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Draft NPDES Permit for Chief Joseph Dam in Washington

Below is EPA's National Pollutant Discharge Elimination System (NPDES) draft permit and supporting documents for the U.S. Army Corps of Engineers Chief Joseph Dam discharging to the Columbia River in Washington and to the Columbia River in Colville tribal waters.

EPA accepted public comments on this draft permit from January 13 through March 30, 2022 (extended from February 28).

Permit number: WA0026891

Draft NPDES Permit, Chief Joseph Dam, #WA0026891 (pdf) (January 2022)
Proposed discharge permit.
NPDES Permit Fact Sheet, Chief Joseph Dam, #WA0026891 (pdf) (January 2022)
Technical basis for permit.