Permitting Division: King County Department of Local Services (DLS)
Stormwater Pollution Prevention Manual
The Stormwater Pollution Prevention Manual describes required best management practices for businesses, residents, managers, and owners of property in unincorporated King County to apply to reduce the contamination of stormwater, surface water, and groundwater.
Stormwater drainage facility maintenance
Guide for property owners, developers, engineers, or field crews overseeing, specifying, or conducting the maintenance on commercial and multifamily drainage facilities.
Improving ditch maintenance for water quality
Wetlands knowledge, regulations, compliance, and resources
- King County Wetlands
- Changes to Wetland Regulations (May 2020) (331 KB)
- Wetlands Mitigation Reserves Program
King County Code related to the SWDM