Overview
- The agreement includes more than 100 companies and public agencies identified as potentially responsible for contamination.
- The Lower Duwamish Waterway Group, including Boeing, the city of Seattle and King County, is leading design and construction under EPA oversight.
- In-water work began in November 2024 and will continue as dredging and engineered caps target the most contaminated sediments.
- More than 40 hazardous chemicals, including arsenic, PCBs and dioxins, have been found in the river from stormwater, wastewater and industrial practices.
- The cleanup spans Seattle’s major industrial corridor, with progress updates provided by the Lower Duwamish Waterway Group.