> Enrich.chat gives AI agents verified work emails and mobiles. To use it from an agent, read https://enrich.chat/agents.md . This is the Markdown version of https://enrich.chat/naics/221310/ # NAICS code 221310: Water Supply and Irrigation Systems The companies classified under NAICS 221310, where they are based, how big they are and how the code maps to SIC. By Enrich.chat Editorial. Updated October 22, 2026. **Short answer:** NAICS 221310 is the code for Water Supply and Irrigation Systems, in sector 22: Utilities. The companies counted under it are mostly small: 68% have 200 or fewer employees, and 59% are headquartered in the United States. ## What is NAICS 221310? NAICS 221310 is the code for Water Supply and Irrigation Systems. It belongs to sector 22: Utilities. NAICS, the North American Industry Classification System, is the standard U.S. government agencies use to sort businesses by what they mainly do, and each digit narrows the category. Most of the companies counted also carry SIC 4941, Water supply service, in the older SIC system (70%). NAICS is a North American system, so companies outside the US, Canada and Mexico are placed in it by classification. - 41% of the companies counted have 50 or fewer employees, and the middle one is in the 51 to 200 range. - The largest group is headquartered in the United States (59%). Within the US, California is the biggest state (20%). - Most were founded in the before 1960 (31%), then the 2000s (24%). **Figure: How NAICS 221310 is built.** The code 221310 split into its parts: sector 22, then subsector, industry group, NAICS industry and U.S. industry. *The six digits of NAICS 221310. Each digit narrows the category.* ## Which companies are classified under NAICS 221310? The biggest by headcount range include SAUR, Uniper, Anglian Water Services, Netze Bw and Water. Names link to a company profile where we have one. | Company | Headquarters | Employees | | --- | --- | --- | | [SAUR](https://enrich.chat/company/saur/) | Issy-Les-Moulineaux, France | 10,001+ | | Uniper | Dusseldorf, Germany | 5,001 to 10,000 | | Netze Bw | Stuttgart, Germany | 5,001 to 10,000 | | Water | Leederville, Australia | 1,001 to 5,000 | | Wessex Water | Bath, United Kingdom | 1,001 to 5,000 | | Maynilad Water Services | Quezon City, Philippines | 1,001 to 5,000 | | South West Water | Exeter, United Kingdom | 1,001 to 5,000 | | Epal Empresa Portuguesa Das Águas Livres | Lisboa, Portugal | 1,001 to 5,000 | | Vitens | Zwolle, Netherlands | 1,001 to 5,000 | | Dc Water | Washington, DC | 1,001 to 5,000 | | Northern Ireland Water | Belfast, United Kingdom | 1,001 to 5,000 | | Denver Water | Denver, CO | 1,001 to 5,000 | | Aguas Bonaerenses | La Plata, Argentina | 1,001 to 5,000 | | Stad Kortrijk | Kortrijk, Belgium | 1,001 to 5,000 | | Pennon Group | Exeter, United Kingdom | 1,001 to 5,000 | | Veolia Eau D'ile-De-France | Nanterre, France | 1,001 to 5,000 | | Swb | Bremen, Germany | 1,001 to 5,000 | | Aguas Santafesinas | Santa Fe, Argentina | 1,001 to 5,000 | | Washtenaw County | Ann Arbor, MI | 1,001 to 5,000 | | Pennsylvania American Water | Mechanicsburg, PA | 1,001 to 5,000 | | Waternsw | Sydney, Australia | 501 to 1,000 | | Eau De Paris | Paris, France | 501 to 1,000 | | Hunter Water | Newcastle, Australia | 501 to 1,000 | | Sunwater | Fortitude Valley, Australia | 501 to 1,000 | | Power And Water | Darwin, Australia | 501 to 1,000 | The table shows the 25 biggest by headcount range, with ties broken by audience size. The charts and percentages below cover every company counted for this page, not just these 25, and companies with fewer than 11 employees are not counted. Headquarters is the location on each company's public profile. ## Where are NAICS 221310 companies based? The largest groups are headquartered in the United States (59%), Germany (9%) and the United Kingdom (8%). **Figure: Where companies in NAICS 221310 are based.** Bars for the share of counted companies in NAICS 221310 headquartered in each country: United States 59%, Germany 9%, United Kingdom 8%, Italy 6%, Australia 4%, Belgium 2%, Canada 2%, France 2%. *Share of counted companies in NAICS 221310 by headquarters country.* Within the United States, California (20%), Texas (14%) and Colorado (7%) lead. **Figure: US headquarters of companies in NAICS 221310, by state.** A tile map of the United States shaded by the share of counted US companies in NAICS 221310 headquartered in each state. The largest are California 20%, Texas 14%, Colorado 7%. *Share of counted US companies in NAICS 221310 by headquarters state. The three largest states are outlined.* ## How big are the companies counted for NAICS 221310? 41% of them have 50 or fewer employees, and the middle one is in the 51 to 200 range. Companies with fewer than 11 employees are not counted. **Figure: Size of companies in NAICS 221310.** Seven columns for the share of counted companies in NAICS 221310 in each employee range: 11 to 50 41%, 51 to 200 27%, 201 to 500 13%, 501 to 1,000 8%, 1,001 to 5,000 9%, 5,001 to 10,000 1%, 10,001+ 0%. *Share of counted companies in NAICS 221310 in each employee range.