Holiday closure Monday May 28: Most county offices will be closed in observance of Memorial Day.

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: 206-684-1280
Fax: 206-684-1741
Telecommunication device for the deaf (TTY): 711

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

East Side Interceptor sewer improvement project

Completed spring 2003

Project map

Map of Construction Area, February 2002-March 2003

The King County Wastewater Treatment Division has completed a sewer improvement project in downtown Renton to restore lost capacity to the pipeline that carries wastewater from Eastside communities to the South Treatment Plant in Renton. Lost capacity was the result of repairs following the 1965 earthquake.

King County worked closely with the City of Renton and residents in the immediate construction area to reduce the negative impacts of noise, vibrations, truck traffic and street closures during the 12-month construction project. The project mostly affected sections of Houser Way South and Morris Avenue South.

Construction timeline

  • February-May 2002: Prepared and excavated access pits.
  • June-September 2002: Tunneled new sewer pipeline between access pits.
  • October-December 2002: Installed new city water and stormwater pipes.
  • February-March 2003: Repaved neighborhood streets and completed project.

Related information