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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.
December 2024
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 expected to begin in January 2025. To prepare for construction, crews will be surveying the landscape and installing environmental protections around Alpha Hill.
King County contractors will be working at the base of Alpha Hill for approximately three months to install a rock wall, fence, and landscaping. This project will help protect Little Bear Creek, a salmon-bearing stream, from erosion and improve drought tolerance.
To keep everyone safe, a section of Brightwater trails near Alpha Hill will be closed during construction. This is expected to begin in January. Please stay on open trails to protect the surrounding landscape. Once construction is complete, this project will not change access to the three miles of maintained trails at Brightwater.
Read the recent Brightwater email.
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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.