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

Get Directions to our office location in Seattle, Washington.

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

Carnation Treatment Plant

Carnation Treatment Plant, 2009
Carnation Treatment Plant
4405 Larson Avenue, Carnation, Washington

Carnation Treatment Facility - 2008 WateReuse Association Small Project of the Year
Carnation Treatment Facility -
2008 WateReuse Association Small Project of the Year (PDF).
Learn more about WateReuse Association (external link)

Welcome to Chinook Bend Natural Area
Highly treated reclaimed water from the Carnation Treatment Plant is used for wetland enhancement at Chinook Bend Natural Area.

Welcome to the Carnation Treatment Plant, located at 4405 Larson Avenue, in the City of Carnation, Washington.

The plant serves the City of Carnation as part of King County's regional system that treats wastewater for about 1.5 million people in the Puget Sound region. The collection system, owned and maintained by the City of Carnation (external link), delivers sewage to the plant from residential and commercial customers.

Announcements

  • Schedule a plant tour.
  • Field Day at Chinook Bend Natural Area -
    Several dozen folks stopped by the Chinook Bend Field Day on August 6th to tour the site with ecologists and learn about how reclaimed water, a number of restoration projects and art are enhancing this beautiful natural area.
    The Chinook Bend Natural Area is located next to the Snoqualmie River

In the news

Carnation Wastewater Treatment Plant featured in Water Efficiency, the Journal for Water Resource Management, March-April 2011. View Epitome of Efficiency -- Water reuse is attracting large engineering and manufacturing companies as its implementation expands (external link)

News releases

Related information

Sewer System Brochure Carnation Sewer System Owner's Manual is available to download (.PDF file, 934KB). This brochure provides sewer tips (including care of the candy cane-shaped air vent in your yard and what is appropriate to put in your toilet and drain) and information on household hazardous waste disposal.