The NAICS code for plumbing is 238220, Plumbing, Heating, and Air-Conditioning Contractors.
Also searched as: plumber, plumbing contractor.
Best match
Businesses primarily engaged in installing and servicing plumbing, heating, and air-conditioning equipment.
Census NAICS lines under 238220 that match plumbing:
238220, Plumbing, Heating, and Air-Conditioning Contractors. Businesses primarily engaged in installing and servicing plumbing, heating, and air-conditioning equipment.
The one on the solicitation. Federal agencies assign one NAICS code to each solicitation, and the SBA size standard of that code decides whether you count as a small business for that bid.
Source: U.S. Census Bureau, 2022 NAICS (public domain). PublicBeam is independent and not affiliated with the Census Bureau or any agency. Always check the NAICS code in the official notice before you bid.