EPA · discharge permits by watershed

Subbasins by watershed region

22Regions
1,923Subbasins

The national Watershed Boundary Dataset numbers every subbasin with a code whose first two digits are the region it drains into. Each region below opens its own list, and each subbasin on it opens the page naming the permits whose outfall EPA places there and the watersheds inside it. The whole set is also on every subbasin, by region.

Region 0151
Region 0285
Region 03203
Region 04112
Region 05120
Region 0632
Region 07131
Region 0879
Region 0943
Region 10286
Region 11167
Region 12118
Region 1352
Region 1458
Region 1567
Region 1633
Region 17180
Region 1879
Region 1911
Region 206
Region 217
Region 223

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