Registry · NAICS Index · Sector 22

221310 — Water Supply and Irrigation Systems

NAICS 221310 is 'Water Supply and Irrigation Systems', a 2022 U.S. national industry under Sector 22 (Utilities); the SBA small-business size standard is $41,000,000.

Description

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.

Exclusions & Cross-References

  • Establishments primarily engaged in irrigation project construction (except lawn) are classified in Industry
  • 237110, Water and Sewer Line and Related Structures Construction;
  • Establishments primarily engaged in installing lawn sprinkler systems are classified in Industry 238220,
  • Plumbing, Heating, and Air-Conditioning Contractors;
  • Establishments primarily engaged in lawn irrigation services are classified in Industry 561730,
  • Landscaping Services;
  • Establishments primarily engaged in retailing bottled water are classified in U.S. Industry 445298, All
  • Other Specialty Food Retailers; and
  • Government establishments primarily engaged in administering irrigation districts are classified in Industry
  • 926130, Regulation and Administration of Communications, Electric, Gas, and Other Utilities.

Overview Facts

NAICS Code221310
Industry TitleWater Supply and Irrigation Systems
SBA Size Standard$41,000,000
IRS PBA Code221300 (rolled-up match)
Sectors HierarchySector 22 → 221 → 2213
Source / VerifiedUS Census 2022 NAICS Manual / 2026-06-28
NAICS Structure: 221310 National Industry
Sector (2)
22
Utilities
Subsector (3)
221
Utilities
Industry Group (4)
2213
Water, Sewage and Other Systems
Industry (5)
22131
Water Supply and Irrigation Systems
National Industry (6)
221310
Water Supply and Irrigation Systems

Legacy SIC Concordance

Trace the historical mapping chain from the 1987 Standard Industrial Classification (SIC) to the modern 2022 NAICS code format.

  • SIC 4941 - Water Supply (via SIC1987:4941→NAICS1997:22131→2002:221310→2007:221310→2012:221310→2017:221310→2022:221310)
  • SIC 4971 - Irrigation Systems (via SIC1987:4971→NAICS1997:22131→2002:221310→2007:221310→2012:221310→2017:221310→2022:221310)

Related Resources & Compliance Guides

Further regulatory reference links for NAICS code 221310:

Related Industries in 2213

221320 - Sewage Treatment Facilities...221330 - Steam and Air-Conditioning Supply...

Frequently Asked Questions (FAQ)

Is 221310 a valid 2022 NAICS code?

NAICS 221310 is 'Water Supply and Irrigation Systems', a 2022 U.S. national industry under Sector 22 (Utilities); the SBA small-business size standard is $41,000,000.

What is the SBA size standard for NAICS 221310?

The SBA small business size standard for NAICS 221310 is $41,000,000 (based on receipts).

What is the legacy SIC code mapping for 221310?

NAICS code 221310 maps to the legacy 1987 SIC codes: 4941 - Water Supply, 4971 - Irrigation Systems.