NAICS 221320 is a North American Industry Classification System code. Federal buyers use NAICS for market research, set-aside size standards, and reporting. Official titles come from the Census Bureau NAICS structure.
- Official title
- Sewage Treatment Facilities
- Code level
- 6
- Parent industry
- 22132 — Sewage Treatment Facilities
- Open opportunities
- 7 open · 19 active