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Our treatment facilities

Learn about King County's wastewater and wet weather treatment facilities that protect water quality and public health in the central Puget Sound region.

Our wastewater treatment facilities effectively clean dirty water collected from our local sewer agencies while recovering valuable resources. We’re also committed to being a good neighbor and having a positive impact on the communities we serve. Learn more about our wastewater system and service area.

Learn how we promote equity and social justice and sustainability at all our facilities.

Regional wastewater treatment plants

Local wastewater treatment plants