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Subsidiaries of Tetra Tech, Inc.

NAME						JURISDICTION OF FORMATION
Advanced Management Technology, Inc.						Virginia
American Environmental Group, Ltd.						Ohio
ARD, Inc.						Vermont
Ardaman & Associates, Inc.						Florida
Axiom Data Science, LLC						Alaska
BlueWater Federal Solutions, Inc.						Delaware
Cosentini Associates, Inc.						New York
Glumac						California
Hoare Lea LLP						United Kingdom
INDUS Corporation						Virginia
Management Systems International, Inc.						District of Columbia
PRO-telligent, LLC						Delaware
Rooney Engineering, Inc.						Colorado
Tetra Tech BAS, Inc.						California
Tetra Tech Canada Holding Corporation						Canada
Tetra Tech Canada, Inc.						Canada
Tetra Tech Coffey Pty Ltd.						Australia
Tetra Tech Construction, Inc.						New York
Tetra Tech EC, Inc.						Delaware
Tetra Tech ES, Inc.						Delaware
Tetra Tech Executive Services, Inc.						California
Tetra Tech Holding LLC						Delaware
Tetra Tech Holdings Pty Ltd.						Australia
Tetra Tech Limited						United Kingdom
Tetra Tech Tesoro, Inc.						Virginia
Tetra Tech UK Holdings Limited						United Kingdom