Architect and Engineering—General: Plumbing Systems
Possible NAICS Codes
541330 – Engineering Services
541310 – Architectural Services
238220 – Plumbing, Heating, and Air-Conditioning Contractors
236220 – Commercial and Institutional Building Construction
237110 – Water and Sewer Line and Related Structures Construction
321211 – Hardwood Veneer and Plywood Manufacturing
561210 – Facilities Support Services