NAICS 541620
Environmental Consulting Services
Federal contractor footprint · 71 profiled contractors
Combined Contractor Footprint
$3.5B
Obligations under NAICS 541620 across the 71 GovExpress-profiled contractors that report the code. Not total federal spending in the code, and not de-duplicated across corporate families that file under more than one parent record.
Top Federal Contractors — Environmental Consulting Services
Obligations under NAICS 541620 across the 71 GovExpress-profiled contractors that report the code. Not total federal spending in the code, and not de-duplicated across corporate families that file under more than one parent record.
- TETRA TECH, INC.$1.1B
- BOOZ ALLEN HAMILTON HOLDING CORPORATION$524.5M
- SRC INC$278.0M
- HSG, LLC$245.5M
- RESEARCH TRIANGLE INSTITUTE$174.7M
- LYNKER CORPORATION$170.9M
- CHEROKEE NATION$159.0M
- SOUTHWEST RESEARCH INSTITUTE$98.7M
- RSI ENTECH, LLC$88.8M
- FEDITC, LLC$84.0M
Agencies Buying This Code
Estimated by weighting each profiled contractor's agency mix by its NAICS 541620 footprint. Directional, not an agency-by-code total.
- Department of Defense (Department of War)$1.2B
- Agency for International Development$403.9M
- National Aeronautics and Space Administration$295.9M
- Department of Commerce$252.2M
- Department of Health and Human Services$204.6M
- Department of Energy$192.0M
- General Services Administration$166.3M
- Department of Transportation$150.8M
Competing in NAICS 541620?
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Obligations under NAICS 541620 across the 71 GovExpress-profiled contractors that report the code. Not total federal spending in the code, and not de-duplicated across corporate families that file under more than one parent record. Spending data from FPDS-NG via USASpending.gov, read between 2026-09-22 and 2026-10-27. Standard 90-day reporting lag per FAR 4.606(c). Read the full methodology.