On November 14, 2007, Tetra Tech, Inc. (the “Registrant”) reported its results of operations for its fourth quarter ended September 30, 2007.  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