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Most King County offices will be closed on Monday, January 16, 2017, for Martin Luther King Day.  
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Project update

January 11, 2017

Join King County at an upcoming community meeting to learn about the final pipeline alignment for the North Mercer/Enatai Sewer Upgrade Project. See the invitation HERE .

Wednesday, January 25, 6 – 8 p.m.
Mercer Slough Environmental Education Center
1625 118th Ave SE, Bellevue

Thursday, January 26, 6 – 8 p.m.
Mercer Island Community and Event Center
8236 SE 24th St, Mercer Island

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:


 Feedback form

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.

1611_NMI-enatai-map_700Recommended alternative , November 2016


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: