| 2026-08-04 | usaspending | 1240LU26F0090 | TETRA TECH, INC. | $255K | 0.0 |
| 2026-07-22 | sam | Notice of Award Architect-Engineer (AE) Services to support | TETRA TECH, INC. | $249.0M | 0.6 |
| 2026-07-09 | sam | R--Region 4 Superfund Technical Assessment & Response | TETRA TECH, INC. | $63.7M | 0.4 |
| 2026-06-02 | usaspending | 68HE0526F0084 | TETRA TECH, INC. | $2.3M | 0.0 |
| 2025-08-25 | usaspending | 68HE0725F0166 | TETRA TECH, INC. | $850K | 0.0 |
| 2025-08-21 | usaspending | 68HE0825F0037 | TETRA TECH INC | $150K | 0.0 |
| 2025-05-23 | usaspending | 693KA925C00015 | ADVANCED MANAGEMENT TECHN | $14.9M | 0.2 |
| 2023-09-28 | usaspending | 12363N23F4326 | TETRA TECH, INC. | $4.7M | 0.0 |
| 2022-09-30 | usaspending | 19AQMM22F3911 | TETRA TECH, INC. | $247.6M | 0.4 |
| 2022-08-01 | usaspending | FA872322F9009 | TETRA TECH, INC. | $67.7M | 0.3 |
| 2021-12-29 | usaspending | W912DY22F0059 | TETRA TECH INC | $53.1M | 0.2 |
| 2021-12-27 | usaspending | 89303322FEM400245 | TETRA TECH, INC. | $1.4M | 0.0 |
| 2020-07-01 | usaspending | 68HE0320F0049 | TETRA TECH, INC. | $18.4M | 0.1 |
| 2020-02-05 | usaspending | 140A1620F0025 | SEGUE TECHNOLOGIES, INC | $28.5M | 0.1 |
| 2020-01-24 | usaspending | 68HE0520F0032 | TETRA TECH, INC. | $57.4M | 0.2 |
| 2019-09-17 | usaspending | 89303019FET400015 | BLUEWATER FEDERAL SOLUTIO | $80.0M | 0.2 |
| 2019-08-27 | usaspending | 693KA819F00378 | ADVANCED MANAGEMENT TECHN | $69.0M | 0.2 |
| 2019-08-25 | usaspending | HT005019F0001 | AMYX INC | $66.4M | 0.2 |
| 2019-08-18 | usaspending | HT005019F0002 | AMYX INC | $60.8M | 0.2 |
| 2018-01-24 | usaspending | 693KA718C00002 | ADVANCED MANAGEMENT TECHN | $55.5M | 0.2 |
| 2017-05-19 | usaspending | HC102817F0424 | BLUEWATER FEDERAL SOLUTIO | $65.2M | 0.2 |
| 2016-07-23 | usaspending | AID306C1600010 | TETRA TECH, INC. | $123.9M | 0.2 |
| 2005-10-27 | usaspending | AID514C000600300 | ARD, INC. | $189.2M | 0.3 |