Residents of Pavilion, Wy., began complaining about drinking water that smelled like chemicals back in 2008. Intensive drilling for natural gas in the area began in the late 1990’s and continued until 2006. The area now has 169 natural gas wells.
The draft report says investigators have found compounds in Pavilion’s groundwater associated with fracking. The EPA found high concentrations of benzene, xylene, gasoline and diesel fuel in shallow groundwater supplies that they linked to wastewater pits. But the report also found a number of fracking chemicals in much deeper fresh water wells.
“Alternative explanations were carefully considered to explain individual sets of data. However, when considered together with other lines of evidence, the data indicates likely impact to ground water that can be explained by hydraulic fracturing.”
Hydraulic fracturing is a method to extract oil and gas from underground deposits. It uses a mixture of sand, water and chemicals to fracture shale rock and release the gas. The EPA draft report found chloride, isopropanol, diethylene glycol, triethylene glycol, and tert–butyl alcohol in the deeper test wells. The report indicates the difficulty tracking the chemicals because the gas industry is not required to reveal all chemical elements.