Gauging the effects of hydraulic fracturing on the nation’s drinking water is much like considering whether the glass of the precious stuff is half-full or half-empty. When energy companies employ hydraulic fracturing in search of oil and natural gas they should take care, and most of them do, to avoid contamination of nearby reservoirs of drinking water. But the incoming Trump administration must determine again whether there’s an unacceptable risk to supplies of fresh water.
http://www.washingtontimes.com/news/2016/dec/20/editorial-fracking-and-clean-water/