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Washington NPDES Permits

In Washington, EPA issues NPDES permits for federally-owned facilities and permits on tribal lands (see table below). EPA has delegated authority to issue other NPDES permits to the Washington Department of Ecology.

For state-issued permits, visit Washington Dept. of Ecology Water Quality Permits Exit

Related pages:

Click on the facility/permit name to view the permit and supporting documents.

NPDES Permits Issued by EPA in Washington
Location Facility or Permit Name Permit Number Permit Status Effective Date Expiration Date
Offshore Coastal Waters General Permit for Offshore Seafood Processors in Federal Waters Off the Coast of Washington and Oregon WAG520000 Final 2019-05-01 2024-04-30
Coulee Dam Town of Coulee Dam Wastewater Treatment Plant WA0020281 Final 2017-12-01 2022-11-30
Fort Lewis Joint Base Lewis-McChord (JBLM) MS4 (Stormwater) WAS026638 Final 2013-12-25 2018-09-30
Federal and Tribal Lands in Washington General Permit for Federal Aquaculture Facilities and Aquaculture Facilities in Indian Country in Washington (Washington Fish Hatcheries) WAG130000 Final 2016-08-01 2021-07-31
Mt. Rainier National Park Paradise Wastewater Treatment Plant WA0025569 Final 2017-02-01 2022-01-31
Leavenworth Leavenworth National Fish Hatchery WA0001902 Final 2018-01-01 2022-12-31
Grand Coulee Dam Grand Coulee Dam Wastewater Treatment Plant WA0024163 Final 2014-08-01 2019-07-31
Harrah (Yakama Reservation) Town of Harrah Wastewater Treatment Plant WA0022705 Final 2012-10-01 2017-09-30
Fort Lewis Joint Base Lewis-McChord (JBLM) Solo Point Wastewater Treatment Plant WA0021954 Final 2012-04-01 2017-04-01
Suquamish (Port Madison Reservation) Suquamish Wastewater Treatment Plant (Current Permit) WA0023256 Final 2008-06-01 2013-05-31
Suquamish (Port Madison Reservation) Suquamish Wastewater Treatment Plant (Proposed Reissuance) WA0023256 Draft N/A N/A
Bellingham (Lummi Reservation) Lummi Sandy Point Wastewater Treatment Plant WA0025658 Final 2011-12-01 2016-11-30
Bellingham (Lummi Reservation) Lummi Gooseberry Point Wastewater Treatment Plant WA0025666 Final 2011-12-01 2016-11-30
Bellingham (Lummi Reservation) Lummi Kwina Road Membrane Bioreactor (MBR) Wastewater Treatment Plant WA0026727 Final 2015-08-01 2020-07-31
Neah Bay (Makah Reservation) Makah Wastewater Treatment Plant WA0023213 Final 2016-07-01 2021-06-30
Oak Harbor Naval Air Station Whidbey Island Ault Field Wastewater Treatment Plant WA0003468 Final 2011-03-01 2016-02-28
Oak Harbor Naval Air Station Whidbey Island MS4 (Stormwater) WAS026611 Final 2021-02-01 2026-01-31
Richland Pacific Northwest National Laboratory (PNNL) - Tracer Injection Project WA0026859 Final 2018-06-01 2023-05-31
Rufus Woods Lake (Colville Reservation) Net Pen Aquaculture Facilities Discharging to Rufus Woods Lake (Pacific Aquaculture Sites #1-3, and Faith Frontier Ministries Chief Joseph Fish Farm) WA0026336;
WA0026328;
WA0026719;
WA0026379
Final 2020-05-01 2025-04-30
Bremerton Puget Sound Naval Shipyard  WA0002062 Final 1994-04-01 1999-04-01
Puyallup (Puyallup Reservation) Puyallup Wastewater Treatment Plant WA0037168 Final 2014-12-01 2019-11-30
Queets(Quinault Reservation) Queets Village Wastewater Treatment Plant WA0023442 Final 2014-10-01 2019-09-30
Moclips (Quinault Reservation) Moclips River Estates Wastewater Treatment Plant WA0026603 Final 2017-12-01 2022-11-30
Anacortes (Swinomish Reservation) Swinomish North End Wastewater Treatment Plant WA0025062 Final 2012-07-01 2017-06-30
Anacortes (Swinomish Reservation) Swinomish Shelter Bay Wastewater Treatment Plant WA0024422 Final 2012-07-01 2017-06-30
Taholah (Quinault Reservation) Tahola Village Wastewater Treatment Plant (Current Permit) WA0023434 Final 2015-07-01 2020-06-30
Taholah (Quinault Reservation) Tahola Village Wastewater Treatment Plant (Proposed Reissuance) WA0023434 Draft N/A N/A
Toppenish (Yakama Reservation) Toppenish Wastewater Treatment Plant WA0026123 Final 2013-07-01 2018-06-30
Tulalip Reservation Tulalip Tribes of Washington Wastewater Treatment Plant (Current Permit) WA0024805 Final 2009-11-01 2014-10-31
Tulalip Reservation Tulalip Tribes of Washington Wastewater Treatment Plant (Proposed Reissuance) WA0024805 Draft N/A N/A
Oso Naval Radio Station (Transmitter (T)) Jim Creek WA0026573 Final 2015-06-01 2020-05-30
Bangor Naval Base Bangor WA0025577 Final 2010-09-01 2015-08-31
Wapato (Yakama Reservation) Wapato Wastewater Treatment Plant WA0050229 Final 2011-11-01 2016-10-31
Toppenish (Yakama Reservation) Washington Beef WA0050202 Final 2010-02-01 2015-01-31
Toppenish (Yakama Reservation) Legends Casino Wastewater Treatment Plant WA0026743 Final 2013-11-01 2018-10-31
Wellpinit (Spokane Reservation) Dawn Mining Company Midnite Mine WA0026841 Final 2019-01-01 2023-12-31
Wellpinit (Spokane Reservation) Wellpinit Wastewater Treatment Plant WA0025704 Final 2019-04-01 2024-03-31
Marine Waters General Permit for Tribal Marine Net Pen Enhancement Facilities in Washington WAG132000 Final 2015-11-01 2020-10-31
Puget Sound

