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NPDES permit for Kamiah Water Treatment Plant in Idaho

Below is EPA's National Pollutant Discharge Elimination System (NPDES) permit for the Kamiah Water Treatment Plant on the Nez Perce Reservation in Idaho.

Permit number: ID0028461
Effective date: May 1, 2026
Permit expires: April 30, 2031

NPDES Permit, Kamiah Water Treatment Plant, Idaho, #ID0028461 (pdf) (602.43 KB, March 12, 2026)
Final discharge permit.
NPDES Permit Fact Sheet, Kamiah Water Treatment Plant, Idaho, #ID0028461 (pdf) (1.19 MB, January 2026)
Technical basis for draft permit.
Response to Comments on Draft NPDES Permit for Kamiah Water Treatment Plant, Idaho, #ID0028461 (pdf) (217.76 KB, February 2026)
EPA's responses to comments received on the January 2026 draft permit.

Related permit: NPDES Permit for Kamiah Wastewater Treatment Plant