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Brightwater wastewater
treatment system
Photo courtesy of King County
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Total cost: $1.8 billion
Size: 114-acre plant site; 13-mile deep-bore conveyance tunnel with three construction portals; one influent pump station; 600-foot-deep, mile-long marine outfall in Puget Sound off Point Wells
Groundbreaking: April 2006
Completion: Treatment plant is scheduled to begin operating in August; mining on the conveyance tunnel is scheduled to finish in late summer; tunnel will begin operating in 2012 after final lining and pipe installation
Owner: King County Wastewater Treatment Division
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