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King County Stormwater Management Program Plan

Our Stormwater Management Program (SWMP) Plan lists our proposed actions to comply with the Phase I Municipal Stormwater National Pollutant Discharge Elimination System (NPDES) Permit (Phase I Permit) issued by the Washington State Department of Ecology.

The SWMP is also attached to our Annual Report, which provides information for our previous year's work related to the Phase I Permit. 

Please let us know your feedback to help shape the SWMP Plan. Comments submitted after March 31 will be considered for next year's program plan.

Download current document here:

2023 Final Stormwater Management Program Plan (4.6 MB)

Previous SWMP plans: