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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.
February 2025
Brightwater is part of King County’s regional wastewater system and serves parts of north King County and south Snohomish County.
Construction for the Alpha Hill Erosion Control Project in the south trails area is planned to begin in early 2025. To protect water quality, this project will install a rock wall, fence, and new landscaping around Alpha Hill. We'll send an update once this work is scheduled.
Learn more about this project and how you can get involved at Brightwater in the recent Brightwater email!
Read the recent Brightwater email.
Sign up for Brightwater emails to stay up to date!
Visit Brightwater’s Public Engagement web page to read past emails, newsletters, and blog stories related to Brightwater. Our 2024 Brightwater newsletter is available in English, Español (Spanish), 中文 (Chinese, Simplified), 正體字 (Chinese, traditional), and Русский (Russian).
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.
Learn more
- See how Brightwater’s Treatment System works.
- Get facts about Brightwater's operations.
- Learn how Brightwater contributes to a sustainable future for the surrounding community and environment.
- Explore educational opportunities, trails, and natural areas.