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:
- 2022 Stormwater Management Program Plan (207 MB)
- 2021 Stormwater Management Program Plan (1.3 MB)
- 2020 Stormwater Management Program Plan (1.0 MB)
- 2019 Stormwater Management Program Plan (14.7 MB)
- 2018 Stormwater Management Program Plan (14.7 MB)
- 2017 Stormwater Management Program Plan (12.2 MB)
- 2016 Stormwater Management Program Plan (11.3 MB)
- 2015 Stormwater Management Program Plan (14.6 MB)
- 2014 Stormwater Management Program Plan (7.5 MB)
- 2013 Stormwater Management Program Plan (22.1 MB)