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NPDES Permit for Riverside Water and Sewer District Water Treatment Plant in Idaho

Below is EPA's National Pollutant Discharge Elimination System (NPDES) permit for the Riverside Water and Sewer District Water Treatment Plant located on the Nez Perce Reservation in Orofino, Idaho.

Permit number: ID0021237
Effective date: January 1, 2026
Permit expires: December 31, 2030

NPDES Permit, Riverside Water and Sewer District Water Treatment Plant, Nez Perce Reservation, #ID0021237 (pdf) (457.9 KB, November 14, 2025)
Final discharge permit.
NPDES Permit Fact Sheet, Riverside Water and Sewer District Water Treatment Plant, Nez Perce Reservation, #ID0021237 (pdf) (956.89 KB, September 2025)
Technical basis for September 2025 draft permit.