EPA National Sewershed Dataset (Sewersheds of the United States)
U.S. Environmental Protection Agency, Clean Watersheds Needs Survey (CWNS)
- License
- Attribution
- Commercial
- Yes
- Format
- Several
- Coverage
- United States
- Last updated
- Added to findgis 31 Oct 2026 · Update frequency Irregular
Version 1.3 holds about 17,000 sewershed polygons and their treatment plant endpoints, mixing utility-supplied and EPA-modeled boundaries. Not authoritative for single-property connections.
CartaTerra can export this layer as GeoPackage, Shapefile, GeoJSON, KML, CSV, or GPX.
Source and attribution
- Publisher
- U.S. Environmental Protection Agency, Clean Watersheds Needs Survey (CWNS)
- License
- Attribution
- Commercial use
- Yes
- Attribution required
- Yes
- Modification allowed
- See publisher
- Redistribution allowed
- See publisher
- Share-alike
- No
- Region
- United StatesUS
- Type
- Vector
- Extent
- -179.217.6-64.571.4West, south, east, north. Approximate region extent.
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