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Managing stormwater in King County
Resources for environmental managers and annual reporting for King County's Phase I Municipal Stormwater National Pollutant Discharge Elimination System (NPDES) Permit.
Share feedback about stormwater plans
Review and comment on our plans for managing stormwater in King County with this public survey. This includes stormwater regulatory updates, facility design guidelines, pollution prevention practices, and annual reports:
- Title 9 updates to meet regulatory requirements.
- Surface Water Design Manual, which describes the technical requirements for stormwater facilities.
- The 2021 Stormwater Pollution Prevention Manual updates, which describe best practices to manage stormwater on commercial, multi-family, and residential properties.
- Stormwater Management Plan (SWMP) which outlines what actions were done in the previous year to manage stormwater.
- Stormwater Management Action Plan (SMAP) which lays out what actions we plan for the coming year to manage stormwater.
Stormwater Management Program (SWMP) plan
Our proposed permit actions for the current calendar year.
NPDES annual report
Actions we take each year to comply with our Phase I Municipal Stormwater NPDES Permit.
Stormwater Management Action Pan
Information about the Stormwater Management Action Plan (SMAP).
Site management plan
Site management plan (the SiMPla) for County-owned properties.
Stormwater videos
About stormwater in King County.