General Permit for Tribal Enhancement and Federal Research Marine Net Pen Facilities within Puget Sound (Proposed Permit)

WAG132000 Draft N/A N/A
Oak Harbor Naval Air Station Whidbey Island Seaplane Base Lagoon Wastewater Treatment Plant WA0026760 Final 2018-12-27 2023-12-26
Manchester Naval Fleet Logistics Center Puget Sound WA0002780 Final 2021-02-01 2026-01-31
Everett Naval Station Everett MS4 (Stormwater) WAS026620 Final 2021-02-01 2026-01-31
Bremerton Naval Base Kitsap MS4 (Stormwater) WAS026646 Final 2021-02-01 2026-01-31
Lower Columbia River Federal Hydroelectric Projects in the Lower Columbia River (Bonneville Project, The Dalles Lock and Dam, John Day Project, McNary Lock and Dam) WA0026778;
WA0026701;
WA0026832;
WA0026824
Draft N/A N/A
Lower Snake River Federal Hydroelectric Projects in the Lower Snake River (Ice Harbor Lock and Dam, Lower Monumental Lock and Dam, Little Goose Lock and Dam, Lower Granite Lock and Dam)
WA0026816;
WA0026808;
WA0026786;
WA0026794
Draft N/A N/A
Puyallup Reservation Pierce County MS4 (Stormwater) WAS026875 Draft N/A N/A
Puyallup Reservation City of Tacoma MS4 (Stormwater) WAS026689 Draft N/A N/A
Puyallup Reservation Washington Department of Transportation (WSDOT) MS4 (Stormwater) WAS026743 Draft N/A N/A
Harstine Island (Squaxin Island Reservation) Salish Seafoods WA0037320​ Draft N/A N/A