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Project update

July 2017

Mercer Island Summer Celebration, Mercerdale Park
Saturday, July 8, and Sunday, July 9

For the third year in a row, we’ll have a booth at the Mercer Island Summer Celebration. Stop by our booth to learn more about the project and explore some “out of this world” microbes that help clean our water.

Mercer Island Summer Celebration 2016Mercer Island Summer Celebration 2016

Stay tuned for more events

We’ll post details here for additional events as we get them on the calendar. If there’s a community event you could like us to attend, please contact Kristine Cramer at or 206-477-5415.

Sign up for email or text updates

To sign up for text alerts, text KING MERCERSEWER to 468-311 for Mercer Island, and KING ENATAISEWER to 468-311 for Enatai. To sign up for email updates, please visit the public involvement page.


Contact us

Contact Kristine Cramer, community services lead at:


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Project description

With over 400 miles of pipes moving wastewater to one of our award-winning treatment plants, King County WTD works hard to maintain our system. We inspect and monitor our regional system and update plans for needed upgrades.

King County WTD needs to replace sewer pipes that serve areas in North Mercer Island, the southwest portion of Bellevue near Enatai Beach, and the Town of Beaux Arts Village . This pipeline carries wastewater from the North Mercer Island Pump Station to the Sweyolocken Pump Station in Bellevue.

Final pipeline route , January 2017


Project design will begin in 2016. Construction is expected to begin in 2019 and extend until 2022.

Click to view larger version .

Project location


Back to the capital projects overview map .

Related information

Regional Wastewater Services Plan

Local municipalities: