From PBS NewsHour.

A sewage spill along the Potomac River, and the struggle to contain it, are raising alarms. A major sewer line collapsed last month, sending hundreds of millions of gallons of waste into the water before it could be diverted to a treatment facility. Experts say it could be one of the largest sewage spills in U.S. history. Amna Nawaz discussed more with Hedrick Belin of the Potomac Conservancy.

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