NAICS 221310 size standard: Water Supply and Irrigation Systems
Sector 22—Utilities › Subsector 221—Utilities
$41.0 million
average annual receipts
A business whose primary industry is NAICS 221310 (Water Supply and Irrigation Systems) is small for SBA and federal contracting purposes if its average annual receipts, including affiliates, are no more than $41.0 million.
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NAICS 221310 on AwardWatchdog
Before you rely on this
- Affiliates count. SBA adds the receipts or employees of your affiliates (companies that control you, that you control, or that share common ownership or management) to yours. See 13 CFR 121.103.
- Receipts are a 5-year average. Average annual receipts are generally your total receipts over your last 5 completed fiscal years divided by 5 (13 CFR 121.104).
- Employees are a 24-month average. Employee-based standards use your average number of employees per pay period over the preceding 24 completed calendar months, counting part-time and temporary staff (13 CFR 121.106).
- The contract decides the code. For a federal contract, the contracting officer assigns one NAICS code in the solicitation, and that code’s size standard is the one that counts.
- Check officially. Use the official SBA Size Standards Tool and keep your SAM.gov registration current.
Not legal or professional advice. This is a free estimate from AwardWatchdog based on SBA’s published table. AwardWatchdog is not affiliated with SBA or the U.S. government. Only SBA can make a formal size determination.
Common questions
What is the SBA size standard for NAICS 221310?
A business whose primary industry is NAICS 221310 (Water Supply and Irrigation Systems) is small for SBA and federal contracting purposes if its average annual receipts, including affiliates, are no more than $41.0 million. The standard comes from SBA’s table at 13 CFR 121.201 (last amended effective March 17, 2023).
How are average annual receipts calculated?
Generally, total receipts over the most recently completed 5 fiscal years divided by 5, including affiliates (13 CFR 121.104). Firms in business for less than 5 years use a different calculation.
Is this an official size determination?
No. This page is an estimate from AwardWatchdog based on SBA’s published table. Use the official SBA Size Standards Tool at sba.gov and only SBA can make a formal size determination.
Related codes in Utilities
221111 Hydroelectric Power Generation (750 employees) · 221112 Fossil Fuel Electric Power Generation (950 employees) · 221113 Nuclear Electric Power Generation (1,150 employees) · 221114 Solar Electric Power Generation (500 employees) · 221115 Wind Electric Power Generation (1,150 employees) · 221116 Geothermal Electric Power Generation (250 employees) · 221117 Biomass Electric Power Generation (550 employees) · 221118 Other Electric Power Generation (650 employees) · 221121 Electric Bulk Power Transmission and Control (950 employees) · 221122 Electric Power Distribution (1,100 employees) · 221210 Natural Gas Distribution (1,150 employees) · 221320 Sewage Treatment Facilities ($35.0M)
Source: 13 CFR 121.201 (SBA table of small business size standards, eCFR current as of October 15, 2026; last amended effective March 17, 2023). See also SBA’s table of size standards.
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