NAICS Code 541620: Environmental Consulting Services
National industry
SBA small business size standard: $19 million in average annual receipts
Definition
This industry comprises establishments primarily engaged in providing advice and assistance to businesses and other organizations on environmental issues, such as the control of environmental contamination from pollutants, toxic substances, and hazardous materials. These establishments identify problems (e.g., inspect buildings for hazardous materials), measure and evaluate risks, and recommend solutions.
They employ a multidisciplined staff of scientists, engineers, and other technicians with expertise in areas, such as air and water quality, asbestos contamination, remediation, ecological restoration, and environmental law. Establishments providing sanitation or site remediation consulting services are included in this industry.
Code facts
- Part of
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-
54
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541
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5416
- 54162
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5416
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541
-
54
- Contract awards
- 1,378 In the last 12 months
- Contract obligations
- $1,138,792,484 In FY2025
NAICS codes and definitions come from the U.S. Census Bureau, size standards from the SBA and contract spending from SAM.gov/FPDS.
Business activities under NAICS 541620
- Environmental consulting services
- Sanitation consulting services
- Site remediation consulting services
Looking for another activity? Search the NAICS code lookup or browse business activities from A to Z.
Contract obligations by fiscal year
| Fiscal year | Obligated |
|---|---|
| FY2027 To date | $17,419,273 |
| FY2026 | $999,490,983 |
| FY2025 | $1,138,792,484 |
| FY2024 | $1,450,763,858 |
| FY2023 | $1,402,766,341 |
Top contractors by obligations
| Rank | Contractor | Obligated, FY2026–FY2027 | Share |
|---|---|---|---|
| 1 | Vernadero Group Inc. | $64,182,896 | |
| 2 | Eastern Research Group Inc. | $50,036,360 | |
| 3 | General Dynamics Information Technology, Inc. | $45,735,677 | |
| 4 | Gulf South Research Corp | $40,156,170 | |
| 5 | Project Enhancement Corporation | $34,997,530 | |
| 6 | S C & A Inc. | $28,028,422 | |
| 7 | ECO & Associates, Inc. | $25,936,761 | |
| 8 | The Cadmus Group LLC | $23,214,257 | |
| 9 | Tetra Tech, Inc. | $23,114,745 | |
| 10 | Tierra Right Of Way Services LTD | $21,497,236 |
See the full FY2025 ranking of NAICS 541620 contractors, by parent company.
Top funding agencies by obligations
| Rank | Agency | Obligated, FY2026–FY2027 | Share |
|---|---|---|---|
| 1 | Environmental Protection Agency | $273,746,840 | |
| 2 | Department of Homeland Security | $200,655,712 | |
| 3 | Department of the Army | $126,203,445 | |
| 4 | Department of the Interior | $76,718,385 | |
| 5 | Department of Commerce | $73,642,871 | |
| 6 | Department of Energy | $65,454,593 | |
| 7 | National Aeronautics and Space Administration | $37,985,194 | |
| 8 | Department of the Navy | $24,753,198 | |
| 9 | Air Force | $24,534,178 | |
| 10 | Department of Agriculture | $20,730,401 |
Top PSC codes by obligations
| Rank | PSC code | Obligated, FY2026–FY2027 | Share |
|---|---|---|---|
| 1 | F999 Other Environmental Services, Studies, and Analytical Support | $243,705,944 | |
| 2 | R499 Other Professional Services | $172,959,510 | |
| 3 | B510 Environmental Studies and Assessments | $132,811,425 | |
| 4 | F115 Environmental Systems Protection – Environmental Consulting and Legal Support | $55,692,922 | |
| 5 | R699 Other Administrative Support Services | $47,277,409 | |
| 6 | F110 Development of Environmental Impact Statements and Assessments | $43,626,363 | |
| 7 | R425 Engineering and Technical Services | $37,772,424 | |
| 8 |
R408 Program Management/ |
$34,313,554 | |
| 9 | F108 Hazardous Substance Removal, Cleanup, and Disposal Services and Operational Support | $31,303,665 | |
| 10 | C219 Other Architect and Engineering Services | $25,533,455 |
Contract obligations by state
| Rank | Place of performance | Obligated, last 12 months | Share |
|---|---|---|---|
| 1 | Virginia | $116,226,004 | |
| 2 | Texas | $108,256,286 | |
| 3 | Maryland | $92,854,968 | |
| 4 | District of Columbia | $89,020,586 | |
| 5 | Arizona | $73,542,938 | |
| 6 | Massachusetts | $65,071,442 | |
| 7 | California | $39,248,352 | |
| 8 | Colorado | $32,612,708 | |
| 9 | Washington | $31,402,641 | |
| 10 | Pennsylvania | $27,496,036 | |
| 11 | Georgia | $26,807,814 | |
