NAICS Code 221320: Sewage Treatment Facilities
National industry
SBA small business size standard: $35 million in average annual receipts
Definition
This industry comprises establishments primarily engaged in operating sewer systems or sewage treatment facilities that collect, treat, and dispose of waste.
Government contracts for this service: PSC S119 Other Utilities and PSC S114 Water Services
Code facts
- Part of
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22
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221
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2213
- 22132
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2213
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221
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22
- Contract awards
- 144 In the last 12 months
- Contract obligations
- $237,935,687 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 221320
- Collection, treatment, and disposal of waste through a sewer system
- Sewage disposal plants
- Sewage treatment plants or facilities
- Sewer systems
- Waste collection, treatment, and disposal through a sewer system
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 | $3,388,980 |
| FY2026 | $200,920,537 |
| FY2025 | $237,935,687 |
| FY2024 | $222,425,604 |
| FY2023 | $187,363,518 |
Top contractors by obligations
| Rank | Contractor | Obligated, FY2026–FY2027 | Share |
|---|---|---|---|
| 1 | Veolia Water West Operating Services Inc. | $30,992,730 | |
| 2 | Aqua Engineers Inc. | $24,466,817 | |
| 3 | Foreign Utility Consolidated Reporting | $21,281,642 | |
| 4 | Nikken Sogyo Co., LTD. | $14,110,472 | |
| 5 | American Water Military Services, LLC | $12,179,996 | |
| 6 | Old Dominion Utility Services, Inc. | $8,991,851 | |
| 7 | City Of Aberdeen | $7,576,574 | |
| 8 | American States Utility Services Inc. | $6,650,413 | |
| 9 | South Granville Water & Sewer Auth | $5,994,284 | |
| 10 | Riverbend Water Resources District | $4,958,000 |
See the full FY2025 ranking of NAICS 221320 contractors, by parent company.
Top funding agencies by obligations
| Rank | Agency | Obligated, FY2026–FY2027 | Share |
|---|---|---|---|
| 1 | Department of the Army | $80,950,650 | |
| 2 | Department of the Navy | $42,948,672 | |
| 3 | International Boundary and Water Commission U.S.-Mexico | $31,061,344 | |
| 4 | Air Force | $21,023,994 | |
| 5 | Department of Justice | $17,375,983 | |
| 6 | Department of the Interior | $4,644,422 | |
| 7 | Department of Agriculture | $2,297,321 | |
| 8 | Department of Veterans Affairs | $1,147,903 | |
| 9 | Department of Transportation | $1,072,113 | |
| 10 | Department of State | $546,927 |
Top PSC codes by obligations
| Rank | PSC code | Obligated, FY2026–FY2027 | Share |
|---|---|---|---|
| 1 | S119 Other Utilities | $72,931,169 | |
| 2 | S114 Water Services | $52,072,731 | |
| 3 | M1ND Operation of Sewage and Waste Facilities | $18,834,487 | |
| 4 | M1PD Operation of Waste Treatment and Storage Facilities | $17,188,742 | |
| 5 | Z1PZ Maintenance of Other Non-Building Facilities | $14,110,472 | |
| 6 | S222 Waste Treatment and Storage | $8,002,974 | |
| 7 | Z2AZ Repair or Alteration of Other Administrative Facilities and Service Buildings | $4,494,085 | |
| 8 | Z2PZ Repair or Alteration of Other Non-Building Facilities | $3,890,075 | |
| 9 | Z1ND Maintenance of Sewage and Waste Facilities | $2,745,347 | |
| 10 | N046 Installation of Equipment: Water Purification and Sewage Treatment Equipment | $2,163,468 |
Contract obligations by state
| Rank | Place of performance | Obligated, last 12 months | Share |
|---|---|---|---|
| 1 | California | $33,952,865 | |
| 2 | Hawaii | $24,476,667 | |
| 3 | Maryland | $14,526,799 | |
| 4 | Virginia | $12,252,496 | |
| 5 | Florida | $9,928,080 | |
