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NPDES Permit for Toppenish Wastewater Treatment Plant on the Yakama Reservation

Below is EPA's National Pollutant Discharge Elimination System (NPDES) permit for the City of Toppenish Wastewater Treatment Plant within the Yakama Indian Reservation in Washington.

Permit number: WA0026123
Effective date: January 1, 2026
Permit expires: December 31, 2030

NPDES Permit, City of Toppenish WWTP, #WA0026123 (pdf) (682.17 KB, November 14, 2025)
Final wastewater permit.
NPDES Permit Fact Sheet, City of Toppenish WWTP, #WA0026123 (pdf) (2.61 MB, September 2025)
Technical basis for September 2025 draft permit.

NPDES Permit for Toppenish Wastewater Treatment Plant on the Yakama Reservation

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