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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 2026
Updates
Brightwater has a lot going on! We are investing in projects, engaging with communities, and educating people of all ages about our wastewater system. More details are in our recent email. Subscribe to our email list serv to stay up to date!
Projects to keep the plant working reliably
In March, crews will pothole and survey an area near the Brightwater entrance. Crews will use a vacuum truck to dig the potholes. Then, they will locate and survey underground utilities. This work will last 1 to 2 days. This work is scheduled to occur on March 12 and 13 (if needed).
During this work, people can expect more noise than usual. There will be traffic control and flaggers directing traffic. Please travel carefully and follow all signs and instructions from crews.
Upcoming learning opportunities
Join us for Composting 101: A Beginner’s Guide to Composting on Saturday, March 21 from 10am to 12pm at Brightwater. This 2-hour lesson will cover the basics of how to make and use compost. Register in advance to save your spot!
Read about all of this and more in our recent 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 about Brightwater.
Located just north of Woodinville, Brightwater Treatment Plant (Brightwater) began operating in 2011. Brightwater is part of King County’s regional wastewater treatment system. In addition to treating wastewater, Brightwater features an education and event center, natural areas and trails, and public art.
Brightwater serves around 300,000 people and businesses in north King and south Snohomish Counties. On average, Brightwater treats around 20 million gallons of wastewater (mgd) per day. During peak flows when we get a lot of rain, Brightwater treats around 35 mgd.
Brightwater operates all day, every day to protect public health and the environment. 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.