Photo of a one story industrial building.

North Mercer Pump Station

Construction is underway

This StoryMap focuses on the North Mercer Pump Station. To learn more about the Mercer Enatai Sewer Upgrade project as a whole, visit the  project website .

This is a map of the entire project area with North Mercer Pump Station on the Left and Sweyolocken Pump Station on the right. There is a line between the two showing the pipe alignment.
This is a map of the entire project area with North Mercer Pump Station on the Left and Sweyolocken Pump Station on the right. There is a line between the two showing the pipe alignment.

The blue line on the map shows the new sewer pipeline. King County is also upgrading the North Mercer Pump Station and the City of Mercer Island's Lift Station 11.


What are we building?

Photo of a driveway lined with trees leading to the pump station.
Photo of a driveway lined with trees leading to the pump station.
Image of two pieces of metal equipment that are painted turquoise.
Image of two pieces of metal equipment that are painted turquoise.
Image of electrical equipment.
Image of electrical equipment.

What to expect

Construction is disruptive.

We will send out alerts so you can plan ahead if you live near the active work area.

Neighbors will see changes at the pump station as work gets underway. Hit the arrow on the right to scroll through photos of what the site could look like during construction.

Image of a retaining wall.
Image of work trailers.

Image of a woman in a hard hat and safety vest holding a communication device and a stop sign.

Schedule and duration

Construction is underway and is expected to last through 2025. We will provide a more detailed schedule on our website and by email once it is available.

Construction schedules often change. Please  sign up for the email list  about this section of the project to receive the most up to date information as it becomes available.


What you'll see when the work is done

The North Mercer Pump Station and surrounding property will look different when the project is complete.

Conceptual drawing of the North Mercer Pump Station with a long driveway and vegetation.
This is a drawing meant to show that there is a lot of equipment below ground in the pump station. It lists the Control Room, the Equipment Room, the Header Room, and the Pump Room.

How to reach us

We are committed to working with you during construction.

Photos of staff working with community.

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The blue line on the map shows the new sewer pipeline. King County is also upgrading the North Mercer Pump Station and the City of Mercer Island's Lift Station 11.