Seattle's Ship Canal Water Quality Project Advances to Final Construction Phase
The Ship Canal Water Quality Project in Seattle has entered its final construction phase, focusing on conveyance systems for a total investment of US$570 million. This initiative aims to significantly reduce untreated stormwater discharge into local waterways, enhancing water quality and meeting environmental regulations by 2027.

Seattle's Ship Canal Water Quality Project has progressed to its final construction phase, emphasizing the completion of microtunnels and pumping infrastructure. With a budget of US$570 million, this initiative, led by Seattle Public Utilities and the King County Wastewater Treatment Division, aims to mitigate combined sewer overflow discharges into the Lake Washington Ship Canal and adjacent bodies of water.
Key achievements include the completion of a 2.7-mile storage tunnel and the Ballard Tunnel Effluent Pump Station. Current activities involve microtunneling and infrastructure connections across several neighborhoods, with additional work transitioning to street restoration. The system is designed to temporarily store millions of gallons of wastewater during storms, significantly improving water quality upon completion in 2027.




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