Researchers say there is an error in gas drilling study

PITTSBURGH — Penn State University researchers say there was an error in a study they released in October on natural gas drilling and water wells.

The researchers say that there is far less evidence of well contamination by bromides that could have come from gas drilling or hydraulic fracturing. One water well showed increased bromide levels after drilling, not seven, according to a statement issued last week. Bromides are salty compounds that can combine with other elements to cause health problems.

The researchers are reviewing the entire study after discovering that results from an independent water testing lab contained the error. They say a corrected version of the study, which was published by The Center for Rural Pennsylvania, will be issued in the future.