| | | | | | | | |
| 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 |
| 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 |
