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DC to step up its bacteria tests in Potomac River, more than a month after sewage spill

D.C. will conduct daily E. coli tests at six river sites after over 240 million gallons of sewage spilled, with recent tests showing bacteria levels returned to normal.

  • Beginning Monday, the D.C. Department of Health will begin daily E. coli testing in the Potomac and Anacostia rivers, scaling up from weekly tests to provide more community information.
  • After the Potomac Interceptor sewage line collapsed on January 19, 2026, over 240 million gallons of sewage spilled into the Potomac, prompting Maryland and Virginia advisories for safety.
  • DOEE will begin testing at three Potomac, two Anacostia and one Washington Channel site while the EPA provides lab space and staff, and D.C. Water continues daily Potomac testing begun in January.
  • D.C. plans to lift its recreational advisory Monday and welcome residents and recreational users back, while Maryland officials and Virginia officials will keep their advisories in effect; officials said drinking water quality remains unaffected.
  • Authorities will post results within 48 hours and plan daily testing through at least the early part of the summer while reviewing data over a six to eight weeks period as local fishers and businesses face pressures with the season starting next week, officials said.
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WUSA9 broke the news in Washington, United States on Friday, February 27, 2026.
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