The U.S. government said it found no evidence that shale gas drilling had contaminated water in two Arkansas counties where concerns were raised about the drilling technique called hydraulic fracturing, or fracking.

The U.S. Geological Survey (USGS) sampled 127 shallow domestic wells in Van Buren and Faulkner counties in the Fayetteville Shale area, where 4,000 wells have been drilled since 2004.

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