EPA · discharge permits by watershed

Discharge permits by subbasin

• 1,923Subbasins
• 22Watershed regions

Every subbasin in the national Watershed Boundary Dataset carrying at least 3 current Clean Water Act discharge permits, grouped by the region its code begins with. Each subbasin page lists the permits whose outfall EPA places in it, and the watersheds inside it; each of those names the subwatersheds inside it in turn. The same set, one region to a page, is on subbasins by watershed region.