Tetra Tech, Inc.

Tetra Tech, Inc. (Fairfax, Virginia division), a wholly owned subsidiary of Tetra Tech parent company headquartered in Pasadena, California, is a large for-profit environmental and engineering consulting firm that competes as a prime contractor on full-and-open federal water quality, ecological assessment, and infrastructure support contracts, with no use of set-aside categories across its footprint. The vendor operates without small business designations and generates substantial federal contracting volume through single-award and multiple-award indefinite delivery vehicles across the Environmental Protection Agency, the Army Corps of Engineers, and the Department of Defense.

The vendor's core capabilities center on water quality standards development and regulatory support, ecological and aquatic biological assessment, environmental data management and modeling, harmful algal bloom and contaminant risk characterization, TMDL (Total Maximum Daily Load) development, and climate change impact research on water systems. Representative delivery orders under the EPA's $100.5 million Office of Research and Development IDIQ (68HERC20D0016, extended through September 2027) include $819,074.90 for District of Columbia bacteria TMDL modeling and development under time-and-materials pricing; $666,162.89 for Chesapeake Solutions-Driven Research coastal resiliency using blue carbon products; $677,714 for organon case studies and biomonitoring for resilience; and multiple orders for National Coastal Condition Assessment (NCCA) planning, sample collection, and benthic quality assurance work totaling over $1.9 million combined. Under the same parent IDV, the vendor delivers ecological and climate assessment research spanning PFAS spatial analysis, enhanced efficiency fertilizer assessment using SWAT hydrologic modeling, cyanobacterial bloom vulnerability screening for public water systems, microplastics pathway tracking, and aquatic ecosystem stressor identification.

Customer concentration is severe and anchored by the EPA. The EPA Office for Water and its regional offices account for $598.3 million across 223 awards (44% of the vendor's combined potential value by dollars), while the EPA Office of Research and Development carries $89.3 million across 78 awards. Together, EPA entities represent roughly 60% of the vendor's recent prime footprint by dollar volume and over 40% by award count. The Department of the Army Corps of Engineers Engineering District Mobile ranks second by dollars ($364.2 million across 98 awards) but carries substantially lower unit values, reflecting smaller engineering and environmental compliance task orders. The Army, EPA regions (3, 8, 9, 10, and Region 2), and the Defense Health Agency comprise the remainder of the top customer set; no other customer agency exceeds 2% of recent award volume.

The vendor sits on five primary parent vehicles. Indefinite Delivery Contract 68C02108 (EPA, unspecified function from source) carries 178 task orders and $26.8 million combined potential value. Contract EPC08004 (EPA, ecological assessment work) carries 112 task orders and $51.7 million. The flagship EPA Office of Research and Development IDIQ 68HERC20D0016 carries 58 named task orders and $20.8 million in the source slice. Contract EPC17031 (EPA ORD predecessor contract, expired September 2022) shows 48 task orders and $7.6 million. Army Corps contract W912HN08D0015 carries 46 task orders and $5.1 million. All are single-award vehicles with no competition; task order issuance is Tetra Tech's primary mechanism for scaling delivery under these vehicles.

Activity has contracted significantly. Award volume peaked at 25 in 2023 and 20 in 2022, declining to 14 in 2024, 10 in 2025, and 3 through April 2026 — a trajectory suggesting either delayed reporting in 2026 or a sharp downturn. Recompete exposure is modest: only 6 awards with combined potential value of $8.3 million reach ultimate completion within the next twenty-four months, indicating the vendor's near-term pipeline is concentrated in non-expiring work under the two flagship EPA IDIQs.

Service Contract Inventory reporting covers 81 records (75 prime, 6 sub) across fiscal years 2022–2024 and captures only service contracts above the $150,000 reporting threshold, excluding goods, products, and non-federal revenue. SCI-reported invoicing totaled $12.5 million across the three-year period, declining from $6 million in FY2022 to $2.2 million in FY2024. Federal FTE delivery ranged from 17.4 FTEs in FY2022 to 10.1 FTEs in FY2024, consistent with the activity decline. Government-paid hourly rates on SCI-reportable prime contracts ran median $152.05 per hour, with senior technical labor commanding rates through $295.62 per hour and junior or support labor falling to the 10th percentile around $86.29 per hour. Across SCI-reportable prime contracts, subcontractors performed 4% of total contractor hours on average, with 16 named subs identified; the vendor predominantly self-performs delivery. Recent subcontract activity includes work under University of California San Diego (as sub-grantee under a National Science Foundation IOOS program via Axiom, a Tetra Tech subsidiary), Arkansas Natural Resources Commission, and Chesapeake Bay Trust as prime grantees, though these represent grant sub-receipts rather than contract subs. The vendor's EPA grant sub-award work centers on data management, nutrient reduction strategy design, and stream health indicator development, positioned as technical support to state and nonprofit prime recipients.

The vendor operates at the low end of recompete risk in absolute dollars but faces a concentration hazard: over 300 awards and more than 40% of recent revenue flow through two EPA single-award IDIQs expiring in 2027 and 2031, making performance stability and task order velocity under those vehicles the primary determinant of forward federal revenue. The decline in award velocity since 2023 may signal delayed new task order issuance or customer budget constraints rather than competitive loss, but SCI-reported labor delivery has fallen correspondingly, warranting close monitoring.