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Massive Potomac Sewage Spill Contaminates River with Extreme E coli Levels

A 6-foot sewer pipe collapse in Montgomery County released about 40 million gallons of sewage daily, causing E. coli levels 12,000 times above safe limits at the spill site, experts said.

  • On Jan. 19 a major underground sewer line ruptured in Montgomery County, sending nearly 300 million gallons of sewage into the Potomac River, the Potomac Riverkeeper Network reported.
  • At the rupture near Cabin John at Lock 10, sewage gushed several feet into the air and flowed into normally dry stretches of the C&O Canal before reaching the Potomac Interceptor.
  • Potomac Riverkeeper Dean Naujoks said testing on January 23 showed a Lock 10 sample measured 4,884,000 MPN, 11,900 times the 410 MPN safety limit, with Fletcher's Boathouse 60 times above safe E. coli levels.
  • DC Water says crews are operating a temporary bypass and have sharply reduced the stream delivering millions of gallons each day while repairs continue, and officials say the drinking water supply is not affected.
  • Potomac Riverkeeper Network officials warn that January 23 testing shows the discharge contains bacteria, pathogens and parasites now impacting the river ecosystem and suggests long-term effects.
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US Capital Washington Under Fire After Massive Sewage Leak

A nonprofit says authorities in the US capital Washington have failed to properly warn the public about a massive sewage leak into the Potomac River, thought to be among the largest such spills in the nation's history. A six-foot-wide rupture in an aging line on January 19 released 40 million gallons of raw effluent until January 24, when DC Water, the city's water utility, activated a bypass that channeled the flow through a canal and back into

·New York, United States
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Las Vegas Sun broke the news in Las Vegas, United States on Friday, January 23, 2026.
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