King County's Wastewater Treatment Process

The process used at our two regional treatment plants provides secondary treatment (preliminary, primary and secondary treatment, and disinfection). The image below shows the basic steps in the treatment process. Move your mouse over the image and click on the "hot links" to view more information about programs and processes.

Besides our principal work of treating wastewater, we provide odor control, have pilot projects to try out new wastewater treatment technologies, and strive to be a good neighbor during construction.

To find out more about King County's wastewater system:

• Visit the home pages for the West Point and South treatment plants.
• View facts at a glance about the King County Regional Wastewater System, including:
  • local sewer utilities
  • service area
  • sewer rate
  • annual budget
  • system and treatment plant facts and data (for most recent year available)
• View King County wastewater (NPDES) permits (for discharged treated wastewater) issued by the Washington State Department of Ecology.
• Learn about the history of King County's Regional Wastewater Treatment Utility.

Brochures

Other brochures appear on program pages on this Web site. The Adobe Acrobat reader is required to view the brochures (.pdf files) linked off of this page.

• Wastewater Treatment Division (565 KB)
• Our Vision: Creating Resources from Wastewater
• West Point Treatment Plant (1.05 MB)
• South Treatment Plant (1.1 MB)
• Biosolids Recycling (2.6 MB)
• Off-site Facilities
• Discharging Industrial Wastewater in King County (118 KB)
• Odor Control
• Being a Good Neighbor During Construction
• Can We Talk Trash?
  If it's not biodegradable, put it in the trash can, not the toilet, or recycle it.

Back to Wastewater Treatment Division Home Page

Updated: April 16, 2008