Brightwater Project

In response to increased growth in our region, King County has built a new regional wastewater treatment system called Brightwater. Treatment plant operations began in September 2011. The conveyance system and outfall began full operations in fall 2012. Final restoration work at some of the construction sites is scheduled to continue through late 2013.

The new facilities include a treatment plant, conveyance (pipes and pumps taking wastewater to and from the plant), and a marine outfall.

This Web site provides information about the project, including:

• a description of the project and facilities
• current project activities
• project background information

Tours, environmental education, open space, trails

The Brightwater Center is now open. The park grounds are open dawn to dusk everyday. The Brightwater Education and Community Center is open to the public Monday-Thursday 10 a.m. - 4 p.m.

Video: Brightwater grand opening (September 24, 2011). Local dignitaries and community members joined King County Executive Dow Constantine to celebrate an extraordinary regional investment in clean water with the start of Brightwater Treatment Plant operations.

Video: Installation of membrane bioreactor filters (MBRs) at the treatment plant (April 2011) 


Brightwater serves portions of King and Snohomish counties and supports our mission to protect public health and the environment.