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Vashon Wastewater Treatment Plant -- Upgrade Project, completed fall 2006

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The Vashon
"Experience Clean Water Project"

The Vashon "Experience Clean Water Project" -- click for larger version.
Click for larger version.
Also available as PDF file (390 KB).
Read Spring 2007 project update
(1.3 MB, PDF)

Vashon Treatment Plant (May 2007)
Vashon Treatment Plant
Electrical building (left),
oxidation ditch (center) and
secondary clarifiers (right)
(May 2007)

A dedication ceremony was held in May 2007 to celebrate the new treatment facility.
A dedication ceremony was held in May 2007 to celebrate the new treatment facility.
May 2, 2007, News Release -- Dedication ceremony to celebrate new Vashon Island treatment facility

Administration Building (May 2007)
Administration Building
(May 2007)

Oxidation Ditch (May 2007)
Oxidation Ditch
(May 2007)

Secondary Clarifiers (May 2007)
Secondary Clarifiers
(May 2007)

Plant Upgrade Designs

Vashon TP landscape plan
Landscape Plan
Click for larger version.
(Also available as PDF - 179 KB)

Site Plan
Site Plan
Click for larger version.
(Also available as PDF - 128 KB)

Upland and Marine Action Areas
Upland and Marine Action Areas
Click for larger version.
(Also available as PDF - 34 KB)

To ensure safe and reliable operations of the Vashon wastewater treatment plant, the state Department of Ecology, King County and Vashon Sewer District decided the plant needed to be upgraded.

The upgraded Vashon Treatment Plant has increased capacity, added backup systems and move the marine outfall farther out in the Puget Sound. These improvements were needed to meet regulatory requirements and will protect human health and the environment.

Project Shedule

  • Final design completed
  • Final permitting: Spring 2004
  • Construction starts: Fall 2004
  • Construction ends: Fall 2006

Project Updates

For more information

Department of Natural Resources and Parks
Wastewater Treatment Division
201 S. Jackson St.
Seattle, WA 98104-3855
Fax: 206-684-1278

Updated: April 23, 2008


 

Related Information:

WTD Facts at a Glance

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