# NAICS code for water treatment The NAICS code for water treatment is 221310 (Water Supply and Irrigation Systems). Its SBA small business size standard is $41 million in average annual receipts. This industry comprises establishments primarily engaged in operating water treatment plants and/or operating water supply systems. List 221310 as your primary NAICS code in SAM.gov if water treatment is your main line of business.Source: NAICS 2022 (Census).Official source: [U.S. Census Bureau NAICS](https://www.census.gov/naics/) | Industry | Water Treatment | | --- | --- | | Primary NAICS | [221310](https://samgovapi.io/naics/221310) | | Title | Water Supply and Irrigation Systems | | Size standard | $41 million in average annual receipts (13 CFR 121.201) | ## Nearby codes in the same industry group | Code | Title | Size standard | | --- | --- | --- | | [221310](https://samgovapi.io/naics/221310) | Water Supply and Irrigation Systems | $41 million in average annual receipts | | [221320](https://samgovapi.io/naics/221320) | Sewage Treatment Facilities | $35 million in average annual receipts | | [221330](https://samgovapi.io/naics/221330) | Steam and Air-Conditioning Supply | $30 million in average annual receipts | ## What NAICS 221310 covers This industry comprises establishments primarily engaged in operating water treatment plants and/or operating water supply systems. The water supply system may include pumping stations, aqueducts, and/or distribution mains. The water may be used for drinking, irrigation, or other uses. ## Examples classified under 221310 - Canal, irrigation - Filtration plant, water - Impounding reservoirs, irrigation - Irrigation system operation - Water distribution (except irrigation) - Water distribution for irrigation - Water filtration plant operation - Water supply systems ## Get this as JSON ``` curl "https://samgovapi.io/api/v1/naics/221310" \ -H "Authorization: Bearer sg_YOUR_KEY" ``` MCP tool: `naics_lookup`Keys start free, with no card. [Get a free API key](https://samgovapi.io/sign-up) or read the [docs](https://samgovapi.io/docs). ## Questions What is the NAICS code for water treatment?The NAICS code most used for water treatment is 221310, Water Supply and Irrigation Systems.Is a water treatment business small for federal contracts?For NAICS 221310, a business is small at or under $41 million in average annual receipts (13 CFR 121.201), counting affiliates.Can I list more than one NAICS code?Yes. A SAM.gov registration can list many NAICS codes with one marked primary; each solicitation names the single code that applies to it. ## Related - [NAICS 221310](https://samgovapi.io/naics/221310) - [NAICS code lookup](https://samgovapi.io/naics-code-lookup) - [Size standard checker](https://samgovapi.io/size-standard-checker) - [NAICS code for an industry](https://samgovapi.io/naics-code-for)Independent. Not affiliated with, endorsed by or sponsored by GSA, SAM.gov or any U.S. government agency. Registering in SAM.gov is free at sam.gov.

---

HTML version: https://samgovapi.io/naics-code-for/water-treatment . Markdown: https://samgovapi.io/naics-code-for/water-treatment.md

Independent. Not affiliated with, endorsed by or sponsored by GSA, SAM.gov or any U.S. government agency. Registering in SAM.gov is free at sam.gov.

Get a free API key: https://samgovapi.io/sign-up?ref=ai-claudebot