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Most Drillers Keep Chemicals Secret in FracFocus, EPA Says

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Most oil and gas drillers kept secret at least one chemical used in hydraulic fracturing, an analysis by the Environmental Protection Agency found, raising environmentalists’ concerns about risks from unknown and possibly dangerous ingredients.

The EPA scoured filings on the industry-backed FracFocus online registry and found 11 percent of ingredients used in fracking were deemed a business secret and not disclosed. The EPA said Friday 70 percent of wells examined used at least one chemical that was unidentified.