Drilling for natural gas caused “significant damage” to drinking-water aquifers in a Pennsylvania town at the center of a fight over the safety of hydraulic fracturing, according to a report prepared by a federal official, reports The Washington Post.

The previously unreleased document from an employee at the Environmental Protection Agency’s regional office found that drilling or fracking, in which water, sand and chemicals are shot underground to free trapped gas, caused methane to leak into domestic water wells in Dimock, Pa., reports Mark Drajem in The Post. The findings contradict Cabot Oil and Gas Corp., which drilled in the town and said the explosive methane gas was naturally occurring, notes The Post.

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