NAICS 237110: Water and Sewer Line and Related Structures Construction
Water and Sewer Line and Related Structures Construction is NAICS code 237110. A business is small under it with $45 million or less in average annual receipts. 34 federal contracts are open on SAM.gov under this code right now.
- SBA size standard
- $45 million or less in average annual receipts
- Open contracts now
- 34
- Federal spending, FY2025
- $973.2 million
- Share won by small businesses
- 39%
- Small businesses registered
- 5,629
Open federal contracts for water and sewer line and related structures construction
- Rehabilitation of Water and Wastewater System
Due in 2 daysOct 7, 2026
- Fort Mifflin Sewage Lift Station
Due in 3 daysOct 8, 2026
- BRCA 318695 - CONSTRUCTION
Due in 3 daysOct 8, 2026
- Design-Build Repair Storm Sewer Lines @ CG Base San Juan, PR PN 15852459
Due in 4 daysOct 9, 2026
- Loleta Water System Upgrades
✦ The U.S. Forest Service is asking for quotes to upgrade the water system at the Loleta Recreation Area in Marienville, PA: new water pipe, spigots, valves, concrete work, a well…
Due in 7 daysOct 12, 2026
- Upgrade Water Tanks - FCI Texarkana, Tx
✦ The Federal Bureau of Prisons wants a contractor to rebuild the water storage and distribution system at the Federal Correctional Institution in Texarkana, Texas.
Due in 8 daysOct 13, 2026
What NAICS 237110 covers
The Census Bureau's NAICS index lists these kinds of work under 237110:
- Aqueduct construction
- Artesian well construction
- Capping of water wells
- Construction management, water and sewage treatment plant
- Distribution line, sewer and water, construction
- Drilling water wells (except water intake wells in oil and gas fields)
- Fire hydrant installation
- Geothermal drilling
- Hydrant and flushing hydrant installation
- Irrigation project construction (except lawn)
- Lagoon, sewage treatment construction
- Pumping station, water and sewage system, construction
- Reservoir construction
- Sanitary sewer construction
The index lists 31 entries for this code in all.
Read the full definition, including what's excluded, on census.gov.
SBA size standard for 237110
To count as a small business for a contract assigned NAICS 237110, your business must have $45 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 and sewer line and related structures construction
Agencies that awarded the most under NAICS 237110 over the last three fiscal years, per USAspending.gov:
| Agency | Obligated |
|---|---|
| Bureau of Reclamation | $1.1 billion |
| National Park Service | $614.8 million |
| International Boundary and Water Commission: U.S.-Mexico | $553.9 million |
| Department of the Army | $552.6 million |
| Department of the Navy | $277.9 million |
| Department of Veterans Affairs | $143.5 million |
| Department of the Air Force | $87.8 million |
| Agency for International Development | $77.4 million |
Open notices right now come from Department of the Interior (14), Dept of Defense (11), Department of Agriculture (3), Department of Veterans Affairs (2), Department of Health and Human Services (2) and Department of Justice (2).
Set-asides on open 237110 contracts
- Total small business set-aside: 20
- No set-aside (full and open): 13
- Service-disabled veteran-owned set-aside: 1
- Service-disabled veteran-owned sole source: 1
Not sure which set-asides you qualify for? Try the free SBA certification screener, or read set-aside contracts, explained.
Your competition
5,629 businesses with active SAM.gov registrations are rated small under NAICS 237110, most of them in Texas (534), California (521), Florida (411), Washington (198) and Virginia (174). Look any of them up with the free CAGE code and UEI lookup.
Federal spending under 237110 by year
| Fiscal year | Contract obligations |
|---|---|
| FY2024 | $1.2 billion |
| FY2025 | $973.2 million |
| FY2026 | $1.6 billion |
| FY2027 (so far) | $0 |
Source: USAspending.gov, all contract awards with this NAICS code. Fiscal years start October 1.
Related NAICS codes
- 237120 Oil and Gas Pipeline and Related Structures Construction
- 237130 Power and Communication Line and Related Structures Construction
Frequently asked questions
What is NAICS code 237110?
237110 is the 2022 NAICS code for Water and Sewer Line and Related Structures Construction. The Census Bureau's index lists work such as aqueduct construction, artesian well construction, capping of water wells under it. Federal contracting uses the 2022 codes.
What is the SBA size standard for NAICS 237110?
$45 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 and sewer line and related structures construction?
Yes. 34 federal contract opportunities under NAICS 237110 are open on SAM.gov right now. Agencies obligated about $973.2 million under this code in fiscal year 2025, according to USAspending.gov.
How do I add NAICS code 237110 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
- Government construction contracts, across every related code
- 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.