A natural gas well is drilled near Canton, in Bradford County, Pennsylvania (Reuters/Les Stone)
The three homes, located in Bradford County, Pa., revealed traces of a compound commonly found in Marcellus Shale drilling fluids.
"These findings are important because we show that chemicals traveled from shale gas wells more than 2 kilometers (1.25 miles) in the subsurface to drinking water wells," said study co-author Susan Brantley, a geoscientist from Pennsylvania State University.
Brantley added that this is the first published case in which a homeowner's well has shown organic compounds attributed to shale gas development.
The water at one house was shown to contain 2-Butoxyethanol (2BE), a common drilling chemical which is also used in paint and cosmetics. The authors noted, however, that the amount of 2BE found was within safety regulations and did not pose a health risk.
The chemical has been shown to cause tumors in rodents, though it remains unknown whether those carcinogenic properties also affect humans.
However, the authors say they do not claim the chemicals came from fracking.
Meanwhile, Brantley said the chemicals almost certainly did not come from the Marcellus – a rock formation more than a mile underground – after fracking. The water did not contain a high level of salt, which is a signature characteristic of fracking wastewater.
Instead, the researchers said the fluid likely escaped while crews were first drilling the nearby gas well. A less likely possibility is that it came from a documented surface tank leak in 2009.
“I really don’t care if it’s fracking or if it’s just drilling fluid – if it’s hazardous, it’s hazardous to your health,” Llewellyn said. “That’s really what we’re trying to emphasize and make sure the general public understands – to stop thinking just about hydraulic fracturing and more about the overall process of oil and gas development.”
He added that when his team sampled water wells that were farther away from the drilling sites, they did not find any of the compounds.
The fracking industry has long insisted that drilling chemicals pose no risk because hydraulic fracturing occurs thousands of feet below drinking water aquifers. It has criticized the new study, saying that it provides no proof that the chemicals came from a nearby well.
Katie Brown, an energy consultant with Energy in Depth – an advocacy group for the Petroleum Association of America – said the authors have no evidence that the traces of 2BE came from a drilling site.
“The entire case is based around the detection of an exceedingly small amount of a compound that’s commonly used in hundreds of household products,” she told The New York Times in an email. “The researchers suggest the compound is also found in a specific drilling fluid, but then tell us they have no evidence that this fluid was used at the well site.”
Fracking consists of blasting fissures in rocks thousands of meters under the earth with water and sand to release trapped deposits of oil and gas.
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