Exhibit 21

Subsidiaries of Tetra Tech, Inc.
NAME						JURISDICTION OF FORMATION
Advanced Management Technology, Inc.						Virginia
American Environmental Group, Ltd.						Ohio
America's Schoolhouse Consulting Services, Inc.						New York
ARD, Inc.						Vermont
Ardaman & Associates, Inc.						Florida
BIOCNG, LLC						New York
BlueWater Federal Solutions, Inc.						Delaware
Cornerstone Environmental Group, LLC						New York
Cosentini Associates, Inc.						New York
Foothills Indemnity, Inc.						Hawaii
Fort Point Associates, Inc.						Massachusetts
Global Tech Inc.						Virginia
Glumac						California
Hoare Lea LLP						United Kingdom
Hydro-Ops LLC						Delaware
INDUS Corporation						Virginia
Integrated Justice Systems International, LLC						Delaware
LDIS, LLC						Colorado
Management Systems International, Inc.						District of Columbia
PRO-telligent, LLC						Delaware
Rooney Engineering, Inc.						Colorado
Segue Technologies, Inc.						Virginia
Tetra Tech Alaska, L.L.C.						Alaska
Tetra Tech Australia Pty Ltd						Australia
Tetra Tech BAS, Inc.						California
Tetra Tech CES, LLC						Washington
Tetra Tech Coffey Holding LLC						Delaware
Tetra Tech Construction, Inc.						New York
Tetra Tech EC, Inc.						Delaware
Tetra Tech EMC, Inc.						California
Tetra Tech ES, Inc.						Delaware
Tetra Tech Executive Services, Inc.						California
Tetra Tech Expeditionary Operations, Inc.						Delaware
Tetra Tech Holding LLC						Delaware
Tetra Tech Holdings Pty Ltd.						Australia
Tetra Tech International, Inc.						Delaware
Tetra Tech MA, Inc.						Delaware
Tetra Tech MIMDU, LLC						Delaware
Tetra Tech Technical Services, Inc.						Delaware
Tetra Tech Tesoro, Inc.						Virginia
Tetra Tech UK Holdings Limited						United Kingdom
The Kaizen Company, LLC						District of Columbia