| 12 | Florida | $23,573,522 | |
| 13 | New Jersey | $20,009,027 | |
| 14 | Louisiana | $18,933,589 | |
| 15 | New Mexico | $17,819,694 | |
| 16 | Ohio | $16,185,814 | |
| 17 | Hawaii | $13,507,309 | |
| 18 | Illinois | $12,705,848 | |
| 19 | New York | $12,588,159 | |
| 20 | Wisconsin | $11,592,732 | |
| 21 | Mississippi | $11,049,066 | |
| 22 | Tennessee | $10,614,350 | |
| 23 | Michigan | $10,519,220 | |
| 24 | Alaska | $10,180,060 | |
| 25 | Oklahoma | $9,473,559 | |
| 26 | Utah | $9,129,750 | |
| 27 | Kansas | $8,958,620 | |
| 28 | South Carolina | $8,778,253 | |
| 29 | Alabama | $7,426,559 | |
| 30 | Oregon | $7,408,351 | |
| 31 | Arkansas | $6,677,857 | |
| 32 | Guam | $5,575,498 | |
| 33 | Missouri | $4,431,206 | |
| 34 | Puerto Rico | $4,003,637 | |
| 35 | Montana | $3,313,586 | |
| 36 | Idaho | $3,277,179 | |
| 37 | North Carolina | $2,991,969 | |
| 38 | Iowa | $2,822,041 | |
| 39 | Nevada | $2,716,698 | |
| 40 | Kentucky | $2,227,191 | |
| 41 | Minnesota | $2,180,690 | |
| 42 | Vermont | $1,739,470 | |
| 43 | North Dakota | $1,569,029 | |
| 44 | Wyoming | $1,045,626 | |
| 45 | Nebraska | $979,157 | |
| 46 | Indiana | $931,370 | |
| 47 | American Samoa | $928,000 | |
| 48 | South Dakota | $637,173 | |
| 49 | Maine | $577,796 | |
| 50 | New Hampshire | $414,968 | |
| 51 | Rhode Island | $253,372 | |
| 52 | Delaware | $200,829 | |
| 53 | West Virginia | $94,031 | |
| 54 | Northern Mariana Islands | $67,736 |
Show all 54
Shares are of everything obligated under NAICS 541620 in the last 12 months before deobligations, including work performed abroad or with no place of performance on record.
Contract opportunities
Show 37 more
Latest 47 of 11,857 listed here. See the rest on GovTribe.
Size standard history
Federal Register rules that named this code
From the NAICS codes each rule's amendments to 13 CFR 121.201 name. Rules that print their size standard tables as images aren't listed.
Quick answers
What is NAICS 541620?
NAICS 541620 is Environmental Consulting Services, a national industry in NAICS 54, Professional, Scientific, and Technical Services.
What is the NAICS code for sanitation consulting services?
The NAICS code for sanitation consulting services is 541620, Environmental Consulting Services.
What is the NAICS code for environmental consulting services?
The NAICS code for environmental consulting services is 541620, Environmental Consulting Services.
What is the NAICS code for site remediation consulting services?
The NAICS code for site remediation consulting services is 541620, Environmental Consulting Services.
When did the size standard for NAICS 541620 last change?
The most recent Federal Register rule on record that names NAICS 541620 in the SBA's size standards is "Small Business Size Standards: Adjustment of Monetary-Based Size Standards, Disadvantage Thresholds, and 8(a) Eligibility Thresholds for Inflation" (87 FR 69118), published Nov 17, 2022 and effective Dec 19, 2022.
How much do federal agencies spend under NAICS 541620?
Federal contracts under NAICS 541620 obligated $1,138,792,484 in fiscal year 2025 and $5,009,232,940 in fiscal years 2023 through 2027.
Who are the largest contractors under NAICS 541620?
The contractors with the most obligated under NAICS 541620 in fiscal years 2026 and 2027 are Vernadero Group Inc. ($64,182,896); Eastern Research Group Inc. ($50,036,360); and General Dynamics Information Technology, Inc. ($45,735,677).
Which agencies buy the most under NAICS 541620?
The agencies that obligated the most under NAICS 541620 in fiscal years 2026 and 2027 are Environmental Protection Agency ($273,746,840), Department of Homeland Security ($200,655,712) and Department of the Army ($126,203,445).
Which PSC codes are used with NAICS 541620?
The PSC codes with the most obligated under NAICS 541620 in fiscal years 2026 and 2027 are F999 Other Environmental Services, Studies, and Analytical Support; R499 Other Professional Services; and B510 Environmental Studies and Assessments.
Where is the work under NAICS 541620 performed?
By place of performance, the states with the most contract obligations under NAICS 541620 over the last 12 months are Virginia ($116,226,004), Texas ($108,256,286) and Maryland ($92,854,968).
What is the latest contract opportunity under NAICS 541620?
The latest contract opportunity under NAICS 541620 is Defense Logistics Agency (DLA) Environmental Liabilities Management (ELM) Program Support, pre-solicitation from ENDIST Baltimore (USACE), posted November 6, 2026.
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