Exhibit 23


INDEPENDENT AUDITORS' CONSENT


We consent to the incorporation by reference in Registration Statement Nos. 
33-46240, 33-47533, 33-80606, and 33-94706 on Form S-8 of Tetra Tech, Inc. of 
our report dated March 13, 1998 appearing in this Form 8-K/A of Tetra Tech, 
Inc.



DELOITTE & TOUCHE LLP
Los Angeles, California
March 13, 1998