Residents in parts of Pennsylvania are confronting the danger that chemicals associated with fracking have seeped into drinking water.
A report published in an academic journal reported that an analysis of drinking water sampled from three homes in the state’s Bradford County, had found traces of chemicals commonly found in Marcellus Shale drilling fluids.
“Natural gas and other contaminants migrated laterally through kilometres of rock at shallow to intermediate depths, impacting an aquifer used as a potable water source,” said a report published this week by Proceedings of the National Academy of Sciences.
“More such incidents must be analysed and data released publicly so that similar problems can be avoided through use of better management practices.”
Campaigners in Pennsylvania said they were not surprised by the news and that they had been seeking to draw attention to the issues for the best part of a decade.
"We have a book of stories from people who have got sick. We have sold and used the money to buy drinking water," activist John Detwiler of the Marcellus Protest told The Independent.
"The industry has done everything it can to deny this."
The New York Times said the study, relating to the Marcellus Shale gas development in the north of the state, addresses a longstanding question about potential risks to underground drinking water from the drilling technique known as hydraulic fracturing, or fracking.
The paper said the report's lead author, Susan Brantley, Professor of Geosciences at Pennsylvania State University, believed that the contaminants came from either a documented surface tank leak in 2009 or poor drilling.
The nearby gas wells, which were established in 2009, were constructed with a protective intermediate casing of steel and cement from the surface down to almost 1,000 feet. But the wells below that depth lacked the protective casing, and were potentially at greater risk of leaking their contents into the surrounding rock layers, it reported.
Dr Brantley said her wish was to better inform public debate and said that there was very little public data available relating to contminations. She said people could then try and make decisions about the need for securing energy supplies with the potential dangers.
"Society has to decide what degree of problem it is willing to accept," she said.
Independent News Service