Tetra Tech, Inc.

Tetra Tech, Inc., doing business as Tetra TECH Em Inc., is a large environmental consulting and engineering firm headquartered in Pasadena, California (with a subsidiary structure centered in Oakland, California) that serves as a prime contractor on federal environmental remediation, site assessment, and engineering services contracts with no set-aside designations, complemented by selective subcontractor roles on Army environmental programs.

Tetra Tech Em Inc. operates primarily under two dominant Navy indefinite delivery contracts that account for the vast majority of task orders, with the Environmental Protection Agency Region 9 anchoring the largest dollar concentration through the Navajo Area Uranium Mines Response Assessment and Evaluation Services II (NAUMRAES II) single-award IDIQ. The EPA Region 9 customer relationship dominates the dollar footprint: 69 awards carry a combined potential value of $437.7 million, centered on uranium mine assessment and remediation services across EPA Regions 6 and 9 in the Southwest. The company holds a $98 million single-award IDIQ with EPA Region 9 for uranium-mine technical assessment (awarded April 2023, extending through April 2028), under which over 30 delivery orders have been issued with cumulative awarded value exceeding $70 million. Representative recent prime work includes a $10.66 million delivery order for technical design and cleanup verification at Tronox abandoned uranium mines (awarded September 2023), a $20.3 million Tronox engineering evaluation and cost analysis order (July 2023), and a $6.55 million Lukachukai Mountains Mining District remedial investigation and feasibility study (August 2023). Tetra Tech also holds a $50 million multiple-award MATOC for Environmental Remediation Services from the U.S. Army Corps of Engineers (Albuquerque District, awarded September 2022, extending through September 2027), plus a recently awarded $141.25 million multiple-award Water Assessment and Technical Emergency Response (WATER) IDIQ with EPA Region 9 covering Regions 1, 2, and 3 (awarded September 2026). The company received a $277 thousand small-business-set-aside definitive contract from the Federal Aviation Administration for environmental assessment of an air route surveillance radar replacement in Hawaii (April 2025).

The top five customer agencies by award count are the Department of the Navy (907 awards, representing the Navy IDIQs), EPA Region 9 (69 awards, $437.7 million), the Army's Aviation and Missile Life Cycle Management Command (54 awards), the Department of Agriculture Forest Service Pacific Southwest Region (7 awards, $257 thousand), and the Department of Interior Bureau of Land Management California Region (7 awards, $1.4 million). Dollar concentration is more pronounced: EPA Region 9 accounts for 88% of combined potential value across the top five customers, with the Army Corps of Engineers Environmental Remediation Services MATOC contributing $50 million. The Navy IDIQs (contracts N6247488D5086 and N6247494D7609) represent 525 and 333 task orders respectively but are not itemized in the source's dollar totals, indicating they may be classified or separately tracked. Tetra Tech competes on full-and-open basis across all prime work, with no SBA set-asides in its prime portfolio.

On the EPA uranium-mine work, Tetra Tech frequently engages Native American-owned small businesses and woman-owned small businesses as subcontractors. Named subs include Iina Ba Inc. (Native American-owned, providing labor and field equipment support), Sundance Consultants LLC (Native American-owned, 8(a) Program Participant, cultural resource surveys), Gel Laboratories LLC (woman-owned small business, laboratory analytical and radiological services), Environmental Restoration Group Inc. (labor, radiological survey, and equipment rental), Environmental Data Services Limited (small disadvantaged and economically disadvantaged woman-owned small business, data validation), Validata Chemical Services Inc. (minority and woman-owned small business), Equipco Rentals (veteran-owned small business), Allterra Central Inc., Riley Engineering LLC (Native American-owned minority business), Dinetahdoo Cultural Resources LLC (Native American-owned), and Alpine Archaeological Consultants Inc. (cultural resource monitoring). Across SCI-reportable prime contracts, subcontractors account for an average of 4% of total contractor hours; Tetra Tech self-performs the large majority of delivery-order work.

SCI-reported invoicing of federal services contracts shows $52.8 million across FY2022–FY2025, with steady growth: $5.9 million in FY2022, $11.4 million in FY2023, $17.5 million in FY2024, and $18 million in FY2025. The SCI dataset reflects roughly 33 FTEs in FY2022, 25 FTEs in FY2023, 60 FTEs in FY2024, and 59 FTEs in FY2025, with the spike in FY2024 driven by high-effort EPA uranium-mine remediation work. Government-paid hourly rates on federal services contracts run a median of $134.50/hr, with senior labor pricing reaching the 90th percentile at $206.36/hr and entry rates at the 10th percentile of $95.30/hr. SCI captures a subset of EPA uranium-mine delivery orders and excludes the Navy IDIQs, which suggests the company's true federal revenue exceeds the SCI total.

As a subcontractor, Tetra Tech delivers Army environmental compliance and hazardous materials technical support to Torch Technologies Inc. on the AMCOM G-4 Environmental and Other Functions program at Redstone Arsenal, Alabama; Fort Rucker, Alabama; and Corpus Christi Army Depot, Texas, with monthly subcontract awards spanning from May 2022 through March 2025 covering weapons system acquisition, pollution prevention, HAZMAT minimization, process analysis, facilities engineering, compliance, and remediation across all AMCOM command elements. Tetra Tech also subcontracts to Parsons Government Services Inc. on a Military Ocean Terminal (MOTO) Site 40 environmental services award (March 2024).

The company faces a recompete cliff: 30 awards with combined potential value of $74.3 million carry ultimate completion dates within the next twenty-four months, centered on EPA uranium-mine delivery-order expirations and the USACE ERS MATOC option period. The active award portfolio shows recent acceleration—36 awards in FY2023, 16 in FY2024, and 8 in FY2025 (through the source snapshot date of October 15, 2026)—reflecting the continued issuance of task orders under the stable EPA and Army IDIQ vehicles rather than new prime awards.