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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

Project Construction

February 2015 Update --
2015 construction season to begin first week of March. Road side rain gardens to be constructed on five blocks.

View project update (PDF, February 10, 2015). 

Fall 2014 newsletter
Learn about work completed in 2014 and winter maintenance activities, and see images of the new roadside rain gardens in the fall 2014 Barton CSO newsletter.

If you have any questions or concerns, do not hesitate to call the 24-hour construction hotline or email

24-hour construction hotline: 206-205-9184
The construction hotline will stay active this winter. Please use it if you see problems with the roadside rain gardens such as standing water longer than 24 hours after a storm, vandalism, or excessive weeds. Once construction is complete in 2015, there will be a long-term maintenance hotline for neighbors and community members to report problems.

Barton basin and project location.
Planned construction sequence in 2014
Barton CSO Control Project area

Project description

King County will construct bioretention swales (roadside rain gardens), a type of green stormwater infrastructure, in the City of Seattle’s planting strips in the Sunrise Heights and Westwood neighborhoods. Street runoff will be diverted away from storm drains and into the vegetated swales. Once in the swales, the water will filter through soil to an underdrain, which will take the water to a deep well for slow infiltration underground.

Summary of plantings and street improvements.
View here (PDF, 18MB), a summary of improvements, along with information on plant palettes and trees.

Project need

In 2008, King County reported that the Barton Pump Station averages 4 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. Taking stormwater out of the conveyance system in Sunrise Heights and Westwood will reduce these combined sewer overflows (CSOs).

What you can expect during construction

  • Roadside rain gardens constructed in two seasons – March to October 2014 and March to October 2015
  • Each block will take approximately two months to complete
  • Work hours in compliance with City of Seattle permits, which typically allow work between 7 am and 6 pm Monday to Friday
  • Local access at all times for homeowners and emergency vehicles
  • Pedestrian access at all times
  • Restricted parking while street is in construction

Being a good neighbor

King County is committed to being a good neighbor and will work directly with the community throughout construction to minimize impacts whenever possible.  Residents can expect:

  • Advance notice of construction activities and expected impacts via mail, email, phone and project fliers
  • One-on-one problem solving with residents directly impacted by construction activities
  • Weekly project website and construction updates
  • 24 hour construction hotline. Response from live person within one business day of call. 

Project schedule

Barton CSO Control Project schedule and milestones 

Download project schedule (PDF, updated June 2013).

Working with the community
Kristine Cramer (King County Community Relations) was a guest teacher for second grade classes at Westside School in May 2014. Her lessons helped connect students' salmon studies to roadside rain gardens, with a focus on reducing water pollution in Puget Sound.

Kristine Cramer (King County Community Relations) was a guest teacher for second grade classes at Westside School in May. 

News releases

Project updates

Find out if a CSO is occurring in Barton

Related information

For more information

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.