Wastewater Treatment Division Recommended Combined Sewer Overflow Control Plan
Our recommended plan calls for controlling all King County CSO locations to an average of no more than one overflow per year at each location. To meet this goal, we propose constructing nine projects in the Lake Washington Ship Canal area and in industrial areas near the Duwamish River. We’re recommending that the projects in the Duwamish River area be finished first to support ongoing regional efforts to clean up the river. In addition, we’re recommending that the projects incorporate green stormwater infrastructure where possible and that we meet the schedule recommended in previous plan updates to complete all projects by 2030.