Yale University researchers analyzed groundwater from 64 wells in several fracking-dense Pennsylvania counties where Marcellus shale drilling is taking place. In the largest study of its kind they found no association between fracking and well water contamination.
groundwater
Another junk study attempts to scare the public about putative dangers of fracking. Despite the complete lack of scientific rigor involved in its conception and evaluation, the scaremongering got plenty of media attention which is the point of such an inexcusable violation of the scientific method.