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A geospatial dataset from the EPA's Facility Registry Service identifies and locates Waste Water Treatment Plant facilities linked to the National Pollutant Discharge Elimination System. It contains facility identification and location information for plants subject to NPDES surface water discharge permits under the Clean Water Act. The U.S. Environmental Protection Agency maintains the data, which was last updated in April 2026.
Data is classified as Mission Sensitive and Critical Infrastructure; download and access are restricted to the EPA intranet.