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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

November 2015

The Barton CSO Control Project construction phase is complete, and the construction hotline has been deactivated.

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.

raingarden maintenanceraingarden maintenance

Here is what crews will be doing:
• Monitoring plant health
• Removing weeds
• Monitoring drainage
• Removing debris and trash
• Clearing curb inlets and gutters
• Caring for the pipes and deep wells
• Gathering ongoing information on the performance of roadside rain gardens

To view the maintenance schedule and Operations and Maintenance (O&M) Manual, visit the facility operations page. King County will share performance data once it is collected.

Project description

King County constructed 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 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.


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