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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.
Updates
Spring 2026
Brightwater has a lot going on this spring! We are investing in projects, engaging with communities, and educating people of all ages about our wastewater system. More details are in our March email. Subscribe to our email list serv to stay up to date!
As the weather warms up, more people enjoy visiting Brightwater. The Brightwater trails area serves people of all ages and abilities, and wildlife. Thousands of children and adults enjoy these spaces all year long. We rely on you, our human visitors, to make sure everyone feels welcome and safe in these spaces.
When you're at Brightwater, you must always keep your dog on a leash and pick up their poo.This makes sure everyone, including other people, pets, and wildlife, can safely enjoy this space too!
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.