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EPA's Facility Registry Service identifies and geospatially locates wastewater treatment plants linked to the National Pollutant Discharge Elimination System. This dataset is a subset of FRS integrated facilities, created by the U.S. Environmental Protection Agency. The data is restricted to internal EPA use and was last updated in April 2026.
Data is classified as Mission Sensitive and Critical Infrastructure, restricted to internal EPA use only; the download file and map service are accessible only on the EPA intranet.