"We have, for the first time, demonstrated impact to Underground Sources of Drinking Water (USDW) as a result of hydraulic fracturing," says the study published in the journal Environmental Science & Technology.
The researchers also discovered that industry fracked directly into aquifers at depths as shallow as 213 metres with highly toxic chemicals, including benzene.
The new study also found that different companies in Pavillion, Wyoming used acid and hydraulic fracturing treatments at the same depths as water wells in the area. Waste disposal pits contaminated groundwater, too.
The scientists matched chemical compounds used in fracking to chemicals found in two groundwater monitoring wells drilled by the U.S. Environmental Protection Agency in 2008.
A 2014 University of Texas study, for example, looked at 100 water wells in the heavily fracked Barnett Shale and found that approximately 30 per cent of the wells within 2.9 kilometres of gas drilling sites showed an increased amount of arsenic and other heavy metals.
As of 2016 there are over a million fracking wells in the United States. The average fracking well uses 300 tons of toxic chemicals , each well needs 2 million to 4 million gallons of fresh to drill a fracture, that water is then contaminated beyond recovery with toxic chemicals and in itself produces a major pollution problem.
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