Hydraulic fracturing fluids contain chemicals that are known or potential human carcinogens, according to a report released by Reps. Henry Waxman, D-Calif., Edward Markey, D-Mass., and Diana DeGette, D-Colo. The report also said that natural gas drillers use nontoxic substances in fracking fluids including citric acid and salt. Though the fluids "contain things you would never want to drink ... the only way that'd be relevant in a public-health context is if those materials were somehow finding their way into potable water supplies underground," an industry-group spokesman said.

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