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The 2017 Stormwater Management Program (SWMP) Plan outlines King County's proposed actions to comply with the 2013-2018 National Pollutant Discharge Elimination System (NPDES) Phase I Municipal Stormwater Permit (external link) issued by the Washington State Department of Ecology.

The 2017 Stormwater Management Program Plan is offered in Adobe Acrobat format. For help using Acrobat, please visit our Acrobat help page.

Download current document here:

Please let us know your feedback to help shape the planWe will include responses received by March 31 in this year’s review. Comments submitted after the deadline will be included in next year’s program.

Previous SWMP Plans:

For questions about the King County Stormwater Management Program, please contact us at