Republicans on the House Energy and Commerce Committee sent a letter Tuesday to Environmental Protection Agency administrator Gina McCarthy seeking answers on why the agency abruptly turned over an investigation into whether the natural gas extraction process called fracking contaminated groundwater in Pavillion, Wyo., to state agencies.

The letter also sought documents regarding two similar cases in Dimock, Pa., and Parker County, Texas. “In all three cases, EPA asserted its jurisdiction to investigate alleged water contamination only to later abandon the investigation and let the states take control,” the Republican lawmakers noted.

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