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

King Street Center
201 S. Jackson St., Suite 505
Seattle, WA 98104-3855
Phone: 206-684-1280
Fax: 206-684-1741
Telecommunication device for the deaf (TTY): 711

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Puget Sound shoreline next to the West Point Treatment Plant, Seattle

Matthews Park pump station and sewer improvement project

Completed fall 2006

King County protects public health and the environment by conveying and treating the region's wastewater. To ensure safe and reliable operations in the future, the King County Wastewater Treatment Division has completed three projects in the Matthews Beach area to upgrade aging infrastructure. These facilities (see map below) carry wastewater from the north end of Lake Washington and the City of Seattle to the West Point Treatment Plant in Discovery Park.

Project site map

What we've accomplished

Since 2002, King County has completed three projects in the Matthews Beach area to upgrade aging infrastructure:

  • Upgraded the pump station
  • Repaired corroded concrete inside the North Portal (entrance) to the Lake City Tunnel in 2002
  • In 2003, repaired the Matthews Park force main by slip lining the existing 42-inch pipe with a new plastic pipe. Slip lining the force main minimized construction-related disruption and extended the life of the pipe.

Construction updates

  • Fall 2006 (224KB, PDF)
  • September 2005 (579KB, PDF)
  • Summer 2005 (505KB, PDF)
  • Fall 2004 (540KB, PDF)

Related information: