Holiday closure Monday May 28: Most county offices will be closed in observance of Memorial Day.

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: 206-684-1280
Fax: 206-684-1741
Telecommunication device for the deaf (TTY): 711

Get Directions to our office location in Seattle, Washington.

Staff Contacts

Puget Sound shoreline next to the West Point Treatment Plant, Seattle

Barton CSO Control Project

Project library

You will need a PDF viewer to open and view documents linked off this page.

Note: view the meeting calendar for additional project handouts and presentations.

Project updates

  • Neighborhood community meetings: learn about the Green Stormwater Infrastructure Project in your neighborhood
    Wed. March 28, 6:30-8:30 p.m., and
    Sat., March 31, 10 a.m. - noon.
    View meeting calendar for meeting locations, handouts and presentations
  • Project update, December 2011
  • Field work notification, November 2011
  • Project update (letter to project area neighbors) and map, September 2011
  • A State Environmental Policy Act (SEPA) Determination of Nonsignificance (DNS) was issued on May 12, 2011 for this project. Comments were accepted through May 31, 2011. The SEPA DNS and environmental checklist can be viewed here.
  • Community meeting: learn more about the Green Stormwater Infrastructure Project in West Seattle
    Wednesday, April 6, 2011, 6:30 p.m. – 8 p.m., Westside School, 7740 34th Avenue SW
    View meeting calendar for meeting handouts and presentations.
  • Field Work Notification flier, March 2011.
    Field work will include soil sampling, installation of groundwater monitoring wells to learn more about seasonal groundwater levels and archeological surveys.

Fact sheets

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News releases

Alternatives Selection Phase (2007 to 2010) documentation

Note: view the Puget Sound Beach CSO Control Project library page for technical information, public outreach materials and news releases posted prior to and during the alternatives selection phase (2007 to 2010) of this project. Selected items are listed below:

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For more information

Regulatory agencies (external links)