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NAICS classification guide

Government Contracting Guide for NAICS 5621

How contractors can verify, register, search, and position work associated with NAICS 5621.

Data source: USAspending.gov FY2024Reviewed: August 2, 2026Educational guidance · verify current requirements with the issuing agency

Industries connected to NAICS 5621

Environmental & Remediation Companies

Use the code accurately

  1. Confirm the current definition using the official U.S. Census NAICS reference.
  2. Add the code to SAM.gov only when it accurately represents your business activity.
  3. Search SAM.gov Contract Opportunities by NAICS, agency, and place of performance.
  4. Connect the code to matching experience in your capability statement.

NAICS classifications and agency interpretations can change. Verify the current code and solicitation requirements before relying on this educational guide.

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FAQ

What does NAICS 5621 cover?

In the BidReady data system, NAICS 5621 is associated with Environmental & Remediation Companies. Confirm the full current definition and the best code for your exact work with the U.S. Census NAICS reference and the issuing agency.

Where should I use NAICS 5621?

Businesses use accurate NAICS codes in SAM.gov registrations, capability statements, market research, and opportunity searches. Only select codes that genuinely match the work performed.

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