Top EPA environmental consulting services contractors
In the 12 months ending Oct 5, 2026, the Environmental Protection Agency obligated $287.8M in net prime contract dollars under NAICS 541620, down 18.1% from $351.4M in the preceding 12 months. 56 prime contractors received positive obligations, and 10 of them accounted for 80% of that spend.
Prime contracts funded by the Environmental Protection Agency. Latest 12 months: Oct 6, 2025 to Oct 5, 2026. Source: USAspending.gov.
Obligations by fiscal year
Net prime contract obligations by federal fiscal year (October to September).
Top EPA contractors for NAICS 541620
Ranked by positive obligations in the latest 12 months. Share is of all positive obligations in this market.
| # | Contractor | Latest 12 mo | Prior 12 mo | Share | Rank change |
|---|---|---|---|---|---|
| 1 | Tetra Tech, Inc. | $50.9M | $62.7M | 17.3% | ▲ 1 |
| 2 | General Dynamics Information Technology, Inc. | $46.9M | $13.9M | 15.9% | ▲ 3 |
| 3 | Eastern Research Group Inc | $40.1M | $55.9M | 13.6% | — |
| 4 | S C & a Inc | $24.2M | $31.1M | 8.2% | — |
| 5 | The Cadmus Group LLC | $18.3M | $10.2M | 6.2% | ▲ 3 |
| 6 | Toeroek Associates, Inc. | $15.5M | $1.2M | 5.3% | ▲ 21 |
| 7 | Environmental Management Support, Inc | $14.4M | $4.5M | 4.9% | ▲ 8 |
| 8 | Weston-Techlaw JV LLC | $9.4M | $10.8M | 3.2% | ▼ 1 |
| 9 | Great Lakes Environmental Center, Inc | $9.2M | $4.7M | 3.1% | ▲ 4 |
| 10 | PB&A/CSS JV, LLC. | $8.6M | −$48K | 2.9% | New |
| 11 | SRC Inc | $7.7M | $3.5M | 2.6% | ▲ 5 |
| 12 | WSP USA Environment & Infrastructure Inc. | $5.9M | $12.9M | 2.0% | ▼ 6 |
| 13 | Aleut Technical Services, LLC | $5.5M | $2.6M | 1.9% | ▲ 5 |
| 14 | Weston Solutions Inc | $5.3M | $84.8M | 1.8% | ▼ 13 |
| 15 | Bluestone - Burns & Mcdonnell JV | $4.0M | $0 | 1.4% | New |
What changed in the last 12 months
Contractors with the largest change in reported obligations versus the preceding 12 months.
Largest gains
- General Dynamics Information Technology, Inc.$13.9M → $46.9M (+$33.0M) · now #2
- Toeroek Associates, Inc.$1.2M → $15.5M (+$14.3M) · now #6
- Environmental Management Support, Inc$4.5M → $14.4M (+$9.9M) · now #7
Largest declines
- Weston Solutions Inc$84.8M → $5.3M (−$79.6M) · now #14
- Eastern Research Group Inc$55.9M → $40.1M (−$15.8M) · now #3
- Tetra Tech, Inc.$62.7M → $50.9M (−$11.8M) · now #1
New to this market
7 contractors received their first obligations in this market (since FY2022) during the latest 12 months. The largest:
| Contractor | First obligation | Latest 12 mo |
|---|---|---|
| Alta Science & Engineering Inc | Jul 15, 2026 | $1.2M |
| DDC 4c, LLC | Oct 17, 2025 | $739K |
| The NDN Companies | Apr 1, 2026 | $664K |
| Wilbur Technical Services LLC | Sep 16, 2026 | $512K |
| Goodwill Vision Enterprises, Inc. | Jun 1, 2026 | $475K |
| Environmental Testing and Consulting, Inc. | Sep 25, 2026 | $72K |
| Palmerton Municipal Authority | Sep 17, 2026 | $45K |
Where the money comes from
Funding sub-agencies within the Environmental Protection Agency, latest 12 months. The funding organization can differ from the office that runs the requirement.
| Funding sub-agency | Latest 12 mo | Prior 12 mo | Change |
|---|---|---|---|
| Environmental Protection Agency | $287.8M | $351.4M | Down $63.5M (18.1%) |
Potential recompetes
Large awards in this market whose current period of performance ends in the next 18 months. Treat these as research leads: options, extensions, and follow-on vehicles often change the timing.
