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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 construction

March 2014 Update

Park Lane Reopens on March 13
Park Lane, between Main Street and Third Street, will reopen to two-way traffic on March 13, 2014. Opening the street will also restore 14 angular parking stalls. Small interior and exterior improvements continue at the pump station. See project update (March 12, 2014) and news release.

Wrapping up final improvements
The King County Wastewater Treatment Division is nearing completion on upgrades to the 40‐year‐old Kirkland Pump Station. Upgrades increase capacity, ensure safe and reliable operations and meet current seismic, noise, and odor control standards. It is anticipated that Park Lane will be opened in March 2014 (ahead of schedule). See project update (February 13, 2014).

Rain gardens140213_RainGarden2_400
Pump station frontage now includes landscaping, porous pavement and rain gardens to match the flexible street design planned by the City of Kirkland.

24-hour construction hotline, 206-205-9196
24 horas de línea directa de la construcción, 206-205-9196

As part of its mission to protect public health and the environment, King County is responsible for conveying and treating wastewater collected by 17 cities and 17 local sewer utilities in King, Snohomish and Pierce counties, including the City of Kirkland.

Project description

In September 2011, the King County Wastewater Treatment Division began work to upgrade the Kirkland Pump Station and Force Main to replace aging pump station equipment and to increase the capacity of the pump station. The pump station is located at the corner of Third Street and Park Lane in downtown Kirkland. Force main work will be carried out on Kirkland Avenue from 3rd Street to Railroad Avenue, where new pipelines will be connected to King County’s existing conveyance system. Work on pipelines in Third Street was completed as part of Sound Transit’s Kirkland Transit Center Project.

Need for project

King County has operated the Kirkland Pump Station for more than 40 years. The pump station needs to be upgraded to:

  • Replace aging pump station equipment and sewer lines to ensure safe and reliable operations for years to come.
  • Increase pumping capacity to accommodate growth from 6 million gallons per day (mgd) to a peak capacity of 9.4 mgd.
  • Meet current design standards, including odor and noise control.

The pump station receives flows from downtown Kirkland and pumps it east to the main conveyance pipe which takes the wastewater to King County's South Treatment Plant in Renton.


2007 – 2011 Pump station and sewer design
Winter/Spring 2011 Influent sewer complete in Third Street (as part of Transit Center)
Fall 2011 Construction starts
Fall 2011 – Fall 2012 Forcemain construction
January 2014 New pump station fully operational
Spring 2014 Park Lane open and pump station construction complete

Construction timeline

What to expect

  • Closure of Park Lane between Main Street and Third Street for construction staging.
  • Activity typical of a construction site: work crews, truck hauling, construction materials, and heavy machinery.
  • Work hours will typically occur from 7:00 a.m. to 5:30 p.m. Monday to Thursday.
  • People may experience traffic delays, noise, and dust associated with activities.
  • During Kirkland Avenue force main work, traffic control and flaggers onsite to manage traffic flow and access.
  • Project and construction updates on the Web.
  • 24-hour construction hotline, 206-205-9196.

Being a Good Neighbor

King County is committed to being a good neighbor and will work directly with the community throughout the project to minimize construction impacts whenever possible. Residents can expect:

  • Advance notice of construction activities – mail, e-mail, phone
  • One-on-one problem solving with residents directly impacted by construction activities
  • Project website and construction updates
  • 24-hour construction hotline 206-205-9196

News releases

Project updates

For more information

Related topics (external links)