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Wastewater Treatment

King County, Washington

For questions about the Wastewater Treatment Division website, please send an e-mail message or contact us at:

King Street Center
201 S. Jackson St., Suite 500
Seattle, WA 98104-3855
Phone: 206-477-5371
Fax: 206-684-1741
Telecommunication device for the deaf (TTY): 711

Get Directions to our office location in Seattle, Washington.

Staff Contacts

Barton CSO Control Project

Green stormwater infrastructure

Facility operation 

Completed fall 2015

September 2, 2015

Let us know your thoughts – come to the September 20 celebration and take our post-construction survey.

Thank you to all the West Seattle neighbors who have shared your thoughts, expressed your concerns, and survived construction of the roadside rain gardens in the Sunrise Heights and Westwood neighborhoods. The project team will be in your neighborhood from 1-4 p.m. on Sunday, September 20 to thank you and celebrate with you.

See the invitation for details.

And please take a moment to fill out the post-construction survey (external link). It provides important feedback to help King County improve its service to neighborhoods impacted by construction. The survey closes September 25. Thank you and hope to see (and hear from) you soon.

Barton basin and project location.
2015 construction map
Barton CSO Control Project area

Project description

King County is constructing roadside rain gardens, a type of green stormwater infrastructure, in the Sunrise Heights and Westwood neighborhoods in West Seattle. Located in the planter strip between the curb and sidewalk, these roadside rain gardens will divert stormwater runoff away from the combined sewer system. When it rains, stormwater will filter through the rain garden soil to a drain pipe, which will take the water to a deep well for slow infiltration underground. Keeping stormwater out of the sewer system will reduce CSOs of raw sewage and untreated stormwater into Puget Sound near the Fauntleroy ferry dock. For a summary of improvements, along with information on plant palettes and trees, click here.

Project need

In 2008, King County reported that the Barton Pump Station averages four overflows per year that discharge approximately 4 million gallons of raw sewage and untreated stormwater into Puget Sound near the Fauntleroy ferry dock. King County is working to meet current regulations set by the Washington Department of Ecology that require no more than one untreated discharge per year on a long term average.

What you can expect during construction

  • Work hours Monday through Friday, 7 a.m. to 6 p.m. Advance notice will be provided for any work outside those hours.
  • Construction materials and equipment on the street and material storage in the right-of-way planter strips.
  • Noise and activity typical of a construction area.
  • The contractor will maintain local and emergency access at all times although there will be times when local access will need to be coordinated with the construction crew.
  • Uninterrupted delivery of mail and packages and uninterrupted waste management pick up.
  • All work to occur in the public right-of-way.

Being a good neighbor

King County is committed to being a good neighbor and will work directly with the community throughout construction to reduce impacts whenever possible. If you have questions or concerns, please call the 24-hour construction hotline at 206-205-9184 or email

Project schedule

Project milestones  Dates 
Construct roadside rain gardens on 10 streets March – October 2014
Construct roadside rain gardens on 5 streets March – October 2015
Ongoing facility maintenance October 2014 and beyond
Community outreach and engagement Throughout


RainWise now available for Barton basin residents
RainWise now available for Barton basin residents
. The residential RainWise program provides rebates that cover most or all of the cost of installing cisterns and rain gardens on private property. The program is available to all homeowners in the Barton basin starting now and running through 2015. Learn more.

News releases

Project updates

Find out if a CSO is occurring in Barton

Related information

For more information