Find comprehensive services, data and information related to stormwater and non-point source pollution in King County, Washington.

To offer a suggestion or report an error on the King County stormwater services and information website, please contact Fred Bentler, webmaster.
Stormwater Services and Information for King County, Washington

Archived documents
Previous versions of stormwater code documents and manuals

This page contains links to outdated Stormwater documents archived for future reference for cases where they're referenced in municipal codes.

Draft 2009 Surface Water Design Manual and the Stormwater Pollution Prevention Manual.

Older versions of the Surface Water Design Manual (SWDM)

2005 Stormwater Pollution Prevention Manual
Also known as the BMP manual , this document provides guidance for businesses, public facilities, and other non-residential entities in unincorporated King County on actions we are all required to take to reduce contamination of stormwater, surface water, and groundwater.

For questions about the Stormwater Web Site, please contact Dale Nelson,Engineer II, King County Stormwater Services Section.

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