DC Water reports progress on Clean Rivers tunnels, cites climate and aging infrastructure risks

Feb 20, 2025

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.

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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.

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