King County Sewerline Upgrade

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North Mercer - Enatai Sewer Upgrade Project

King County is upgrading four miles of sewer pipeline across north Mercer Island and south Bellevue. In addition to the new sewer pipeline, King County will upgrade the County’s North Mercer Pump Station, as well as the City of Mercer Island’s Lift Station 11 at Fruitland Landing. The pipes, installed in the 1970s, are aging and reaching capacity. They serve north Mercer Island, southwest Bellevue near Enatai Beach Park, and the town of Beaux Arts. (Click map for a larger version)

The sewer upgrade is a big project that’s been years in the making and will involve years of construction. We expect construction to begin in early 2022 and be complete in 2025. Some of the work will be in heavily used public spaces, and some will be in residential areas. The end product will provide great public benefit, but the work to get there will involve inconveniences to residents and users of public spaces. The City of Mercer Island and King County are committed to keeping you informed about what’s happening and why.

Get a visual look at the project by taking an interactive tour online.

To learn even more, visit King County’s website at www.kingcounty.gov/mercerenataisewer

North Mercer - Enatai Sewer Upgrade Project

King County is upgrading four miles of sewer pipeline across north Mercer Island and south Bellevue. In addition to the new sewer pipeline, King County will upgrade the County’s North Mercer Pump Station, as well as the City of Mercer Island’s Lift Station 11 at Fruitland Landing. The pipes, installed in the 1970s, are aging and reaching capacity. They serve north Mercer Island, southwest Bellevue near Enatai Beach Park, and the town of Beaux Arts. (Click map for a larger version)

The sewer upgrade is a big project that’s been years in the making and will involve years of construction. We expect construction to begin in early 2022 and be complete in 2025. Some of the work will be in heavily used public spaces, and some will be in residential areas. The end product will provide great public benefit, but the work to get there will involve inconveniences to residents and users of public spaces. The City of Mercer Island and King County are committed to keeping you informed about what’s happening and why.

Get a visual look at the project by taking an interactive tour online.

To learn even more, visit King County’s website at www.kingcounty.gov/mercerenataisewer

  • September 2021 Update

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    After years of planning and design, construction is now expected to begin early next year (2022) on the Mercer Enatai Sewer Upgrade project. A new interactive "StoryMap" virtual tour through the construction zone will help everyone find out how the work will impact Mercer Island and what King County and the City are doing to prepare for construction. The StoryMap will also guide viewers through the construction techniques that King County uses, how it works with communities during construction, the history of the project, and more.

  • June 2021 Update & Video Tour

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    King County’s North Mercer Island - Enatai Sewer Upgrade project starts construction very soon. This important project will provide great public benefit, but the work to get there will involve inconveniences to residents and users of public spaces along the north end of Mercer Island. This new 5-minute video takes you on a virtual tour of the construction areas to see where crews will be working over the next several years. Watch it here.

  • Spring 2021 Newsletter

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    This spring and summer, King County will prepare for major construction activities, expected to begin in September 2021. That means it will finalize contract documents and job specifications, hire contractors to do the work, and get all the paperwork in place to get started.

    View Spring 2021 Newsletter here.

Page last updated: 06 December 2021, 18:32