More than three years into the gas-drilling boom that’s produced thousands of new wells, the U.S. Environmental Protection Agency and the state of Pennsylvania are tussling over regulation of the Marcellus Shale, the vast underground rock formation that holds trillions of cubic feet of gas. The state says EPA is meddling. EPA says it is doing its job. Kim Grosso, who lives near a pair of gas wells drilled in 2008, told federal officials her water became discolored a few months ago, with an intermittent foul odor and taste. “If there is something wrong with the water, who is responsible?” she asked. “Who’s going to fix it, and what does it do to the value of the property?”

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