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NAICS 541620 market
NAICS 541620

NAICS 541620 contractors: Environmental Consulting Services

95 federal prime contractors list NAICS 541620 as their primary industry. Together they received $806.8M in prime contract obligations in the latest 12 months. The largest by obligations since FY2022 is Eastern Research Group Inc, and most are headquartered in Virginia, Maryland, and Arizona.

All 95 contractors

Ranked by prime contract obligations since FY2022, across all their NAICS codes. Open a profile for top agencies, recent awards, and contracts ending soon.

NAICS 541620 contractors: Environmental Consulting Services
ContractorHeadquartersLatest 12 moSince FY2022
Eastern Research Group IncMassachusetts$104.6M$576.7M
The Cadmus Group LLCVirginia$29.4M$322.0M
Project Enhancement CorporationMaryland$46.8M$240.8M
S C & a IncVirginia$34.1M$143.2M
Tetra Tech, Inc.Illinois$18.7M$140.4M
Consolidated Safety Services IncorporatedVirginia$20.9M$118.1M
Vernadero Group IncArizona$64.8M$106.7M
Environmental Incentives, Inc.California$0$93.9M
Tetra Tech, Inc.California$16.7M$89.1M
Gulf South Research CorpLouisiana$48.4M$77.4M
Boston Government Services, LLCTennessee$0$74.6M
Gryphon Environmental, LLCColorado$14.4M$66.8M
SOL Solutions, LLCArizona$1.1M$63.0M
Environmental Compliance Consultants, Inc.Alaska$7.2M$59.6M
Marstel-Day, LLCVirginia$5.5M$56.8M
Environmental Management & Planning Solutions LLCColorado$7.5M$56.6M
Weston-Techlaw JV LLCVirginia$9.4M$55.6M
Mabbett & Associates, Inc.Massachusetts$12.6M$55.5M
The Solution Foundry, LLCGeorgia$8.6M$54.0M
Environmental Assessment Services, LLCWashington$3.1M$52.1M
Bluestone Environmental Group, Inc.Pennsylvania$8.0M$51.5M
Integrated Systems Solutions, Inc.Virginia$10.1M$51.2M
Skeo Solutions, IncVirginia$1.5M$50.8M
Tetra Tech, Inc.Georgia$8.6M$47.8M
Environmental Research Group, L.L.C.Maryland$3.4M$46.6M
Great Lakes Environmental Center, IncMichigan$9.9M$44.9M
Haztrain IncMaryland$8.9M$44.9M
Toeroek Associates, Inc.Colorado$18.0M$44.8M
ECO & Associates, Inc.California$26.0M$42.4M
Tetra Tech, Inc.Missouri$3.0M$41.4M
Solv LLCVirginia$2.4M$41.0M
Sundance Consultants, LLCIdaho$12.8M$39.8M
Independent Strategic Management Solutions IncWashington$15.7M$38.6M
HSG, LLCNevada$5.3M$36.7M
Tetra Tech IncColorado$5.8M$31.2M
North Wind Resource Consulting LLCIdaho$2.8M$31.1M
RPI-CSS, LLCSouth Carolina$14.9M$30.0M
Environmental Management Support, IncMaryland$14.4M$29.5M
Genwest Systems IncWashington$5.4M$29.0M
Aleut Technical Services, LLCLouisiana$6.7M$27.1M
Whitetail Environmental, LLCOklahoma$976K$26.0M
DR Reed & Associates, IncColorado$8.5M$25.8M
Association of Consultants and EngineersMaryland$2.9M$24.3M
Paleowest LLCArizona$798K$24.3M
Straughan Environmental, Inc.Maryland$3.5M$23.9M
Tierra Right of Way Services LtdArizona$21.6M$23.8M
Research Planning, Inc.South Carolina$9.6M$23.5M
Ardl IncIllinois$6.5M$23.3M
Jacobs Geosyntec a Joint VentureFlorida$7.7M$23.3M
PB&A/CSS JV, LLC.Texas$8.6M$23.0M
Applied Environmental, Inc.Virginia$1.1M$22.4M
Neptune and Company, IncorporatedColorado$4.9M$22.0M
The NDN CompaniesFlorida$9.1M$22.0M
Umyuaq Consulting Group, LLCAlaska$395K$21.1M
Environmental Science CorporationOutside the U.S.$1.5M$21.0M
Tetra Tech, Inc.Virginia$1.5M$20.8M
Swca, IncorporatedArizona$1.6M$20.2M
Sundance EA Associates IIIdaho$1.7M$19.4M
Auxilio Management ServicesColorado$2.0M$18.8M
Q & a Diversified LLCTexas$3.8M$18.7M
Hikina 2 Komohana Consulting Inc.New Jersey$170K$17.8M
Specpro Professional Services, LLCTexas$151K$17.5M
Renova-Sovereign Joint VentureNew Jersey−$73K$17.1M
Avanti CorporationVirginia$1.5M$16.8M
First Environment IncNew Jersey$1.5M$16.8M
Rmec Environmental, LLCUtah$3.6M$16.8M
S.S. Papadopulos & Associates, Inc.Maryland$3.6M$16.4M
Horsley Witten Group, Inc.Massachusetts$1.4M$16.2M
DGI-ATI II LLCMaryland$8.5M$16.1M
Air Resource Specialists, IncColorado$2.5M$15.8M
Southeastern Archaeological Research, LLCFlorida$127K$15.2M
TRC Environmental CorporationConnecticut$5.1M$15.1M
Logan Simpson Design Inc.Arizona$520K$14.9M
Potomac-Hudson Engineering IncMaryland−$2.2M$14.6M
pi2e JV LLPOhio$0$14.2M
Tellus Civic Science CorporationCalifornia$1.9M$14.1M
Copperhead Environmental Consulting IncKentucky$2.8M$13.7M
Clark Group, LLC, theVermont$1.9M$13.6M
SRS Battelle JV, LLCWisconsin$0$13.4M
DDC 4c, LLCArizona$7.5M$13.2M
BTP Services, LLCTennessee−$31K$12.9M
Propel Solutions LLCVirginia$7.1M$12.8M
Weston Solutions IncTexas$0$12.8M
Bluestone - Burns & Mcdonnell JVPennsylvania$7.2M$12.5M
Blue World Research Institute IncFlorida$1.8M$12.4M
DDC Construction Services LLCArizona$803K$11.7M
Environmental Synectics, IncCalifornia$1.5M$11.4M
PG Environmental, LLCVirginia$0$11.2M
Tahkox e2-Whitetail LLCOklahoma$2.6M$11.0M
Hamer Environmental Limited PartnershipWashington$3.3M$10.8M
SES Inc.Kansas$3.9M$10.8M
Harris Environmental Group IncArizona$1.2M$10.7M
pi3e JV LLPOhio$201K$10.6M
ATI-Endyna JV, LLCVirginia$0$10.6M
NDN Otie JV, LLCFlorida$1.0M$10.5M

Prime contract obligations from USAspending.gov through Oct 5, 2026. A contractor's primary NAICS is the code with the most obligations since FY2022. For the largest contractors in this NAICS by obligations under it, see the NAICS 541620 market page. To search by name, UEI, or CAGE code, use the contractor directory.

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