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Project update

June 15, 2018

Join us at Mercer Island Summer Celebration on July 14 and 15. This will be our fourth year at the Celebration – we can’t wait to meet more community members!

We’ll be out in the community this summer. Check back here for more details. Have an event you’d like us to come to, or a group we should meet with? Contact Kristine Cramer at or 206-477-5415.

Project staff manning the “Poop Deck” at the 2015 Summer CelebrationProject staff manning the “Poop Deck” at the 2015 Summer Celebration

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.

1701_NME-final-pipeline-route_700View larger version. July 2017


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

Project TimelineClick to view larger version .

Project location


Back to the capital projects overview map .

Related information

Regional Wastewater Services Plan

Local municipalities: