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The same EPA report warned that fracking fluid could escape from drill sites into the groundwater and that leaks. Approved Toxic Chemicals for Fracking a Decade Ago, New Files Show The New York Times For much of the past decade, oil companies engaged in drilling and fracking have been allowed to pump into the ground chemicals that, over time, can break down into toxic substances known as PFAS a class of long-lasting compounds known to pose. scientists evaluating new chemicals “are the last line of defense between harmful - even deadly - chemicals and their introduction into U.S. According to the Times: In a 2016 report, the EPA identified more than 1,600 chemicals used in drilling and fracking, or found in fracking wastewater, including close to 200 that were deemed carcinogens or toxic to human health. office in charge of reviewing toxic chemicals tampered with the assessments of dozens of chemicals to make them appear safer. In recent days, whistle-blowers have alleged in the Intercept that the E.P.A. They will fund up to an additional 25 million if they settle similar claims with other states for more than 50 million. The three companies reached a cost-sharing agreement earlier this year. in 2011 approved the use of these chemicals, used to ease the flow of oil from the ground, despite the agency’s own grave concerns about their toxicity, according to the documents, which were reviewed by The New York Times. Chemours, DuPont’s former performance chemicals unit, will contribute 25 million. “For much of the past decade, oil companies engaged in drilling and fracking have been allowed to pump into the ground chemicals that, over time, can break down into toxic substances known as PFAS - a class of long-lasting compounds known to pose a threat to people and wildlife - according to internal documents from the Environmental Protection Agency.