About Region 10's NPDES Permit Program
This page contains information about EPA's NPDES permitting program in Region 10, which serves Alaska, Idaho, Oregon, and Washington and 271 federally recognized tribes.
EPA issues the following NPDES permits in Alaska:
- Federally-owned facilities located in Denali National Park.
- Facilities operating outside State waters (three miles offshore).
- Facilities that have been issued Clean Water Act Section 301(h) waivers from secondary treatment standards.
- All permits on tribal lands.
The Alaska Department of Environmental Conservation issues all other permits.
- EPA-issued permits in Alaska
- For state-issued permits, visit Alaska Pollutant Discharge Elimination System (APDES) Program Exit
EPA has approved Idaho’s application to administer the Idaho Pollutant Discharge Elimination System (IPDES) program. Authority for permitting discharges within Idaho's jurisdiction will transfer from EPA to Idaho in four phases through July 2021. Visit Idaho NPDES Program Authorization for more information.
EPA will continue to issue all permits on tribal lands in Idaho.
EPA issues all NPDES permits on tribal lands in Oregon. The Oregon Department of Environmental Quality (ODEQ) issues all other permits.
EPA issues NPDES permits for federally-owned facilities and all permits on tribal lands in Washington. The Washington Department of Ecology (Ecology) issues all other permits.
EPA issues all NPDES permits on tribal lands. See links above for EPA-issued permits within each state.
- Guidance on Major/Minor Designation for NPDES Facilities in Region 10
- Water Sampling and Testing for Formaldehyde at Northwest Fish Hatcheries
- Advanced Wastewater Treatment to Achieve Low Concentration of Phosphorus (PDF)(73 pp, 4.4 MB, About PDF)
- Guidance on Water Quality Based Effluent Limits Set Below Analytical Detection/Quantitation Limits