We reported previously on a study done by Penn State researchers reporting that "[t]ests of water wells near gas drilling sites generally didn't find detrimental changes in water quality." See here. The WSJ is reporting that the researchers found an error in the report resulting in "far less evidence of well contamination by bromides, salty mineral compounds that can combine with other elements to cause health problems, than first suggested." (Emphasis is ours.) (The error stemmed from an independent lab analysis.)