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Wastewater Treatment

King County, Washington

For questions about the Wastewater Treatment Division website, please send an e-mail message or contact us at:

King Street Center
201 S. Jackson St., Suite 500
Seattle, WA 98104-3855
Phone: 206-477-5371
Fax: 206-684-1741
Telecommunication device for the deaf (TTY): 711

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Staff Contacts

Kirkland Pump Station and Sewer Upgrade Project

Project overview

Project site plan
Project area


Replacing the pipeline coming into the Kirkland Pump Station
Replacing the pipeline coming into the Kirkland Pump Station, corner of 3rd Street and Park Lane

Rendering of the new Kirkland Pump Station.
King County's new Kirkland Pump Station will provide safe, reliable service for years to come

 Plan view, street view and pump station conceptual drawing
What will the area look like after construction?

The Kirkland Pump Station is located across the street from the King County Library (external link) and next to the Kirkland Transit Center (external link). The King County Wastewater Treatment Division worked closely with Sound Transit and the City of Kirkland to coordinate efforts and minimize impacts on the community and downtown businesses.

Project elements

New Sewer Pipeline on 3rd Street, under the new Transit Center

King County and Sound Transit partnered to install new sewer pipelines in 3rd Street, allowing complete restoration of the Transit Center and limiting disruptions to the Transit Center operations and businesses in the area.

New Kirkland Pump Station on the corner of Park Lane and 3rd Street

King County’s contractor will build a new, upgraded Kirkland Pump Station around the existing pump station while it is still in operation. This work requires careful sequencing to maintain existing operations.

Modifications to the county's Kirkland Pump Station will include: replacing pumps, odor control equipment, and emergency generator; electrical system upgrades; modernization of control instrumentation; and improvements to the building's exterior.

Force Main replacement on Kirkland Avenue from 3rd Street to Railroad Avenue

A force main will be installed in Kirkland Avenue, with a new connection to King County’s Eastside Interceptor at Railroad Avenue. The interceptor conveys wastewater flows to South Plant in Renton for treatment. King County is working with the City of Kirkland to identify events and activities that may need scheduling consideration. Force main construction is expected to take up to three months.

The new sewer connection at Railroad Avenue will require a traffic diversion. King County will provide updates to the City of Kirkland and the community as the project schedule is developed.