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The 2021 Stormwater Pollution Prevention Manual (SPPM) provides best management practices (BMP's) for managing stormwater on commercial, multi-family and residential properties. The manual provides detailed information for businesses, residents, managers, and owners of property in unincorporated King County, and describes the actions we are all required to take to reduce the contamination of stormwater, surface water, and groundwater, to comply with Federal Clean Water Act requirements.

Download here:

2021 SPPM - Full Document (1.9 MB)

BMP Activity Sheets for Commercial and Multifamily Residential Activities

BMP Activity Sheets for Residential Activities

Information Sheets with more detailed information on specific pollution prevention practices called out in the BMP Activity Sheets

If you have questions about the Stormwater Pollution Prevention Manual, contact Robert Bernhard, King County Stormwater Services Section.