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The Third Avenue entrance to the King County Courthouse is temporarily closed. Please use the Fourth Avenue entrance.  
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Tours are available (but limited) at the Carnation plant.

Classroom support resources are available for schools and community groups.  

Tour information

  • Tours are available for college and professional groups upon request.
  • Submit a request for a tour.

Schools and community

tour group at Carnation Treatment PlantHeadworks building

View more photos on our Flickr site  .

Contact us

24 hour emergency and odor reporting:   206-263-1760
Administration:  206-263-1760 

4405 Larson Ave.
Carnation, WA 98041

Directions and map