Wastewater Treatment Division

Our regional wastewater treatment system has a big job to do. Not only does it operate around the clock to sustain a healthy environment, this vital infrastructure supports economic development that enables our region to thrive.

Wet weather resiliency

We are continually working to make our operations more resilient during winter storms in wet weather season, and making improvements at our West Point Treatment Plant.

We currently have major projects underway to improve our wastewater treatment system, including:

Georgetown Wet Weather Treatment Station
Ship Canal Water Quality (joint project with Seattle Public Utilities)
North Mercer Island/Enatai Sewer Upgrade

See how our system works:

Here are some quick navigation links:

Clean Water Plan - join the conversation

Pay capacity charge

Rent a Brightwater Center room

View CSO discharge status in Seattle area

Join in education & tours

Report a problem

View capital projects

Learn about finances & rates

View more services

Jameson Building Replacement Project: Come see how the new Jameson Building will better serve the people who protect your health and our waters.

Regional wastewater treatment plants

Brightwater, near Woodinville
South Plant, Renton
West Point, Seattle

Regional committees

MWPAAC - Metropolitan Water Pollution Abatement Advisory Committee

RWQC - Regional Water Quality Committee

Resources

WTD career opportunities and internships

Local sewer agencies

King County online directory

Public Records Officers

Department of Natural Resources

Public Health - Seattle and King County

Snowplow clearing snow at West Point Treatment Plant

WTD Snow Plow clearing snow from roads at West Point in Discovery Park in early January for staff, off-site crews and the LOOP trucks transporting biosolids.