Top Interior environmental consulting services contractors
In the 12 months ending Oct 5, 2026, the Department of the Interior obligated $77.7M in net prime contract dollars under NAICS 541620, down 4.7% from $81.5M in the preceding 12 months. 226 prime contractors received positive obligations, and 46 of them accounted for 80% of that spend.
Prime contracts funded by the Department of the Interior. 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 Interior 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 | Environmental Management & Planning Solutions LLC | $7.5M | $2.2M | 9.1% | ▲ 10 |
| 2 | DR Reed & Associates, Inc | $6.6M | $6.9M | 8.0% | ▼ 1 |
| 3 | Vanasse Hangen Brustlin Inc | $6.0M | $1.2M | 7.3% | ▲ 19 |
| 4 | WSP USA Solutions Inc | $4.6M | −$138K | 5.6% | New |
| 5 | Air Resource Specialists, Inc | $2.2M | $2.4M | 2.7% | ▲ 4 |
| 6 | Sundance Consultants, LLC | $2.2M | $1.5M | 2.6% | ▲ 9 |
| 7 | Tetra Tech, Inc. | $1.9M | $208K | 2.3% | ▲ 67 |
| 8 | New South Associates, Inc. | $1.9M | $329K | 2.3% | ▲ 40 |
| 9 | Blue World Research Institute Inc | $1.8M | $1.1M | 2.2% | ▲ 14 |
| 10 | Eastern Research Group Inc | $1.7M | $3.4M | 2.1% | ▼ 3 |
| 11 | Swca, Incorporated | $1.6M | $1.3M | 2.0% | ▲ 5 |
| 12 | Oneida-Stantec JV LLC | $1.5M | $0 | 1.9% | New |
| 13 | Asir LLC | $1.5M | $1.2M | 1.8% | ▲ 6 |
| 14 | Sequoia Ecological Consulting, Inc. | $1.4M | −$805K | 1.7% | New |
| 15 | BIO-West Inc | $1.3M | $449K | 1.6% | ▲ 25 |
What changed in the last 12 months
Contractors with the largest change in reported obligations versus the preceding 12 months.
Largest gains
- Environmental Management & Planning Solutions LLC$2.2M → $7.5M (+$5.3M) · now #1
- Vanasse Hangen Brustlin Inc$1.2M → $6.0M (+$4.8M) · now #3
- WSP USA Solutions Inc−$138K → $4.6M (+$4.7M) · now #4
Largest declines
- Copperhead Environmental Consulting Inc$6.2M → $92K (−$6.2M) · now #112
- Stantec Consulting Services Inc.$5.7M → $789K (−$4.9M) · now #25
- S C & a Inc$3.8M → $0 (−$3.8M) · no latest-period obligations
New to this market
67 contractors received their first obligations in this market (since FY2022) during the latest 12 months. The largest:
| Contractor | First obligation | Latest 12 mo |
|---|---|---|
| Oneida-Stantec JV LLC | May 7, 2026 | $1.5M |
| Fishbio | Apr 30, 2026 | $1.3M |
| Shundiin Shine Lighting and Electrical Supplies, LLC | Aug 11, 2026 | $811K |
| Brownfields Development LLC | Aug 24, 2026 | $559K |
| Table Rock Forestry, Inc | Jan 16, 2026 | $473K |
| River Partners | Sep 11, 2026 | $470K |
| Natures Capital LLC | Apr 1, 2026 | $415K |
| Renova Environmental Company | Apr 21, 2026 | $349K |
Where the money comes from
Funding sub-agencies within the Department of the Interior, 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 |
|---|---|---|---|
| Bureau of Reclamation | $27.0M | $24.3M | Up $2.6M (10.9%) |
| National Park Service | $20.3M | $14.7M | Up $5.6M (37.9%) |
| Bureau of Land Management | $16.1M | $34.6M | Down $18.5M (53.6%) |
| U.S. Fish and Wildlife Service | $6.6M | $3.2M | Up $3.4M (105.4%) |
| Bureau of Ocean Energy Management | $5.1M | $1.5M | Up $3.6M (246.7%) |
| Bureau of Indian Affairs and Bureau of Indian Education | $2.0M | $2.7M | Down $664K (24.6%) |
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 |
|---|---|---|---|
| 140L0621F0294 | Critigen LLC BLANKET PURCHASE AGREEMENT (BPA) FOR BUREAU OF LAND MANAGEMENT (BLM) GEOSPATIAL TECHNOLOGY AND DATA SUPPORT SERVICES, WILDLIFE LAB (4 GEOSPATIAL DATA ANALYSTS AND 1 DATA… | $2.8M | Oct 21, 2026 |
| 140L0623F0291 | Versar, Inc. BPA#13 COOPERATIVE ROCK ART RECORDING | $3.9M | Nov 30, 2026 |
| 140R2025P0072 | DR Reed & Associates, Inc CONTINUOUS FLOW AND WATER QUALITY MONITORING NETWORK IN THE SACRAMENTO-SAN JOAQUIN DELTA AND SUISUN BAY | $13.5M | Apr 30, 2027 |
| 140P2123F0085 | Vanasse Hangen Brustlin Inc RI/FS* UNDER CERCLA AT KENNECOTT MINES AND MILL TOWN SITE IN WRANGELL - ST. ELIAS NATIONAL PARK AND PRESERVE, ALASKA. INCLUDES OPTIONS FOR MULTIPLE PHASES OF RI. *RI/FS REMEDIAL… | $2.6M | May 30, 2027 |
| 140L1225F0057 | North Wind Resource Consulting LLC FACILITATION AND ASSISTANCE FOR PREPARATION OF TWO (2) ENVIRONMENTAL IMPACT STATEMENTS - TRANSMISSION LINE RATING REMEDIATION (TLRR) PROJECTS | $2.8M | Jul 30, 2027 |
| 140R2025P0067 | Sequoia Ecological Consulting, Inc. BATTLE CREEK SALMON AND STEELHEAD RESTORATION PROJECT-PHASE 2 ENVIRONMENTAL COMPLIANCE AND SUPPORT SERVICES | $3.2M | Oct 1, 2027 |
| 140L5724F0041 | Eastern Research Group Inc UTAH AIM/HAF-FLMPA INVENTORY/ASSESSMENT | $5.2M | Nov 30, 2027 |
| 140R3023F0110 | Environmental Management & Planning Solutions LLC FEASIBILITY REPORT AND EIS - VRSMP | $4.7M | Dec 30, 2027 |
| 140R2024P0011 | MBK Engineers ENVIRONMENTAL CONSULTING SERVICE FOR THE ANALYSIS OF THE NORTH TO SOUTH WATER TRANSFER TO SUPPORT DRY AND DROUGHT CONDITION ACTIVITIES THROUGHOUT THE STATE OF CALIFORNIA | $4.9M | Feb 29, 2028 |
| 140P1323F0052 | Earth Systems LLC PAIS-LEMON PAD OIL & GAS RESORATION | $3.5M | Mar 31, 2028 |
Common questions
Who are the top Interior contractors for NAICS 541620?
In the latest 12 months, Environmental Management & Planning Solutions LLC ($7.5M), DR Reed & Associates, Inc ($6.6M), Vanasse Hangen Brustlin Inc ($6.0M) received the most Interior obligations for environmental consulting services.
How concentrated is this market?
The eight largest primes held 39.9% of positive obligations, and Environmental Management & Planning Solutions LLC alone held 9.1%. 67 contractors won their first obligations in this market during the latest 12 months.
Are any large Interior 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 140L0621F0294 (Critigen LLC, $2.8M obligated), ending Oct 21, 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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