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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

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Staff Contacts

Georgetown Wet Weather Treatment Station  

Project design

Project description

June 30, 2016

On June 16, 2016, Charles Blanc and Tristan Surtees of Sans Façon, the art master planners for King County’s Combined Sewer Overflow system in Seattle, presented their vision for the system-wide art master plan. The CSO Art Master Plan lays the foundation for 4Culture to commission artwork at the intersection of water, infrastructure, society and the environment.

Please contact if you would like a copy of the presentation.

Art and Water presentation, June 16, 2016

Initial design work completed 

The Georgetown Wet Weather Treatment Station has completed initial design work. The equipment, layout, and building materials have been decided, and now the project team is working on more detailed engineering drawings, and finer details about the site such as lighting, fencing, and plant selection. Georgetown neighbors and the community Design Advisory Group provided important input into the station’s look and feel. See examples of how the community influenced the design in the newsletter and on the facility design page.

vicinity-map_325The Georgetown Wet Weather Treatment Station project includes the construction of a combined sewer overflow (CSO) wet-weather treatment station between the Brandon Street and South Michigan Street Regulator Stations, related pipes  and a new outfall structure to release the treated water into the Duwamish River. When constructed, the station can treat up to 70 million gallons of combined rain and wastewater a day that would otherwise have discharged directly to the Duwamish without treatment during storm events.


Untreated sewage and stormwater volume reduction at the Brandon and South Michigan Outfalls -- before project and after projectWhy does King County need to do this project?

This project is part of a larger Combined Sewer Overflow (CSO) Control Plan Amendment that will reduce combined sewer overflows into local water bodies and protect public health and the environment. In this plan, there are 14 current or approved projects left to complete to reduce overflows that occur in the regional wastewater system. Duwamish projects, including the Georgetown Wet Weather Treatment Station, were prioritized based on what King County heard from the community.

This facility greatly reduces untreated wastewater and stormwater from entering the Duwamish.

Project schedule

The project timeline is as follows:


How King County works with the community

This project will protect the investments being made to clean up the Duwamish River and it will continue creating a better, cleaner river for South Park, Georgetown and the region to enjoy.

public meeting

King County works with the community to provide project information and identify potential impacts.
Stay informed, stay involved as we share information through:

  • Individual meetings with community groups, organizations and leaders
  • Briefings to local community groups, agencies and jurisdictions
  • Advisory committees
  • Community meetings
  • Project newsletters and fliers
  • Project Web page
  • News releases

Building a sustainable future

King County builds and operates facilities that benefit our communities, environment and economy.

King County is using a third-party verification program called Envision to track its sustainability efforts on the Georgetown project. We consider all of the following to design this facility:

  • Public health and safety
  • System reliability
  • Lifecycle cost
  • The wastewater system’s benefits and burdens to the project area

How can I contact King County about this project?

For questions, comments, to request a project briefing, or information on the design advisory group, please contact Kristine Cramer at, 206-477-5415 or via feedback form.

Hear from you

Multilingual project information sheet, Fall 2015

Multilingual project information sheet

Project updates / news

Related information