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DC Water reports progress on Clean Rivers tunnels, cites climate and aging infrastructure risks
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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% in an average rain year. DC Water also said the Clean Rivers program will reduce the frequency of flooding in low‑lying neighborhoods previously exposed to 15‑year storm risk and reduce nitrogen discharges to the Chesapeake Bay by roughly 1 million pounds per year once completed.
Operational context and risk: Officials told the committee the authority saw four precautionary boil‑water advisories in 2024 and that a major December main break involved a 30‑inch main that dated back to the Kennedy administration. DC Water leaders said aging assets, climate change and higher storm intensity will increase the probability of pressure events, main breaks and other shocks that create boil advisories or service interruptions. The authority described steps to increase resilience including capital planning, larger program financing, refining emergency communications and leveraging its credit rating to reduce debt costs (a 2024 refinancing the authority cited saved some $75 million of interest cost over 20 years).
Regional work and biosolids: DC Water said it participates in regional discussions about secondary water sources and storage and detailed its Clean Rivers work as a foundational climate‑adaptation investment. Sierra Club witness Larry Martin discussed DC Water’s biosolids product and PFAS concerns; he said phase‑1 of a report on cumulative risks from biosolid use would be presented to the committee in the year ahead.
Why it matters: The tunnel projects address long‑standing pollution and flooding problems and also pose significant multi‑decade financing and construction challenges. The committee asked for continued updates as work proceeds and sought clearer data to correlate tunnel progress with local flood reduction and water‑quality improvements.
Ending: DC Water promised further reporting and said it would provide data and updates on the Potomac River Tunnel and other Clean Rivers milestones at future committee meetings.
