Current and planned projects
The Coal Creek Sewer Upgrade Project will install new sewer pipes to carry more wastewater and meet the growing needs of Bellevue and Newcastle.
The Eastside Interceptor Section 8 Rehabilitation Project will repair 4,800 square feet of a 90- to 96-inch wastewater tunnel in Bellevue that is nearing the end of its useful life.
King County is planning to upgrade the Elliott West Wet Weather Treatment Station to ensure compliance with stricter environmental regulations, meet the demands of a growing population, and handle a changing climate.
The Georgetown Wet Weather Treatment Station reduces water pollution and improves aquatic habitat and overall water quality of the Duwamish River. The station is currently operational and a ribbon cutting celebration is scheduled in 2023 after artwork installation is complete.
The Interbay Sewer and Odor Control Upgrade Project will replace aging sewer pipes in Seattle’s Interbay neighborhood and add new odor control technology.
The Lake Hills and NW Lake Sammamish Sewer Upgrade Project will upgrade 4.5 miles of sewer pipes serving the growing Redmond and Bellevue area.
The Lake Hills Sewer Relining Project will install pipe lining along existing concrete pipe to prevent corrosion and extend the life of the pipe another 50 years.
The Lakeland Hills Pump Station Replacement Project will replace the aging Lakeland Hills Pump Station and build a new facility in Auburn to upgrade sewer services in south King County.
King County has completed construction of a new vehicle maintenance and staging facility in North Bend for transporting Loop biosolids to customers.
The M Street Trunk Rehabilitation Project will repair about 2.6 miles of deteriorated sewer pipes in the City of Auburn.
The North Mercer Island/Enatai Sewer Upgrade Project will replace aging pipes serving areas in North Mercer Island and Bellevue near Enatai Beach, and the Town of Beaux Arts Village.
The Sammamish Plateau Diversion Project will build new wastewater infrastructure to serve the growing East Lake Sammamish area.
Seattle Public Utilities and King County Wastewater Treatment Division are building an underground storage tunnel to significantly reduce the amount of polluted stormwater (from rain) and sewage that flows into the Lake Washington Ship Canal, Salmon Bay, and Lake Union from our sewer system.
King County is working on short-term and long-term solutions to reduce the risk of wastewater backups in South Park.
King County has a number of projects at the South Treatment Plant in Renton to replace or upgrade critical treatment plant equipment including pumps motors, and drives, which will improve system reliability, reduce maintenance costs and increase energy efficiency.
The Thornton Creek Basin Sewer Study and Upgrade Project will ensure that the basin’s sewer pipe is able to carry wastewater flows to meet King County’s clean water goals into the future.
King County’s plans to build a wet weather storage facility to hold stormwater and wastewater that currently overflows into the Duwamish River during large storms.
King County plans a number of improvements at the West Point Treatment Plant. Projects include upgrading and replacing aging equipment to ensure reliable operation and continued compliance with permit conditions.