221310

Water Supply and Irrigation Systems

Utilities › Utilities › Water, Sewage and Other Systems

SBA Size Standard

$41M average annual receipts

Revenue-Based Verify at SBA.gov →

NAICS Code Hierarchy

22

Sector

Utilities

221

Subsector

Utilities

2213

Industry Group

Water, Sewage and Other Systems

221310

National Industry (This Code)

Water Supply and Irrigation Systems

Official NAICS Description

Source: U.S. Census Bureau 2022 NAICS

📘 Source: U.S. Census Bureau — 2022 NAICS Manual
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.

✓ Small Business Eligibility at a Glance

Based on SBA Table of Small Business Size Standards (2024)

Size Standard

$41M average annual receipts

Measurement Period

3-year average

Standard Type

Revenue-Based

Applies To

All contracts under NAICS 221310

Set-Aside Programs

8(a), WOSB, HUBZone, SDVOSB

Certification Required

No (self-certify in SAM.gov)

Size standards are set by the SBA and reviewed periodically. Always verify at SBA.gov before bidding.

Cross-References

The following activities are classified elsewhere in the NAICS system:

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.

How to Use NAICS 221310 in SAM.gov

NAICS code 221310Water Supply and Irrigation Systems — is used in SAM.gov to identify businesses whose primary activity falls within this classification. When you add this code to your SAM.gov entity registration, contracting officers searching for vendors in the Water, Sewage and Other Systems space will be able to find your business.

If this code represents your primary business activity, designate it as your primary NAICS code. Your primary NAICS code determines your size standard for any contract solicited under this code. With a size standard of $41M average annual receipts, your business must be at or below this threshold to qualify as a small business for set-aside contracts under NAICS 221310.

Log in Entity Registration Goods & Services Add NAICS Code Enter 221310 Save

Frequently Asked Questions

What is NAICS code 221310?

NAICS code 221310 is 'Water Supply and Irrigation Systems', classified under the Utilities sector (NAICS 22). 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, an

What is the SBA small business size standard for NAICS code 221310?

The SBA defines a small business under NAICS code 221310 (Water Supply and Irrigation Systems) as one with $41M average annual receipts. This size standard determines eligibility for small business set-aside contracts, 8(a), HUBZone, WOSB, and SDVOSB programs in SAM.gov.

How do I register NAICS code 221310 in SAM.gov?

To register NAICS code 221310 in SAM.gov: (1) Log in at sam.gov, (2) Navigate to your Entity Registration, (3) Go to the Assertions section, (4) Add 221310 (Water Supply and Irrigation Systems) to your NAICS code list. You may designate one code as your Primary NAICS code.

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Related NAICS Codes

Other codes in Water, Sewage and Other Systems

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