| | | | | | | | |
| Subsidiaries of Tetra Tech, Inc. |
| | |
| NAME | | JURISDICTION OF FORMATION |
| Advanced Management Technology, Inc. | | Virginia |
| American Environmental Group, Ltd. | | Ohio |
| Amyx, Inc. | | Delaware |
| ARD, Inc. | | Vermont |
| Ardaman & Associates, Inc. | | Florida |
| BlueWater Federal Solutions, Inc. | | Delaware |
| Cosentini Associates, Inc. | | New York |
| Global Tech Inc. | | Virginia |
| 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 |
| RPS AAP Consulting Pty Ltd | | Australia |
| R P S Group Limited | | United Kingdom |
| Segue Technologies, Inc. | | Virginia |
| Tetra Tech Australia Pty Ltd | | Australia |
| 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 EMC, Inc. | | California |
| Tetra Tech ES, Inc. | | Delaware |
| Tetra Tech Executive Services, Inc. | | California |
| Tetra Tech Holding LLC | | Delaware |
| Tetra Tech Holdings Pty Ltd. | | Australia |
| Tetra Tech International Development Pty Ltd | | Australia |
| Tetra Tech Limited | | United Kingdom |
| Tetra Tech RPS Energy Pty Ltd | | Australia |
| Tetra Tech Tesoro, Inc. | | Virginia |
| Tetra Tech UK Holdings Limited | | United Kingdom |
| The Kaizen Company, LLC | | District of Columbia |