North Mercer Island/Enatai sewer upgrade
Wastewater Treatment Division (WTD) operations and projects
WTD operations staff remain on the job 24/7 to ensure the region’s wastewater treatment service continues. More information on how to report a problem you believe may be related to the County’s wastewater treatment system is available here: https://www.kingcounty.gov/depts/dnrp/wtd/response.aspx
The King County Wastewater Treatment Division remains committed to sharing information and gathering feedback from community members about its work and projects. WTD staff remain available to answer questions via email and phone during regular business hours. Project information lines remain available and are being monitored for ongoing construction projects.
February 12, 2021
Electrical line relocation work on 35th PL SE extended
King County has been working with Puget Sound Energy to relocate gas and electrical lines away from the future sewer pipeline. Gas line relocation work is on schedule along 35th PL SE, but relocation of the electrical line is taking longer than expected. Work is now anticipated to continue through mid-March. Read more about work on 35th PL SE .
If you are interested in a project update for your community group or neighborhood, please contact Kristine Cramer at 206-477-5415 or Kristine.firstname.lastname@example.org.
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.
View larger version . December 2018
Project design began in 2016 and will be complete in 2021. Construction is expected to begin in 2021 and extend until 2025.
Contact Kristine Cramer, community services lead at:
Shai Malone at
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.
Back to the capital projects overview map .