* ## How old are NAICS 221310 companies? Most were founded in the before 1960 (31%), then the 2000s (24%). **Figure: When companies in NAICS 221310 were founded.** Eight columns for the share of counted companies in NAICS 221310 founded in each era: Before 1960 31%, 1960s 5%, 1970s 5%, 1980s 8%, 1990s 12%, 2000s 24%, 2010s 15%, 2020s 0%. *Share of counted companies in NAICS 221310 by the era they were founded in, for the ones that list a founding year.* ## How NAICS 221310 compares - 41% of companies in NAICS 221310 have 50 or fewer employees, against 60% across all NAICS codes on this site. - 15% were founded in 2010 or later, against 30% across all NAICS codes on this site. - Colorado holds 7% of the US companies here, against 2% across all NAICS codes on this site. ## How do NAICS 221310 companies describe themselves? A code is assigned by classification, and a company does not choose its own, so the label a company uses for itself can differ. The most common labels here are Utilities (71%), Environmental Services (10%) and Construction (7%). **Figure: How companies in NAICS 221310 describe themselves.** Bars for the share of counted companies in NAICS 221310 that give each industry on their public profile: Utilities 71%, Environmental Services 10%, Construction 7%, Government Administration 5%. *Share of counted companies in NAICS 221310 by the industry they list on their public profile.* ## NAICS 221310 and the SIC system NAICS replaced SIC in 1997, but the two do not line up one to one: companies filed under one NAICS code can carry several SIC codes. These are the ones seen most. | Code | Title | Share of counted | | --- | --- | --- | | SIC 4941 | Water supply service | 70% | | SIC 4971 | Irrigation system | 10% | | SIC 4931 | Electric and other services combined | 5% | | SIC 4952 | Sewerage system | 4% | | SIC 4911 | Electric services | 4% | ## Where NAICS codes come from NAICS is maintained by the U.S. Census Bureau with Canada and Mexico and revised every five years; the current edition is NAICS 2022. To check exactly what a code includes, search the [official NAICS index](https://www.census.gov/naics/) or read the Census Bureau's [guide to understanding NAICS](https://www.census.gov/programs-surveys/economic-census/year/2022/guidance/understanding-naics.html). Pick a code by what a company mostly does, not by who it sells to. ## How do you reach the people at NAICS 221310 companies? The people to talk to are usually operations, procurement and IT leaders. You can build the list from this code in three prompts to your AI agent. ### 1. Count them (free) Counting who matches never uses credits. ```text Use www.enrich.chat to count the companies with NAICS code 221310 (Water Supply and Irrigation Systems) ``` ### 2. Find the people (5 credits per person) Name the roles you sell to. Each person returned is 5 credits, and name, title and company are included. ```text Use www.enrich.chat to find the operations, procurement and IT leaders at companies with NAICS code 221310, with their titles ``` ### 3. Get their work emails (10 credits each) An email is 10 credits only when one is found. Every email comes with a status: verified, catch-all or unknown. ```text Use www.enrich.chat to find the work emails for these people and tell me which ones are verified ``` ## More to explore Others in sector 22: [NAICS 221122: Electric Power Distribution](https://enrich.chat/naics/221122/)[NAICS 221118: Other Electric Power Generation](https://enrich.chat/naics/221118/) ## Frequently asked questions ### What is NAICS code 221310? NAICS 221310 is the code for Water Supply and Irrigation Systems, in sector 22: Utilities. ### What is the SIC code for NAICS 221310 (Water Supply and Irrigation Systems)? 70% of the companies counted carry SIC 4941 (Water supply service), but the two systems do not map one to one. ### Which companies are classified under NAICS 221310? The biggest by headcount range include SAUR, Uniper, Anglian Water Services, Netze Bw and Water. The page lists 25 with links to their profiles where we have them. ### Where are NAICS 221310 companies based? The largest groups are headquartered in the United States (59%), Germany (9%) and the United Kingdom (8%). ### How big are the companies in NAICS 221310? 41% have 50 or fewer employees, and the middle one is in the 51 to 200 range. Companies with fewer than 11 employees are not counted. ### Is NAICS 221310 the same as a SIC code? No. NAICS replaced SIC as the U.S. federal standard in 1997, and the two do not map one to one. The SIC code seen most among these companies is 4941. ## Try this prompt Find the people at NAICS 221310 companies ```text Use www.enrich.chat to find the operations, procurement and IT leaders at companies with NAICS code 221310, with titles and verified work emails ``` ## Related - [Companies using a technology](https://enrich.chat/companies-using/) - [Tech stack lookup](https://enrich.chat/tools/tech-stack-lookup/)