| 6 | North Carolina | $9,410,942 | |
| 7 | New York | $8,883,473 | |
| 8 | Kentucky | $6,533,841 | |
| 9 | Texas | $4,971,427 | |
| 10 | Louisiana | $4,544,034 | |
| 11 | Alaska | $3,443,085 | |
| 12 | Georgia | $3,045,426 | |
| 13 | Pennsylvania | $2,178,649 | |
| 14 | New Jersey | $2,173,961 | |
| 15 | Montana | $1,746,922 | |
| 16 | Oregon | $1,350,028 | |
| 17 | Illinois | $1,218,374 | |
| 18 | Kansas | $1,130,712 | |
| 19 | Arizona | $1,050,140 | |
| 20 | New Mexico | $1,024,233 | |
| 21 | Washington | $758,555 | |
| 22 | Colorado | $590,888 | |
| 23 | New Hampshire | $489,299 | |
| 24 | South Carolina | $469,944 | |
| 25 | Idaho | $342,555 | |
| 26 | Tennessee | $209,879 | |
| 27 | Oklahoma | $201,517 | |
| 28 | Indiana | $161,545 | |
| 29 | Mississippi | $142,350 | |
| 30 | District of Columbia | $117,166 | |
| 31 | Minnesota | $93,918 | |
| 32 | West Virginia | $56,636 | |
| 33 | Nevada | $52,800 | |
| 34 | Arkansas | $42,647 | |
| 35 | Utah | $33,600 | |
| 36 | Puerto Rico | $33,480 | |
| 37 | Massachusetts | $32,963 | |
| 38 | Alabama | $28,006 | |
| 39 | Wyoming | $18,528 | |
| 40 | Ohio | $11,093 | |
| 41 | Wisconsin | $8,962 |
Show all 41
Shares are of everything obligated under NAICS 221320 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 1,179 listed here. See the rest on GovTribe.
Size standard history
Federal Register rules that named this code
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 221320?
NAICS 221320 is Sewage Treatment Facilities, a national industry in NAICS 22, Utilities.
What is the NAICS code for sewer systems?
The NAICS code for sewer systems is 221320, Sewage Treatment Facilities.
What is the NAICS code for sewage disposal plants?
The NAICS code for sewage disposal plants is 221320, Sewage Treatment Facilities.
What is the NAICS code for waste collection, treatment, and disposal through a sewer system?
The NAICS code for waste collection, treatment, and disposal through a sewer system is 221320, Sewage Treatment Facilities.
When did the size standard for NAICS 221320 last change?
The most recent Federal Register rule on record that names NAICS 221320 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 221320?
Federal contracts under NAICS 221320 obligated $237,935,687 in fiscal year 2025 and $852,034,325 in fiscal years 2023 through 2027.
Who are the largest contractors under NAICS 221320?
The contractors with the most obligated under NAICS 221320 in fiscal years 2026 and 2027 are Veolia Water West Operating Services Inc. ($30,992,730), Aqua Engineers Inc. ($24,466,817) and Foreign Utility Consolidated Reporting ($21,281,642).
Which agencies buy the most under NAICS 221320?
The agencies that obligated the most under NAICS 221320 in fiscal years 2026 and 2027 are Department of the Army ($80,950,650), Department of the Navy ($42,948,672) and International Boundary and Water Commission U.S.-Mexico ($31,061,344).
Which PSC codes are used with NAICS 221320?
The PSC codes with the most obligated under NAICS 221320 in fiscal years 2026 and 2027 are S119 Other Utilities, S114 Water Services and M1ND Operation of Sewage and Waste Facilities.
Where is the work under NAICS 221320 performed?
By place of performance, the states with the most contract obligations under NAICS 221320 over the last 12 months are California ($33,952,865), Hawaii ($24,476,667) and Maryland ($14,526,799).
What is the latest contract opportunity under NAICS 221320?
The latest contract opportunity under NAICS 221320 is Redstone Arsenal, Alabama – Utility Services Contract Wastewater Utility System 12 Month Extension, limited / sole source justification from Energy (DLA), posted November 5, 2026.
On GovTribe
See everything under NAICS 221320
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