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DC Water reports progress on Clean Rivers tunnels, cites climate and aging infrastructure risks
Summary
DC Water told the council it has made measurable progress on the Clean Rivers program — including large reductions in combined sewer overflow volume and milestones on the Potomac River Tunnel — while warning climate variability and aging mains will require sustained investment.
DC Water officials used the committee hearing to update members on the Clean Rivers project and system resilience. CEO David Gaddis described recent tunnel construction progress, cited substantial reductions in combined sewer overflow (CSO) events and stressed the system’s vulnerability to aging assets and extreme weather.
Results and metrics: DC Water provided high‑level performance figures for work completed through 2024: reductions in annual estimated CSO volumes, with system‑wide CSOs reduced by about 96% in the authority’s modeling and reductions to the Anacostia by about 98%, to the Potomac by about 93% and to Rock Creek by about 90%…
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