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National Pollutant Discharge Elimination System (NPDES) Permit

Pollutants picked up by stormwater are a significant source of water quality problems in our streams and the Puget Sound.  The National Pollutant Discharge Elimination System (NPDES) is a program created under the Federal Clean Water Act.  In Washington State, authority over the program is given to Washington State Department of Ecology (DOE). The intent of the NPDES Program is to protect and restore water quality in waters of the State to support beneficial uses, such as fishing and swimming. Some governmental and private entities must obtain an NPDES Permit, and comply with conditions set forth in the Permit, before discharging stormwater or wastewater to waters regulated by Federal and State governments.  The NPDES Phase II Municipal Stormwater Permit for Western Washington initially went into effect in February 2007, and has been renewed through July 31, 2024.  The City of Mukilteo is a Permittee under this Permit.

The NPDES Phase II Municipal Stormwater Permit can be viewed at DOE’s webpage.

Annual Stormwater Management Program (SWMP) Plan

One of the NPDES Permit requirements is for the City to create an Annual Stormwater Management Program (SWMP) Plan.  The purpose of the SWMP Plan is to outline the City’s planned stormwater program activities for the upcoming year, as they relate to the NPDES Permit.  The SWMP Plan differs from the Comprehensive Surface Water Management Plan in two important ways: 1) the Comprehensive SWMP looks many years into the future; the Annual SWMP Plan covers one year at a time, and 2) the Comprehensive SWMP encompasses all activities of the Utility; the Annual SWMP Plan only covers those activities meant to meet NPDES Permit requirements.

2023 Stormwater Management Program Plan

2022 Stormwater Management Program Plan

2021 Stormwater Management Program Plan

 2020 Stormwater Management Program Plan

2019 Stormwater Management Program Plan

2018 Stormwater Management Program Plan 


Annual Reports

The NPDES Permit requires that the City submit an Annual Report in March of every year summarizing the activities conducted to meet NPDES Permit requirements.  Previous reports and supporting documents can be requested by contacting the City.

2022 Annual Report

2021 Annual Report

2020 Annual Report

2019 Annual Report

2018 Annual Report

For additional information contact:

Meiring Borcherds, Surface Water Programs Manager
425-263-8083 or

File: http://mukilteowa.gov/wp-content/uploads/FINAL-2023-Stormwater-Management-Program-Plan.pdf
Link: https://mukilteowa.gov/final-2023-stormwater-management-program-plan/
File: http://mukilteowa.gov/wp-content/uploads/2022-Stormwater-Management-Program-Plan.pdf
Link: https://mukilteowa.gov/departments/public-works/surface-water/stewardship/npdes/2022-stormwater-management-program-plan/
File: http://mukilteowa.gov/wp-content/uploads/FINAL-2021-Stormwater-Management-Program-Plan.pdf
Link: https://mukilteowa.gov/departments/public-works/surface-water/stewardship/npdes/final-2021-stormwater-management-program-plan/
File: http://mukilteowa.gov/wp-content/uploads/FINAL-2019-Surface-Water-Management-Program-Plan.pdf
Link: https://mukilteowa.gov/departments/public-works/surface-water/stewardship/npdes/final-2019-surface-water-management-program-plan/
File: http://mukilteowa.gov/wp-content/uploads/2022-Annual-Report.pdf
Link: https://mukilteowa.gov/2022-annual-report/
File: http://mukilteowa.gov/wp-content/uploads/2021-Annual-Report.pdf
Link: https://mukilteowa.gov/departments/public-works/surface-water/stewardship/npdes/2018-stormwater-management-program-plan-comment-form/2021-annual-report/
File: http://mukilteowa.gov/wp-content/uploads/2020-Annual-Report-1.pdf
Link: https://mukilteowa.gov/departments/public-works/surface-water/stewardship/npdes/2020-annual-report-2/
File: http://mukilteowa.gov/wp-content/uploads/2018-Submitted-Annual-Report.pdf
Link: https://mukilteowa.gov/departments/public-works/surface-water/stewardship/npdes/2018-submitted-annual-report/

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