NAICS Code 221310: Water Supply and Irrigation Systems
NAICS code 221310 is the industry for water supply and irrigation systems in the Utilities sector. Agencies tag every federal contract with a NAICS code, so this is the code to list in your SAM.gov registration and to search for bids.
Government contracts under NAICS 221310
Federal agencies obligated $1.9B on contracts under NAICS 221310 from FY2024 to FY2026, including $544M in FY2026. The biggest buyers were the Department of Defense, the Department of Justice, the Department of Health and Human Services. The largest contractors were American Water Operations and Maintenance, LLC, American Water Military Services, LLC, Old North Utility Services, Inc..
See the full breakdown: government water supply and irrigation systems contracts, who wins and who buys.
Open government bids for NAICS 221310
The newest open notices from SAM.gov. Bidding needs a free SAM.gov registration.
- Water system MaintenanceClosing soon
Veterans Affairs, Department of · Sources Sought · NAICS 221310 · WA · Small Business Set Aside - Total
Posted Oct 30, 2026 · Responses due Nov 6, 2026
Small business size standard for NAICS 221310
To bid on small business set-aside contracts under NAICS 221310, your business must be small under the SBA size standard for this code, measured either by average annual receipts or by number of employees. The values are updated periodically, so check the current SBA table of size standards before you bid.
Other NAICS codes in 2213
How to choose the right NAICS code
Pick the 6-digit code that best describes what you sell. List it as your primary code in SAM.gov, and add other codes for related work. Agencies choose one NAICS code for each contract, so check the codes on past awards for the kind of work you do. Search all codes in the NAICS code lookup.
Related guides
Frequently asked questions
- What is NAICS code 221310?
- NAICS 221310 is the industry "Water Supply and Irrigation Systems" in the North American Industry Classification System, part of the Utilities sector (22).
- What is the size standard for NAICS 221310?
- The SBA sets a small business size standard for each NAICS code, either average annual receipts or number of employees. Check the current value for 221310 in the SBA table of size standards on sba.gov; it changes from time to time.
- Are there government contracts for NAICS 221310?
- Yes. Federal agencies obligated $1.9B on contracts under NAICS 221310 from FY2024 to FY2026, and 1 notices are open right now.