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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

Get Directions to our office location in Seattle, Washington.

Staff Contacts

Barton Street Pump Station upgrade project

Project construction

May 11, 2015

On Wednesday, May 13, the north ferry lane will be closed from 7 a.m. to 2 p.m. Crews will be pouring concrete for a curb next to the ferry lane.

Keeping ferry traffic moving
King County has been working closely with Washington State Ferries throughout the project to ensure minimal disruption to traffic along Fauntleroy Way SW and to keep ferry traffic moving.

While the north ferry lane is closed, commuters can expect flaggers as necessary to assist pedestrian and bike traffic during work hours..

View Construction Update (PDF, May 11, 2015).

Please call the project hotline with any questions or concerns: 206-296-2999.

We appreciate your ongoing patience during construction!

Future facility
 Landscape site plan
Landscape site plan

Southeast view of the proposed Barton Pump Station upgrade
Southeast view

Need for project

King County protects public health and the environment by conveying and treating the region's wastewater. The Barton Street Pump Station is 50 years old. King County must upgrade the facility to accommodate West Seattle's growing population and ensure its safe and reliable operation for the next 50 years.

The pump station is an underground facility located next to the Fauntleroy ferry landing at 9005 Fauntleroy Way, SW. The pump station pumps wastewater to the Murray Avenue Pump Station which then pump flows to the county's regional treatment plant at West Point in Seattle.

What you can expect during construction

  • Typical construction activities including work crews, truck hauling, construction materials and heavy machinery
  • Work hours in compliance with City of Seattle permits, which typically allow work between 7 am and 6 pm Monday to Friday
  • Advance notice provided of work outside regularly scheduled hours
  • Access at all times for ferry traffic, emergency vehicles, and neighborhood residents
  • No beach access during construction
  • State patrol on site for traffic control for duration of construction

View construction schedule here.

Proposed work

The pump station was first constructed in 1958. The following necessary improvements will be made:

  • Replace outdated electrical equipment, pumps, and associated equipment. The new pumps will increase capacity from 22 million gallons per day (mgd) to 33 mgd
  • Upgrade heating, ventilation and air conditioning
  • Construct a new underground vault to house a new backup generator system and a new odor control system
  • Construct a new underground valve room and install new valves for the two 24-inch force mains that were installed as part of a 2006 emergency repair project

These upgrades will require the demolition of the existing below ground pump station and the construction of a temporary pumping system that will be removed once the new system is operational.

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 via mail, email, phone, and project fliers
  • One-on-one problem solving with residents directly impacted by construction activities
  • Project website and construction updates
  • 24-hour construction hotline
  • Restoration of landscaping

Construction schedule

Barton Street Pump Station Upgrade Construction Timeline

View construction schedule as PDF.

Project updates

News releases

For more information

Sheet Pile Driving Video
Learn how King County Wastewater Treatment Division creates safe underground work environments using a technique known as sheet pile driving (WTD YouTube Channel). During the winter and spring of 2013, King County used a vibratory hammer to install sheet piles, a technique which works well in tight spaces with minimal impacts on nearby neighbors and the environment.

Related information