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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

Facility operation 

Completed fall 2015

King County is responsible for regular maintenance of the roadside rain gardens year round. You can expect to see crews onsite at least monthly performing regular maintenance. Expect more frequent visits before and after large storms, and during the summer growing season.

>> Learn more by visiting the OPERATIONS PAGE for the Barton CSO Control Facility (roadside rain gardens).

Project description

King County constructed 91 roadside rain gardens, a type of green stormwater infrastructure, on 15 blocks in the Sunrise Heights and Westwood neighborhoods in West Seattle. Located in the planter strip between the curb and sidewalk, these roadside rain gardens divert stormwater runoff away from the combined sewer system. When it rains, stormwater filters through the rain garden soil to a drain pipe, which takes 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 recently upgraded Barton Pump Station and Fauntleroy ferry dock.

Summer 2015 newsletter
Learn more: view the summer 2015 project newsletter.

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



Source: summer 2015 newsletter (PDF).

King County has installed curb markers on every block with information on how to contact the County with questions or concerns about the rain gardens. Please call 206-263-3801 if you see:

  • Ponding water that lasts longer than 24 hours after it has stopped raining
  • Vandalism
  • Spills or contamination
  • Other major concerns

24-hour maintenance hotline, 206-263-3801

If you see a piece of trash, pick it up. Thank you for your ongoing care of the roadside rain gardens in your neighborhood. You are doing your part to protect the health of Puget Sound!

The Barton CSO Control Project is featured in a video about raingardens and green stormwater infrastructure (GSI) by Sightline Institute (external link).

RainWise is 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 through 2016. Learn more.

Find out if a CSO is occurring in Barton

Related information