Brightwater treatment system

Completed – Fall 2012

In response to increased growth in our region, King County has built a new $1.86 billion regional wastewater treatment system called Brightwater to serve the northern portion of the King County service area. Treatment plant operations began in September 2011. The conveyance system and outfall began full operations in fall 2012.

Brightwater treatment system  . View more detailed 11x17 inches map  .

The new facilities include:

• The Brightwater Wastewater Treatment Plant is located in unincorporated Snohomish County, north of Woodinville. The plant is designed to have the capacity to treat an average of 36 million gallons of wastewater per day (mgd). By 2040, treatment capacity could be expanded to 54 million mgd.
• The conveyance system is the tunnels, pipes, and other facilities that carry wastewater to and from the treatment plant. The Brightwater system includes 13 miles of pipeline built in underground tunnels, shallower connector pipes, and an influent pump station to send wastewater to the plant.
• The marine outfall consists of twin, 5-foot-diameter pipes with a diffuser at the end where highly treated wastewater from the Brightwater Treatment Plant is discharged into Puget Sound. The mile-long, 600-foot-deep outfall extends off of Point Wells.

Project photos

The following links point to Flickr photo albums .

Marine outfall (off of Point Wells)

Conveyance facilities (pipelines and portals)

Treatment plant (near Woodinville, WA)

Reclaimed water system

North mitigation area (north end of treatment plant site)

Environmental education center (north end of treatment plant site)

Marine restoration (at the marine outfall)

Project videos

The following links point to DNRP Vimeo  videos.

Brightwater plant test (May 2011)
Video length: 17 seconds

Installation of membrane bioreactor filters (MBRs) at the treatment plant (April 2011)
Video length: 2 minutes, 32 seconds

Earth week at Brightwater Center (April 2011)
Video length: 2 minutes, 4 seconds

Brightwater Treatment Plant introduces tunneling equipment (September 2007)
Video length: 1 minute, 46 seconds

Take a tour of the Brightwater habitat restoration (April 2007)
Video length: 4 minute, 16 seconds