I have to defer to the EPA on this. See:
In the meantime, be wary of the anti-fracking propaganda. The real action is with the new head of the DOI, Sally Jewell. Jewell (who was celebrated by enviros) is aggressively seeking to expand fracking and oil drilling on public, park, and conservation lands. She is an Obama pick, and former CEO of REI. She used to frack wells and is, in my view, one of the most dangerous leaders in the current administration.
A new study by scientists at Duke Univ. and the U.S. Geological Survey (USGS) found no evidence of groundwater contamination from shale gas production in Arkansas.
“Our results show no discernible impairment of groundwater quality in areas associated with natural gas drilling and hydraulic fracturing in this region,” says Avner Vengosh, professor of geochemistry and water quality at Duke’s Nicholas School of the Environment.
Read more: laboratoryequipment.com
Evidence is piling up against enviros, who really need a long-term strategy. Hit and run activism is failing.