Tetra Tech, Inc.

Tetra Tech, Inc., doing business as Tetra TECH, is a large for-profit environmental consulting and engineering firm headquartered in Pasadena, California, that serves as a prime contractor on federal Superfund site remediation, environmental assessment, and emergency response programs, competing unrestricted (no set-asides) across multiple EPA regions and the Army Corps of Engineers. The firm operates predominantly as a prime (95% of recent awards) and holds two major indefinite-delivery vehicles anchoring its EPA footprint: a $73.3 million Superfund Technical Assessment and Response Team VI (START VI) contract with EPA Region 5 (awarded November 2024, through November 2029) and a $450 million Superfund and Great Lakes Architecture & Engineering Services (SFGLAES) contract with EPA Region 5 (awarded September 2023, through September 2028).

Tetra Tech's customer concentration is heavily weighted toward EPA Region 5 environmental remediation work. EPA Region 5 accounts for 111 awards valued at $853.1 million combined potential value, while EPA Region 3 carries 7 awards worth $882.8 million—the highest dollar concentration but smallest award count—with remaining work split across EPA Regions 4, 9, and 10, and the Army Corps of Engineers (New England District). Within EPA Region 5, Tetra Tech's work encompasses site investigations, groundwater and soil sampling, monitoring well installation, remedial design planning, vapor intrusion mitigation, construction oversight, emergency environmental response, and administrative overhead support across Great Lakes Superfund sites. Representative prime awards include a $15.04 million delivery order for East Palestine train derailment emergency response and cleanup under START VI (June 2025), an $8.21 million order for remedial investigation, feasibility study, and remedial design at Federated Metals Corp. Whiting in Hammond, Indiana under SFGLAES (September 2024), a $5.06 million order for field oversight at the Eastern Michaud Flats Superfund Site in Idaho under the EPA Remedial Acquisition Framework: Design and Engineering Services (RAF DES) with EPA Region 10 (February 2026), and a $5.84 million removal activities order under START VI (December 2024). Most delivery orders operate on a time-and-materials or cost-plus-fixed-fee basis.

Vehicle participation extends across five parent IDIQs: Superfund Technical Assessment Response Team V (56 task orders, $89.1 million), the START VI indefinite-delivery contract (22 task orders under contract number 68HE0525D0004, $36 million), Superfund Technical Assessment Response Team IV (22 task orders, $42.6 million), EPA Remedial Acquisition Framework: Design and Engineering Services (7 task orders, $20.1 million), and a fifth indefinite-delivery vehicle (5 task orders, $40.8 million). Activity has grown modestly—from 11 awards in 2022 to 17 in 2025—with 16 awards (combined potential value $49 million) reaching ultimate completion within the next twenty-four months and therefore facing recompete exposure. Total awards stand at 129 across all federal sources with combined potential value of $1.75 billion, though only $219.4 million (13% of potential) has been obligated.

On subcontractor engagement, Tetra Tech performs most work internally. Across SCI-reportable prime contracts, subcontractors account for an average of 8 percent of total contractor hours, with five named subcontractors appearing in the SCI dataset. In its subcontractor role (5% of recent awards), Tetra Tech delivers environmental and site restoration services to Environmental Quality Management, Inc. on Callahan Mine Superfund Site sediment removal work in Maine (December 2023 and May 2024) and participates as a sub-recipient on federal grant work including invasive carp removal, Management Response Plan development, and angler/commercial fisher black carp incentive programs (sub-awards dated April 2026). Named subcontractors on Tetra Tech's prime work include ALS Group USA Corporation and Als Environmental for laboratory analysis, Cascade Drilling for subsurface investigations and drilling, Beacon Environmental Services for environmental assessment, Field Environmental Instruments Inc. for equipment rental, and Mannik & Smith Group, Inc. for field investigation labor on SFGLAES projects. SCI-reported invoicing on prime federal services contracts totaled $2.7 million in FY2024 across 11.4 FTEs, with government-paid hourly rates running a median of $112.54/hr and ranging from the 10th percentile at $88.57/hr to the 90th percentile at $160.99/hr—consistent with mid-to-senior-level environmental engineering and technical assessment labor.