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Brightwater Treatment Plant

Find information and facts about Brightwater Treatment Plant located near Woodinville, including the treatment process, capital and improvement projects, and visiting the facility and grounds.

June 2024

Brightwater is part of King County’s regional wastewater system and serves parts of north King County and south Snohomish County. Drier months are a good time for us to maintain our facilities and carry out projects across our regional wastewater system. Read Brightwater’s spring 2024 newsletter to learn how Brightwater Operations prepares for the next rainy season. You will also learn what you can do to prepare your property now for when the storms arrive.

Visit Brightwater’s Public Engagement web page to read past emails, newsletters, and blog stories related to Brightwater. Sign up for our emails to stay up to date!

Located just north of Woodinville, Brightwater Treatment Plant (Brightwater) began operating in 2011. It is our newest regional wastewater treatment facility and features an educational and event center, natural areas and hiking trails, and public art. Brightwater treats an average of 36 million gallons of wastewater per day from communities in northeast King County and southeast Snohomish County. The facility is nationally recognized for its award-winning design and its consistent compliance with state and federal discharge limits.


Aerial view of the Brightwater treatment plant, looking north.  

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