A recently released study on natural gas drilling and contamination of water wells, contentious issues as drillers swarm to a lucrative shale formation beneath Pennsylvania, had an error, according to researchers from Penn State University.

The researchers reported that there is far less evidence of well contamination by bromides, salty mineral compounds that can combine with other elements to cause health problems, than first suggested. The researchers are reviewing the entire study, released in October, after discovering that results from an independent water testing lab contained the error.

One water well, not seven, showed increased bromide levels after drilling, the researchers said in a statement issued last week by The Center for Rural Pennsylvania, a state-funded agency that first released the study.

One of the Penn State University researchers, Bryan Swistock, said in an email that the study didn’t go through an independent scientific peer review process because of a Center for Rural Pennsylvania policy that reports must first go to the General Assembly before outside publication.

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