NAICS Code 221310: Water Supply and Irrigation Systems
National industry
SBA small business size standard: $41 million in average annual receipts
Definition
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.
Government contracts for this service: PSC S114 Water Services
Code facts
- Part of
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22
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221
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2213
- 22131
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2213
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221
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22
- Contract awards
- 447 In the last 12 months
- Contract obligations
- $752,594,383 In FY2025
NAICS codes and definitions come from the U.S. Census Bureau, size standards from the SBA and contract spending from SAM.gov/FPDS.
Business activities under NAICS 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
Looking for another activity? Search the NAICS code lookup or browse business activities from A to Z.
Contract obligations by fiscal year
| Fiscal year | Obligated |
|---|---|
| FY2027 To date | $6,034,521 |
| FY2026 | $543,061,088 |
| FY2025 | $752,594,383 |
| FY2024 | $623,372,176 |
| FY2023 | $565,680,556 |
Top contractors by obligations
| Rank | Contractor | Obligated, FY2026–FY2027 | Share |
|---|---|---|---|
| 1 | American Water Operations And Maintenance, LLC | $129,742,818 | |
| 2 | American Water Military Services, LLC | $43,151,304 | |
| 3 | Old North Utility Services, Inc. | $36,200,191 | |
| 4 | Ch2M Hill Constructors, Inc. | $29,040,662 | |
| 5 | Oklahoma City Water Utilities Trust | $23,782,700 | |
| 6 | Emerald Coast Utility Services Inc. | $20,528,264 | |
| 7 | Schutt Industries Of Clintonville, Wis., Inc. | $20,094,180 | |
| 8 | Washington Suburban Sanitary Commission | $14,767,044 | |
| 9 | Base Utilities Inc. | $14,493,949 | |
| 10 | Fort Bliss Water Services Company | $14,292,693 |
See the full FY2025 ranking of NAICS 221310 contractors, by parent company.
Top funding agencies by obligations
| Rank | Agency | Obligated, FY2026–FY2027 | Share |
|---|---|---|---|
| 1 | Department of the Army | $306,210,486 | |
| 2 | Air Force | $148,252,789 | |
| 3 | Department of Justice | $19,839,414 | |
| 4 | Department of Veterans Affairs | $17,888,013 | |
| 5 | Department of Health and Human Services | $15,370,193 | |
| 6 | National Aeronautics and Space Administration | $13,988,467 | |
| 7 | Department of the Interior | $9,928,106 | |
| 8 | Department of the Treasury | $4,585,025 | |
| 9 | Department of State | $4,324,595 | |
| 10 | International Boundary and Water Commission U.S.-Mexico | $2,213,350 |
Top PSC codes by obligations
| Rank | PSC code | Obligated, FY2026–FY2027 | Share |
|---|---|---|---|
| 1 | S114 Water Services | $463,545,623 | |
| 2 | 2330 Trailers | $20,094,180 | |
| 3 | J046 Maintenance, Repair and Rebuilding of Equipment: Water Purification and Sewage Treatment Equipment | $11,065,945 | |
| 4 | Z2NE Repair or Alteration of Water Supply Facilities | $9,461,621 | |
| 5 | 4610 Water Purification Equipment | $9,196,143 | |
| 6 | M1NE Operation of Water Supply Facilities | $8,813,154 | |
| 7 | H946 Other Quality Control, Testing and Inspection Services: Water Purification and Sewage Treatment Equipment | $4,258,007 | |
| 8 | Z1NE Maintenance of Water Supply Facilities | $2,943,334 | |
| 9 |
X1NE Lease/ |
$1,776,625 | |
| 10 | S119 Other Utilities | $1,761,268 |
Contract obligations by state
| Rank | Place of performance | Obligated, last 12 months | Share |
|---|---|---|---|
| 1 | Texas | $66,188,258 | |
| 2 | California | $46,653,634 | |
| 3 | North Carolina | $43,745,875 | |
| 4 | Florida | $36,273,961 | |
| 5 | Maryland | $33,839,928 | |
| 6 | Washington | $26,991,727 | |
| 7 | Ohio | $23,356,486 | |
| 8 | Kentucky | $21,850,731 | |
| 9 | Wisconsin | $20,099,046 | |
| 10 | Missouri | $17,385,220 | |
| 11 | Louisiana | $16,457,023 | |
| 12 | Georgia | $15,805,738 | |
| 13 | North Dakota | $14,515,576 | |
| 14 | Kansas | $12,331,789 | |
| 15 | Virginia | $11,346,143 | |
| 16 | New Jersey | $10,946,209 | |
| 17 | Utah | $8,483,142 | |
| 18 | Oklahoma | $8,338,613 | |
| 19 | Alabama | $7,786,143 | |
| 20 | Indiana | $6,787,625 | |
