NAICS 221310: Water Supply and Irrigation Systems
Water Supply and Irrigation Systems is NAICS code 221310. A business is small under it with $41 million or less in average annual receipts. 4 federal contracts are open on SAM.gov under this code right now.
- SBA size standard
- $41 million or less in average annual receipts
- Open contracts now
- 4
- Federal spending, FY2026
- $532.2 million
- Share won by small businesses
- 15%
- Small businesses registered
- 1,891
Open federal contracts for water supply and irrigation systems
- FA8601 - Industrial Water Treatment at Wright-Patterson AFB
Due in 4 daysOct 9, 2026
- Water Treatment, Maintenance, & Monitoring Services - VA Black Hills Health Care System - Hot Springs VA Medical Center
Due in 4 daysOct 9, 2026
- FCC Yazoo City FY 2027 Water Treatment Services
Due in 11 daysOct 16, 2026
- Utilities Privatization of the Water System at U.S. Army Garrison-Hawaii (USAG-HI), Island of Oahu
Due in 95 daysJan 7, 2027
What NAICS 221310 covers
The Census Bureau's NAICS index lists these kinds of work 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
- Water treatment and distribution
- Water treatment plants
Read the full definition, including what's excluded, on census.gov.
SBA size standard for 221310
To count as a small business for a contract assigned NAICS 221310, your business must have $41 million or less in average annual receipts. Receipts are averaged over your last five completed fiscal years.
From SBA's table of size standards, effective Mar 17, 2023. Confirm it with SBA's size standards tool before you certify your size.
Who buys water supply and irrigation systems
Agencies that awarded the most under NAICS 221310 over the last three fiscal years, per USAspending.gov:
| Agency | Obligated |
|---|---|
| Defense Logistics Agency | $1.2 billion |
| Department of the Army | $338.3 million |
| Federal Prison System / Bureau of Prisons | $59.7 million |
| Department of Veterans Affairs | $56.7 million |
| National Institutes of Health | $51.4 million |
| Department of the Air Force | $50.8 million |
| National Aeronautics and Space Administration | $28.4 million |
| Department of State | $26.7 million |
Open notices right now come from Dept of Defense (2), Environmental Protection Agency (1), Department of Justice (1) and Department of Veterans Affairs (1).
Set-asides on open 221310 contracts
- No set-aside (full and open): 3
- Total small business set-aside: 2
Not sure which set-asides you qualify for? Try the free SBA certification screener, or read set-aside contracts, explained.
Your competition
1,891 businesses with active SAM.gov registrations are rated small under NAICS 221310, most of them in California (260), Texas (178), Florida (136), Washington (73) and Arizona (66). Look any of them up with the free CAGE code and UEI lookup.
Federal spending under 221310 by year
| Fiscal year | Contract obligations |
|---|---|
| FY2024 | $619.7 million |
| FY2025 | $743.4 million |
| FY2026 | $532.2 million |
| FY2027 (so far) | $1.7 million |
Source: USAspending.gov, all contract awards with this NAICS code. Fiscal years start October 1.
Related NAICS codes
Frequently asked questions
What is NAICS code 221310?
221310 is the 2022 NAICS code for Water Supply and Irrigation Systems. The Census Bureau's index lists work such as canal, irrigation, filtration plant, water, impounding reservoirs, irrigation under it. Federal contracting uses the 2022 codes.
What is the SBA size standard for NAICS 221310?
$41 million or less in average annual receipts. A business at or under that is small for contracts assigned this code. The current SBA table took effect Mar 17, 2023.
Are there government contracts for water supply and irrigation systems?
Yes. 4 federal contract opportunities under NAICS 221310 are open on SAM.gov right now. Agencies obligated about $532.2 million under this code in fiscal year 2026, according to USAspending.gov.
How do I add NAICS code 221310 to my SAM.gov registration?
Update your entity registration on SAM.gov and add the code on the Goods and Services page, in the Assertions section. You can list several NAICS codes and mark one as your primary. Changes are free.
Keep going
- Search other NAICS codes by keyword or company
- How to choose NAICS codes for government contracts
- NAICS codes with the most open federal contracts
FedReady is an independent company, not affiliated with SBA, SAM.gov, the Census Bureau or any government agency. Open-contract counts come from SAM.gov and update daily; spending figures come from USAspending.gov.