# NAICS 221320: Sewage Treatment Facilities

Breadcrumb: [NAICS codes](https://bidrover.com/naics) › [221320 Sewage Treatment Facilities](https://bidrover.com/naics/221320)

This industry comprises establishments primarily engaged in operating sewer systems or sewage treatment facilities that collect, treat, and dispose of waste.

- NAICS code: 221320
- Title: Sewage Treatment Facilities
- Sector: 22 Utilities
- Subsector: 221 Utilities
- Industry group: 2213 Water, Sewage and Other Systems
- SBA size standard: $35 million average annual receipts
- Open bids on BidRover: 1
- Updated: Oct 23, 2026

## Open bids (1)

- [Sioux City Wastewater Treatment Plant Facility Plan - Phase 1 Improvements Project](https://bidrover.com/bids/sioux-city-wastewater-treatment-plant-facility-plan-phase-1-improvements-project--b57fa5c8-c8c6-4828-a023-1dc922e087e3) — Construction & facilities · Iowa, United States · due 2026-10-28

## Frequently asked questions

### What is NAICS code 221320?

NAICS 221320 is "Sewage Treatment Facilities" in the 2022 North American Industry Classification System, in sector 22 (Utilities). This industry comprises establishments primarily engaged in operating sewer systems or sewage treatment facilities that collect, treat, and dispose of waste.

### What is the SBA size standard for NAICS 221320?

A business is small under NAICS 221320 at or below $35 million average annual receipts, including affiliates (13 CFR 121.201). Confirm the standard named in each solicitation.

### How many government bids are open under NAICS 221320?

BidRover counts 1 open bid that cite NAICS 221320 as of Oct 23, 2026, refreshed every hour from official public sources. Many state and local notices do not list a NAICS code, so search by keyword too.

### How do I get alerts for NAICS 221320 bids?

Save an alert on this page. A free account gets new matching bids by weekly email; the Team plan ($19/mo) sends daily alerts with match scores, the buyer, source link and documents.

## Related NAICS codes

- [221310 Water Supply and Irrigation Systems](https://bidrover.com/naics/221310)
- [562991 Septic Tank and Related Services](https://bidrover.com/naics/562991)
- [562998 All Other Miscellaneous Waste Management Services](https://bidrover.com/naics/562998)
- [221330 Steam and Air-Conditioning Supply](https://bidrover.com/naics/221330)

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Code titles and definitions: U.S. Census Bureau, North American Industry Classification System (NAICS), 2022 (https://www.census.gov/naics/). Size standards: U.S. Small Business Administration, Small Business Size Standards, 13 CFR 121.201, eCFR text current as of 2026-10-21 (https://www.ecfr.gov/current/title-13/section-121.201).

BidRover lists bids from official public sources. It is not an issuing authority; confirm the NAICS code and size standard named in each solicitation.