EXHIBIT 23.1






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 and Registration 
Statement No. 333-26199 on Form S-3 of Tetra Tech, Inc. of our report dated 
August 8, 1997 appearing in this Form 8-K/A.


/s/ DELOITTE & TOUCHE LLP

Los Angeles, California
September 18, 1997