World wastewater treatment plant observatory · data as reported by each inventory
Wastewater treatment plants in the United States
14,626 inventory records · HydroWASTE v1.0 / United States
Data years: 2008, 2012. The inventory date does not establish current operation.
States
14,626 results
Regulatory context
General reference. This is not an exhaustive review of applicable law.
United States: Clean Water Act / NPDES
NPDES regulates pollutant discharges from point sources to waters of the United States. The permit sets limits and monitoring conditions. A CWNS code identifies an inventory record, not an NPDES permit.
- Permit identifier and permitting authority: EPA or an authorized state.
- Outfall and receiving water; sewer connections follow a different control route.
- Current permit conditions, limits and dated measurements; these are not included in CWNS.
References reviewed: 2026-11-06. Individual applicability: undetermined. This profile does not establish authorization or compliance.