in .0001pt;page-break-after:avoid;text-align:left;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">Item 9.01.</font></b><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;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Financial
  Statements and Exhibits.</h6>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>
  
  <p style="font-size:10.0pt;margin:0in 0in .0001pt;text-indent:1.0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(d)</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;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Exhibits</p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>
  
  <p style="font-size:10.0pt;margin:0in 0in .0001pt 2.0in;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">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;&#160;&#160;&#160;&#160;&#160; </font>Press Release, dated April&nbsp;30,
  2008, reporting the results of operations for the Registrant&#146;s second quarter
  ended March&nbsp;30, 2008.</p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2</font></p>
  
  <div style="margin:0in 0in .0001pt;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>
  
  </div>
  <!-- SEQ.=1,FOLIO='2',FILE='C:\JMS\brosent\08-13112-1\task2907945\13112-1-ba.htm',USER='brosent',CD='Apr 30 20:24 2008' -->
  
  
  <br clear="all" style="page-break-before:always;">
  
  
  <div>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman">&nbsp;</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;">SIGNATURES</font></b></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>
  
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:1.0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">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>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>
  
  <table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
   <tr>
    <td width="4%" valign="top" style="padding:0in 0in 0in 0in;width:4.76%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="41%" valign="top" style="padding:0in 0in 0in 0in;width:41.18%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.0%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="51%" valign="top" style="padding:0in 0in 0in 0in;width:51.06%;">
    <p style="margin:0in 0in .0001pt 30.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">TETRA TECH, INC.</font></p>
    </td>
   </tr>
  </table>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>
  
  <table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
   <tr>
    <td width="4%" valign="top" style="padding:0in 0in 0in 0in;width:4.76%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Date:</font></p>
    </td>
    <td width="38%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:38.16%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;&nbsp;&nbsp;April&nbsp;30, 2008</font></p>
    </td>
    <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.02%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.0%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By:</font></p>
    </td>
    <td width="51%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:51.06%;">
    <p style="margin:0in 0in .0001pt 30.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/S/ DAN L. BATRACK</font></p>
    </td>
   </tr>
   <tr>
    <td width="4%" valign="top" style="padding:0in 0in 0in 0in;width:4.76%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="41%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:41.18%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.0%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="51%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:51.06%;">
    <p style="margin:0in 0in .0001pt 30.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Dan L. Batrack</font></p>
    </td>
   </tr>
   <tr>
    <td width="4%" valign="top" style="padding:0in 0in 0in 0in;width:4.76%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="41%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:41.18%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.0%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
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    <p style="margin:0in 0in .0001pt 30.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Chairman and Chief Executive Officer</font></p>
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metadata_documents: [{"type": "8-K", "sequence": "1", "filename": "a08-13112_18k.htm", "description": "8-K", "secsgml_size_bytes": 21353}]
metadata_filer: {"company-data": {"conformed-name": "TETRA TECH INC", "cik": "0000831641", "assigned-sic": "8711", "irs-number": "954148514", "state-of-incorporation": "DE", "fiscal-year-end": "0930"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "000-19655", "film-number": "08791692"}, "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"}}
text: 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):
  April 30,
  2008
  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 and
    zip code)
  (626) 351-4664
  (Registrant's telephone number, including
    area code)
  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 (see General Instruction A.2. below):
  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 2.02.
  Results
  of Operations and Financial Condition.
  On April 30, 2008, Tetra Tech, Inc.
  (the "Registrant") reported its results of operations for its second quarter
  ended March 30, 2008.  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.
  The information contained herein and in the
  accompanying exhibit shall not be incorporated by reference into any filing of
  the Registrant, whether made before or after the date hereof, regardless of any
  general incorporation language in such filing, unless expressly incorporated by
  specific reference to such filing.  The
  information in this Current Report, including the exhibit hereto, shall not be
  deemed to be "filed" for the purposes of Section 18 of the Securities
  Exchange Act of 1934, as amended, or otherwise subject to the liabilities of
  that Section or Sections 11 and 12(a)(2) of the Securities Act of
  1933, as amended.
  Item 9.01.
  Financial
  Statements and Exhibits.
  (d)
  Exhibits
  99.1
  Press Release, dated April 30,
  2008, reporting the results of operations for the Registrant's second quarter
  ended March 30, 2008.
  2
  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:
  April 30, 2008
  By:
  /S/ DAN L. BATRACK
  Dan L. Batrack
  Chairman and Chief Executive Officer
  3