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.
Find NPDES Permits in Region 10
Alaska
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
Idaho
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-issued permits in Idaho
- For state-issued permits, visit Idaho Pollutant Discharge Elimination System ProgramExit
Oregon
EPA issues all NPDES permits on tribal lands in Oregon. The Oregon Department of Environmental Quality (ODEQ) issues all other permits.
- EPA-issued permits in Oregon
- For state-issued permits, visit ODEQ Water Quality Permits Exit
Washington
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-issued permits in Washington
- For state-issued permits, visit Ecology Water Quality Permits Exit
Tribal lands
EPA issues all NPDES permits on tribal lands. See links above for EPA-issued permits within each state.
Regional Permitting Guidance
- 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