Researchers at the University of Texas at Arlington say there are elevated levels of arsenic and other heavy metals close to natural gas extraction sites in the Barnett Shale area of North Texas, according to a news release from the school Friday.
Several scenarios — including disturbances from fracking, lower water tables from drought, removal of water used for fracking or industrial accidents such as faulty gas well casings — could release the dangerous compounds into shallow groundwater.
"This study alone can't conclusively identify the exact causes of elevated levels of contaminants in areas near natural gas drilling, but it does provide a powerful argument for continued research," Brian Fontenot, the lead author on the new paper, said.
Arsenic, barium, strontium and selenium occur naturally at low levels in groundwater. But the release says fracking activities could elevate their levels.