Skip to main content
The Third Avenue entrance to the King County Courthouse is temporarily closed. Please use the Fourth Avenue entrance.  
King County logo

The Carnation plant is an advanced treatment facility that uses a membrane bioreactor (MBR) system.

The MBR system sucks wastewater through hollow fibers with microscopic pores small enough to filter out particulate matter and even individual bacteria.

rsz_15227869668_04fc577c6e_zUV disinfection

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