NAICS UNIVERSITY · Free research for insurance agents
Sewage Treatment Facilities
NAICS 221320 · United States · 2022 edition
This industry comprises establishments primarily engaged in operating sewer systems or sewage treatment facilities that collect, treat, and dispose of waste.
Activities described by this code
Other activities to examine
- Operating waste treatment or disposal facilities (except sewer systems or sewage treatment facilities): 56221 — Waste Treatment and Disposal
- Operating water treatment plants and/or operating water supply systems: 221310 — Water Supply and Irrigation Systems
- Pumping (i.e., cleaning) cesspools, portable toilets, and septic tanks or renting portable toilets: 562991 — Septic Tank and Related Services;
- Cleaning and rodding sewers and catch basins: 562998 — All Other Miscellaneous Waste Management Services
Census classification reference
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Compare another operationInsurance operations research — draft
Sewage treatment facilities collect raw sewage from municipal or industrial sources through sewer system infrastructure, process it through screening, settling, biological treatment, and disinfection stages, and discharge treated effluent in compliance with regulatory permits. Operations typically involve continuous mechanical and chemical processes, large pump and blower systems, and management of biosolids for disposal or beneficial reuse.
Questions to investigate
- Is the facility municipally owned and operated, privately operated under contract, or a private utility?
- What is the permitted treatment capacity, and is the facility currently operating near that capacity?
- Are there any active consent orders, notices of violation, or regulatory enforcement actions?
- Does the facility handle industrial pretreatment streams in addition to municipal sewage?
This insurance research was generated in April 2026. It has not received a complete human review. The October 12, 2026 audit checked codes and titles only, not descriptions or coverage assertions.