Skip to main content

King County is committed to recovering and reusing the products of the wastewater treatment process. Beneficially recycling the treated water and nutrient-rich biosolids and recovering energy from waste gases increases the efficiency of our wastewater treatment plants, conserves resources, protects the environment, and saves money.

Most recent WTD news release (view past news releases)

Sewer system services

Find information about the programs and services operated by WTD that support King County's regional wastewater conveyance and treatment system.

Learn about sewer system services.
An aerial view of the lower Duwamish River with Mount Rainier in the background.

Wastewater programs

Learn about WTD's programs to improve water quality, plan and prepare our wastewater system for regional growth, and protect public health and the environment.

Learn about our wastewater programs.

Capital projects

Find information about WTD's capital projects, including project descriptions, locations, and status, and how to sign up for project updates. 

Learn about our capital projects.
Georgetown wet weather station at night, blue lights illuminate the building.
Aerial view of a West Point Treatment Plant located on a narrow strip of land between a body of water and a forested Discovery Park.

Wastewater treatment facilities

The wastewater treatment plants within King County's service area include 3 large regional wastewater treatment plants, 2 small wastewater treatment plants, and 5 combined sewer overflow treatment facilities.

Learn more about wastewater treatment facilities.

Water, education, and community

WTD provides educational experiences about water for all ages, spaces for community events, and places to enjoy nature.

Learn more about water, education, and community.
Close-up of red-veined green leaves of Swiss chard growing in dark, rich soil.

Resource Recovery

Learn how Resource Recovery provides leadership around sustainability and the reuse of valuable products to support the mission of WTD to protect public health and the environment.

Learn more about Resource Recovery.