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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

Proposed Update
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) for the purposes of public review, consists of the following draft chapters and appendices.  The Summary of Changes document provides a chapter by chapter guide to the most significant revisions. The proposed public rule is also provided below.

2016 Stormwater Pollution Prevention Manual Draft Documents

SPPM Summary of Changes (155 KB)

SPPM including appendices (1,623 KB)

SPPM Proposed Public Rule PUT 8-8-3 (102 KB)

Written comments on these proposed changes are due by COB on January 18, 2016.  Email written comments to Cynthia Hickey of King County Water and Land Resources Division, Stormwater Services Section at  Oral comments may be provided in person between the hours of 8:30 am to 4:30 pm from Monday, December 14th through Friday, December 18, 2015 at the Water and Land Resources Division offices on the 6th floor of the King Street Center, 201 South Jackson Street, in Seattle.

 If you have questions about the proposed changes, 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.