A third of the District uses the same drain system for both sewage and storm water. During heavy rains, this system is overwhelmed and raw sewage is released into D.C. waterways. In progress is a $2.6 billion project to build 13 miles of new tunnels and make system upgrades that will reduce 96 percent of the overflow runoff by 2025.

Source: D.C. Clean Rivers Project | The Washington Post November 16, 2011
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