| 21 | Hawaii | $6,292,426 | |
| 22 | Massachusetts | $6,221,986 | |
| 23 | District of Columbia | $5,510,655 | |
| 24 | South Carolina | $5,201,947 | |
| 25 | Arizona | $3,671,112 | |
| 26 | West Virginia | $3,309,368 | |
| 27 | Illinois | $2,522,585 | |
| 28 | Colorado | $2,421,440 | |
| 29 | Arkansas | $1,922,779 | |
| 30 | Mississippi | $1,424,884 | |
| 31 | New York | $1,243,070 | |
| 32 | Pennsylvania | $1,133,771 | |
| 33 | Oregon | $1,010,391 | |
| 34 | Montana | $950,873 | |
| 35 | Nevada | $701,923 | |
| 36 | New Mexico | $526,008 | |
| 37 | Minnesota | $518,345 | |
| 38 | Nebraska | $515,345 | |
| 39 | Idaho | $386,948 | |
| 40 | Wyoming | $308,490 | |
| 41 | New Hampshire | $291,559 | |
| 42 | Tennessee | $213,926 | |
| 43 | Iowa | $172,819 | |
| 44 | Maine | $130,491 | |
| 45 | Guam | $123,000 | |
| 46 | Puerto Rico | $118,547 | |
| 47 | South Dakota | $104,107 | |
| 48 | Michigan | $76,338 | |
| 49 | Alaska | $30,000 | |
| 50 | Vermont | $28,296 | |
| 51 | Rhode Island | $13,623 |
Show all 51
Shares are of everything obligated under NAICS 221310 in the last 12 months before deobligations, including work performed abroad or with no place of performance on record.
Contract opportunities
Show 40 more
Latest 50 of 4,605 listed here. See the rest on GovTribe.
Size standard history
Federal Register rules that named this code
Proposed size standard changes
| Proposed rule | Published | Comments |
|---|---|---|
| Small Business Size Standards: Monetary-Based Industry Size Standards | Closed Oct 21, 2025No final rule found |
From the NAICS codes each rule's amendments to 13 CFR 121.201 name. Rules that print their size standard tables as images aren't listed.
Quick answers
What is NAICS 221310?
NAICS 221310 is Water Supply and Irrigation Systems, a national industry in NAICS 22, Utilities.
What is the NAICS code for water supply systems?
The NAICS code for water supply systems is 221310, Water Supply and Irrigation Systems.
What is the NAICS code for irrigation system operation?
The NAICS code for irrigation system operation is 221310, Water Supply and Irrigation Systems.
What is the NAICS code for canal, irrigation?
The NAICS code for canal, irrigation is 221310, Water Supply and Irrigation Systems.
When did the size standard for NAICS 221310 last change?
The most recent Federal Register rule on record that names NAICS 221310 in the SBA's size standards is "Small Business Size Standards: Adjustment of Monetary-Based Size Standards, Disadvantage Thresholds, and 8(a) Eligibility Thresholds for Inflation" (87 FR 69118), published Nov 17, 2022 and effective Dec 19, 2022.
How much do federal agencies spend under NAICS 221310?
Federal contracts under NAICS 221310 obligated $752,594,383 in fiscal year 2025 and $2,490,742,724 in fiscal years 2023 through 2027.
Who are the largest contractors under NAICS 221310?
The contractors with the most obligated under NAICS 221310 in fiscal years 2026 and 2027 are American Water Operations And Maintenance, LLC ($129,742,818); American Water Military Services, LLC ($43,151,304); and Old North Utility Services, Inc. ($36,200,191).
Which agencies buy the most under NAICS 221310?
The agencies that obligated the most under NAICS 221310 in fiscal years 2026 and 2027 are Department of the Army ($306,210,486), Air Force ($148,252,789) and Department of Justice ($19,839,414).
Which PSC codes are used with NAICS 221310?
The PSC codes with the most obligated under NAICS 221310 in fiscal years 2026 and 2027 are S114 Water Services; 2330 Trailers; and J046 Maintenance, Repair and Rebuilding of Equipment: Water Purification and Sewage Treatment Equipment.
Where is the work under NAICS 221310 performed?
By place of performance, the states with the most contract obligations under NAICS 221310 over the last 12 months are Texas ($66,188,258), California ($46,653,634) and North Carolina ($43,745,875).
What is the latest contract opportunity under NAICS 221310?
The latest contract opportunity under NAICS 221310 is NNMC Water testing, analysis, and filtration services for medical device processing, pre-solicitation from Indian Health Service, posted November 6, 2026.
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See everything under NAICS 221310
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