About the North Mercer Island/Enatai Sewer Upgrade

Project schedule 

Project design began in 2016 and was completed in 2021. Construction began in early 2022 and will continue through 2025. View the summer 2024 project newsletter for more information about the project. 

Project overview 

The North Mercer Island/Enatai Sewer Upgrade Project spans approximately four miles across North Mercer Island and Southwest Bellevue. To learn more about the project overall, including what we are building, construction information, and what to expect, view our StoryMap.

To meet community needs, we broke the project up into eight project areas, shown on the map and listed below. We provide updates about specific areas depending on where work is taking place.

Click on a project area link below to find specific information and an area StoryMap, and to sign up for area-specific email or text updates.