NAICS 541620: Environmental Consulting Services — Federal Contracts

What NAICS 541620 covers

The North American Industry Classification System (NAICS) is the standard the federal government uses to classify the industry of every contractor and every procurement. NAICS 541620 identifies businesses primarily engaged in environmental consulting services. When a contracting officer publishes a solicitation on SAM.gov, they tag it with the NAICS code that best matches the work — which is why getting your NAICS portfolio right inside SAM is the single most important step for showing up in agency searches.

Who buys NAICS 541620?

The federal agencies awarding the most contract value to vendors in this NAICS, based on 24 contractors tracked in the Mindy contractor database:

1. 1Environmental Protection Agency
2. 2Dept Of The Army
3. 3Dept Of The Navy
4. 4Department Of
5. 5Energy

Source: aggregated from the Mindy contractor database (prime contractor disclosures via SBA + agency directories).

Top contractors in NAICS 541620

The largest prime contractors associated with NAICS 541620, ranked by total reported federal contract value. These are your most likely incumbents — and your most likely teaming partners on recompetes:

1. 1
   Aptim Federal Services LLC

   $1.1B total reported value
2. 2
   Aecom Technical Services INC.

   $649.3M total reported value
3. 3
   Research Triangle Institute INC

   $546.0M total reported value
4. 4
   Weston Solutions Holdings INC

   $512.1M total reported value
5. 5
   Tetra Tech INC.

   $348.9M total reported value
6. 6
   Eastern Research Group, INC.

   $245.9M total reported value
7. 7
   Icf International INC.

   $198.3M total reported value
8. 8
   The Cadmus Group LLC

   $186.0M total reported value

Values reflect each contractor's aggregate reported federal contract value (across all of their NAICS codes, not just 541620). Use as a ranking signal, not as a per-NAICS award total.