| Award | Incumbent | Obligated | Current end |
|---|---|---|---|
| 68HE0925F0018 | Weston Solutions Inc 2025 CALIFORNIA WILDFIRES AND STRAIGHT-LINE WINDS EVENT. TO 110 TO SUPPORT THE 2025 SOCAL WILDFIRES. | $13.9M | Dec 31, 2026 |
| 68HERC24F0156 | Eastern Research Group Inc CLOSING AMERICAS WASTEWATER ACCESS GAP COMMUNITY PROGRAM SUPPORT | $31.6M | Feb 15, 2027 |
| 68HE0322F0065 | Weston-Techlaw JV LLC THIS ACTION FUNDS A NEW TASK ORDER ON THE REAC CONTRACT, 68HE0321D001, FOR THE CORE RESPONSE TEAM (CRT). THERE IS NO SITE SPECIFIC ID OR SITE NAME. TOCOR/PO: SELLA BURCHETTE… | $23.0M | Jul 10, 2027 |
| 68HERC24F0452 | Eastern Research Group Inc DRINKING WATER AND WASTEWATER TECHNICAL ASSISTANCE TO TRIBES AND ALASKAN NATIVE VILLAGES REGION 6 - GEOGRAPHIC AREA E SUPPORT LSLR AND EC ACTIVITIES FOR TRIBES IN REGION 6 | $12.7M | Aug 14, 2027 |
| 68HERC24F0211 | Eastern Research Group Inc SUPPORT FOR 2023 WATERTA ENGINEERING SUPPORT SERVICES FOR OWM | $24.2M | Aug 27, 2027 |
| 68HERW26F0203 | The Cadmus Group LLC R425 - WATER ENGINEERING SUPPORT SERVICES FOR OFFICE OF GROUND WATER AND DRINKING WATER (OGWDW). | $12.9M | Sep 17, 2027 |
| 68HERC24F0515 | S C & a Inc "TACKLING EMERGING CONTAMINANTS (TEC) WATER TECHNICAL ASSISTANCE (WATERTA)" | $52.8M | Sep 18, 2027 |
| 68HERC26F0013 | General Dynamics Information Technology, Inc. R499 SUPPORT FOR LEAD SERVICE LINE INVENTORIES AND REPLACEMENT - GET THE LEAD OUT (GLO) INITIATIVE | $34.1M | Nov 4, 2027 |
| 68HE0923F0051 | Tetra Tech, Inc. THE CONTRACTOR SHALL PERFORM REQUIRED TO CONDUCT THE ENGINEERING EVALUATION/COST ANALYSIS (EE/CA) AND RELATED TASKS AT THE FOLLOWING TRONOX ABANDONED URANIUM MINES LOCATED IN… | $20.3M | Nov 30, 2027 |
| 68HE0923F0071 | Tetra Tech, Inc. THE CONTRACTOR PROVIDE TECHNICAL SUPPORT AND ASSISTANCE FOR THE USEPA NAVAJO ABANDONED URANIUM MINES (NAUM) PROGRAM AS IT DEVELOPS PROGRAM STANDARDS, TRAININGS AND WORKSHOPS, AND… | $13.5M | Mar 1, 2028 |
Common questions
Who are the top EPA contractors for NAICS 541620?
In the latest 12 months, Tetra Tech, Inc. ($50.9M), General Dynamics Information Technology, Inc. ($46.9M), Eastern Research Group Inc ($40.1M) received the most EPA obligations for environmental consulting services.
How concentrated is this market?
The eight largest primes held 74.7% of positive obligations, and Tetra Tech, Inc. alone held 17.3%. 7 contractors won their first obligations in this market during the latest 12 months.
Are any large EPA NAICS 541620 contracts ending soon?
10 of the largest awards in this market reach their current end date in the next 18 months. The first is 68HE0925F0018 (Weston Solutions Inc, $13.9M obligated), ending Dec 31, 2026. An end date is a research lead, not a confirmed recompete: options and extensions often move it.
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$19.1MFigures are net obligations on prime contracts (award types A–D) from USAspending.gov, grouped by funding agency and the NAICS code on each award. Net obligations include deobligations and corrections, so they can differ from positive-obligation totals. See methodology.
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