Skip to main content
King County logo

Our Phase I Municipal Stormwater National Pollutant Discharge Elimination System (NPDES) Permit (Phase I permit) requires us to submit an Annual Report to the Washington State Department of Ecology (Ecology). The Annual Report is submitted on or before March 31st and provides information for our previous year’s work.

The Stormwater Management Plan (SWMP), also attached to the Annual Report, provides our plan for complying with the Phase I permit for the year to come. The latest version of the SWMP is posted here.

We invite you to participate in the decision-making processes involving the development, implementation, and update of our SWMP. If you have any questions or feedback about our Annual Report or SWMP, please email us at stormwater@kingcounty.gov

Annual Reports