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“We are urging the EPA to step in and conduct an investigation to prevent further contamination,” said Frack-Free Colorado’s Suzanne Speigel in a statement. “This is a demonstration of our state’s failure to protect us from the dangers of industrial fracking.”

For many Coloradans, a bigger concern is the millions of gallons of raw municipal sewage from breached water-treatment plants during the historic flooding, which the anti-fracking groups have not yet addressed.

“Right now we should be worried about the sewage system — it’s a huge danger. We know what kind of public-health problems occur with that,” said Dan Kish, senior vice-president for policy at the pro-fracking Institute for Energy Research in Washington, D.C. “Your governor drank fracking fluid. Would he drink a glass of sewage?”