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Stormwater services

Managing stormwater and waterborne pollution

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

Stormwater Pollution Prevention Manual

The King County Department of Natural Resources and Parks is declaring its intent to adopt an update to the 2009 Stormwater Pollution Prevention Manual by public rule in accordance with King County Code Chapter 2.98 Rules of County Agencies.

The 2016 Stormwater Pollution Prevention Manual (SPPM) consists of the following chapters and appendices.  The Summary of Changes document provides a chapter by chapter guide to the most significant changes made to the 2016 version. The public rule is also provided below.

2016 Stormwater Pollution Prevention Manual Documents

SPPM Summary of Changes (155 KB)

SPPM including appendices (1,623 KB)

SPPM Public Rule PUT 8-8-3 (102 KB)


 If you have questions about the Stormwater Pollution Prevention Manual, contact Cynthia Hickey at

2009 King County Stormwater Pollution Prevention Manual

2009 Stormwater Pollution Prevention ManualThe 2009 King County Stormwater Pollution Prevention Manual 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.

Pursuant to King County Code 9.12, Ordinance 16264, the County adopted rules outlined in the Stormwater Pollution Prevention Manual (SPPM). The purpose of this rule is to update the 2005 Stormwater Pollution Prevention Manual to conform to the requirements of King County’s Municipal Stormwater NPDES Permit. This update was adopted on January 9, 2009.

The Stormwater Pollution Prevention Manual is available for download in Adobe Acrobat PDF format.

Download here:

Written public comment on this proposed Public Rule and determination of non-significance was accepted until November 29, 2008.

For questions about the stormwater services website, please contact Dale Nelson, Engineer, King County Stormwater Services Section.