Top DOT environmental consulting services contractors
In the 12 months ending Oct 5, 2026, the Department of Transportation obligated $15.2M in net prime contract dollars under NAICS 541620, down 56.6% from $35.1M in the preceding 12 months. 28 prime contractors received positive obligations, and 6 of them accounted for 80% of that spend.
Prime contracts funded by the Department of Transportation. 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 DOT 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 | TRC Environmental Corporation | $4.9M | $2.2M | 31.2% | ▲ 3 |
| 2 | WSP USA Solutions Inc | $2.5M | $1.9M | 16.0% | ▲ 3 |
| 3 | Pacific Western Technologies, Ltd. | $1.6M | $728K | 10.3% | ▲ 6 |
| 4 | ICF Incorporated, L.L.C. | $1.4M | $1.3M | 8.7% | ▲ 3 |
| 5 | GSI Hawaii Inc. | $1.3M | $300K | 8.4% | ▲ 8 |
| 6 | Sustainable Design Consortium, (SDC) Inc | $1.0M | $570K | 6.5% | ▲ 4 |
| 7 | Weston Solutions Inc | $534K | $4.9M | 3.4% | ▼ 4 |
| 8 | Stantec Consulting Services Inc. | $517K | $434K | 3.3% | ▲ 3 |
| 9 | CDM Federal Programs Corporation | $408K | $405K | 2.6% | ▲ 3 |
| 10 | Langan Engineering & Environmental Services, LLC | $257K | $0 | 1.6% | New |
| 11 | Bridgenet International Inc. | $185K | $0 | 1.2% | New |
| 12 | COW Creek Band of Umpqua Tribe of Indians | $150K | $0 | 1.0% | New |
| 13 | Quinn Evans Architects Inc | $145K | $0 | 0.9% | New |
| 14 | Universiteit Hasselt | $115K | $0 | 0.7% | New |
| 15 | Acoustical Analysis Associates, Inc. | $90K | $90K | 0.6% | ▲ 8 |
What changed in the last 12 months
Contractors with the largest change in reported obligations versus the preceding 12 months.
Largest gains
- TRC Environmental Corporation$2.2M → $4.9M (+$2.7M) · now #1
- GSI Hawaii Inc.$300K → $1.3M (+$1.0M) · now #5
- Pacific Western Technologies, Ltd.$728K → $1.6M (+$882K) · now #3
Largest declines
- Absg Consulting Inc$11.6M → $0 (−$11.6M) · no latest-period obligations
- Pinyon-Sundance JV, LLC$6.8M → $0 (−$6.8M) · no latest-period obligations
- Weston Solutions Inc$4.9M → $534K (−$4.4M) · now #7
New to this market
9 contractors received their first obligations in this market (since FY2022) during the latest 12 months. The largest:
| Contractor | First obligation | Latest 12 mo |
|---|---|---|
| Langan Engineering & Environmental Services, LLC | Nov 19, 2025 | $257K |
| Bridgenet International Inc. | Apr 13, 2026 | $185K |
| COW Creek Band of Umpqua Tribe of Indians | Jun 26, 2026 | $150K |
| Quinn Evans Architects Inc | Aug 28, 2026 | $145K |
| Universiteit Hasselt | May 18, 2026 | $115K |
| Washington State University | Aug 20, 2026 | $79K |
| Sage, LLC | May 13, 2026 | $71K |
| AECOM Technical Services, Inc. | Apr 1, 2026 | $35K |
Where the money comes from
Funding sub-agencies within the Department of Transportation, 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 |
|---|---|---|---|
| Federal Aviation Administration | $7.1M | $8.9M | Down $1.8M (20.3%) |
| Federal Highway Administration | $5.4M | $24.0M | Down $18.6M (77.4%) |
| Pipeline and Hazardous Materials Safety Administration | $1.3M | $300K | Up $1.0M (339.8%) |
| Maritime Administration | $1.1M | $695K | Up $384K (55.2%) |
| Immediate Office of the Secretary of Transportation | $429K | $229K | Up $200K (87.1%) |
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 |
|---|---|---|---|
| 693KA920C00018 | ICF Incorporated, L.L.C. ENVIRONMENTAL SUPPORT SERVICES | $5.8M | Dec 29, 2026 |
| 6973GH24F00667 | Weston Solutions Inc 6973GH-21-D-00033 PFAS FOCUSED SITE INVESTIGATION | $1.8M | Dec 31, 2026 |
| 693JF722F00082N | Sustainable Design Consortium, (SDC) Inc THE PURPOSE OF THIS TASK ORDER IS TO TASK THE CONTRACTOR TO PROVIDE 2545.45454 HOURS OF DECOMMISSIONING FIELD INSPECTION SERVICES AND 1585.53987 HOURS OF INDEPENDENT… | $4.8M | Dec 31, 2026 |
| 693JJ323F00420N | WSP USA Solutions Inc TO AWARD A BPA CALL FOR "NEXTGEN NATIONAL HOUSEHOLD TRAVEL SURVEY (NHTS) - DEVELOPING AND DELIVERING POST-PANDEMIC NATIONAL TRAVELER BEHAVIOR CORE DATA". | $8.8M | Jan 27, 2027 |
| 693C7322F000038 | Pacific Western Technologies, Ltd. ROAD INVENTORY PROGRAM DATA COLLECTION, DATABASE ADMINISTRATION/QUALITY CONTROL, GIS SUPPORT, AND REPORT QUALITY CONTROL. | $5.2M | Mar 1, 2027 |
| 69319524F10042N | Dewberry Engineers Inc. THE PURPOSE OF THIS CALL ORDER IS TO PROCURE ENVIRONMENTAL SERVICES SUPPORT. | $2.0M | Mar 25, 2027 |
| 6973GH25F01062 | Weston Solutions Inc COP SUPPLEMENTAL REMEDIAL INVESTIGATION PHASE 3 | $2.6M | Jun 30, 2027 |
| 693JJ324F00312N | WSP USA Solutions Inc THE PURPOSE OF THIS PR IS FOR A NEW TASK ORDER ENTITLED: "APPLICATIONS OF ENTERPRISE GIS FOR TRANSPORTATION PFS (AEGIST) PART 2" TO BE AWARDED UNDER HPL'S BPA TECHNICAL SUPPORT… | $1.4M | Sep 4, 2027 |
| 692M1526F00311 | TRC Environmental Corporation TRC TO 144 AREA Z PFAS REMEDIAL INVESTIGATION PHASE 1B | $2.1M | Mar 9, 2028 |
| 693JJ325F00267N | WSP USA Solutions Inc THIS IS A FIRM FIXED PRICE CALL ORDER FOR THE PROJECT ENTITLED, "DEVELOPMENT AND FACILITATION OF RESOURCES, PEER-TO-PEER EXCHANGES, AND EDUCATIONAL OUTREACH FOR FHWAS… | $2.2M | Mar 30, 2028 |
Common questions
Who are the top DOT contractors for NAICS 541620?
In the latest 12 months, TRC Environmental Corporation ($4.9M), WSP USA Solutions Inc ($2.5M), Pacific Western Technologies, Ltd. ($1.6M) received the most DOT obligations for environmental consulting services.
How concentrated is this market?
The eight largest primes held 87.8% of positive obligations, and TRC Environmental Corporation alone held 31.2%. 9 contractors won their first obligations in this market during the latest 12 months.
Are any large DOT 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 693KA920C00018 (ICF Incorporated, L.L.C., $5.8M obligated), ending Dec 29, 2026. An end date is a research lead, not a confirmed recompete: options and extensions often move it.
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$24.7MFigures 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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