| | TETRA TECH, INC. | R7 START VI: SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM 6 | IDC | $94,379,918 | ENVIRONMENTAL PROTECTION AGENCY | ENVIRONMENTAL PROTECTION AGENCY | — | 541620Environmental Consulting Services | R429SUPPORT- PROFESSIONAL: EMERGENCY RESPONSE/DISASTER PLANNING/PREPAREDNESS SUPPORT | Jul 1, 2025 | Jul 1, 2025 | Jun 30, 2028 |
| | TETRA TECH, INC. | MATOC IDIQ A-E SERVICES FOR ENVIRONMENTAL DESIGN AND RELATED SERVICES | IDC | $49,500,000 | DEPT OF THE ARMY | DEPT OF THE ARMY | — | 541330Engineering Services | C219ARCHITECT AND ENGINEERING- GENERAL: OTHER | Mar 14, 2025 | Mar 14, 2025 | Sep 13, 2030 |
| | TETRA TECH, INC. | — | IDC | $225,000,000 | DEPT OF THE ARMY | DEPT OF THE ARMY | — | 541330Engineering Services | C219ARCHITECT AND ENGINEERING- GENERAL: OTHER | Aug 1, 2024 | Jul 31, 2024 | — |
| | TETRA TECH, INC. | — | IDC | $225,000,000 | DEPT OF THE ARMY | DEPT OF THE ARMY | — | 541330Engineering Services | C219ARCHITECT AND ENGINEERING- GENERAL: OTHER | Apr 16, 2021 | Apr 16, 2021 | Apr 15, 2028 |
| | TETRA TECH, INC. | SUPERFUND TECHNICAL ASSESSMENT&RESPONSE TEAM 5 (START V) CONTRACT FOR EPA REGION 7. | IDC | $76,886,123 | ENVIRONMENTAL PROTECTION AGENCY | ENVIRONMENTAL PROTECTION AGENCY | — | 541620Environmental Consulting Services | R429SUPPORT- PROFESSIONAL: EMERGENCY RESPONSE/DISASTER PLANNING/PREPAREDNESS SUPPORT | Dec 6, 2018 | Dec 6, 2018 | — |
| | TETRA TECH, INC. | — | IDC | $54,174,363 | ENVIRONMENTAL PROTECTION AGENCY | ENVIRONMENTAL PROTECTION AGENCY | — | 562910Remediation Services | F108ENVIRONMENTAL SYSTEMS PROTECTION- ENVIRONMENTAL REMEDIATION | Jun 17, 2013 | Jun 11, 2013 | — |
| | TETRA TECH, INC. | ENVIRONMENTAL SERVICES INDEFINITE DELIVERY, INDEFINITE QUANTITY CONTRACT FOR THE RESTORATION CENTER, NMFS, NOAA | IDC | $0 | NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION | NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION | — | 562910Remediation Services | C130 | Aug 31, 2011 | Aug 31, 2011 | — |
| | TETRA TECH, INC. | REQUIREMENT CONTRACT FOR A&E SERVICES | IDC | $0 | NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION | — | — | 541490Other Specialized Design Services | C211ARCHITECT AND ENGINEERING- GENERAL: LANDSCAPING, INTERIOR LAYOUT, AND DESIGNING | Mar 3, 2004 | Mar 3, 2004 | Oct 15, 2005 |