In an Oct. 9 article, E&E Publishing reported that "Oil and gas companies will soon have to start telling U.S. EPA before they 'frack' wells, a development that has caught many in the industry off-guard and rekindled some drillers' most potent fears about federal intrusion."

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by Abrahm Lustgarten ProPublica, July 9, 2012, 3 p.m.

New research has concluded that salty, mineral-rich fluids deep beneath Pennsylvania's natural gas fields are likely seeping upward thousands of feet into drinking water supplies.

Though the fluids were natural and not the byproduct of drilling or hydraulic fracturing, the finding further stokes the red-hot controversy over fracking in the Marcellus Shale, suggesting that drilling waste and chemicals could migrate in ways previously thought to be impossible.