The finding is based on a three-year study of groundwater contamination near the town of Pavillion.
The deep water well monitoring study found that synthetic chemicals, such as glycols and alcohols consistent with gas production had been detected as well as hydraulic fracturing fluids, including highly noxious benzene concentrations well above Safe Drinking Water Act standards. The study also reported high methane levels.
The EPA said in the report that it is "concerned about the movement of contaminants within the aquifer and the safety of drinking water wells over time.' "
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