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NPDES Permit for Yellowstone National Park Pesticide Program in Wyoming

Under National Pollutant Discharge Elimination System permit number WY-0000005, Yellowstone National Park will be authorized to discharge from its pesticide treatment program located in Yellowstone National Park (a Land of Exclusive Federal Jurisdiction) in Wyoming, to Buffalo Creek, Tower Creek, and Carnelian Creek.

WY-0000005 Yellowstone National Park Service Pesticide Application Permit (pdf) (888.83 KB, August 6, 2025)
The NPDES discharge permit.
WY-0000005 Yellowstone National Park Service Pesticide Application Statement of Basis (pdf) (1.57 MB, August 6, 2025)
The statement of basis for the NPDES discharge permit.