North King County/South Snohomish County projectsConstruction is winding down on the largest expansion of the regional wastewater treatment system since the 1960s. Component testing has already begun at the Brightwater Treatment Plant, which is nearly completed and on schedule to begin operating in August. The plant’s adjacent community and education center, along with more than 70 acres of restored habitat and public space, will be open to the community in September 2011. Contractors are scheduled to complete mining on the remaining 1.5 miles of tunnel in September. Learn about construction activities at the plant site and conveyance portals. View construction contracts and RFPs. North Creek PipelineIn 2011, King County is beginning initial design on a project to replace a 14,275-foot segment of sewer line that carries wastewater from a large portion of south Snohomish County to King County’s regional system for treatment.
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