I know there's fracking in the area and this report could indicate another factor in the problem. Fracking does contaminate groundwater plus it releases Methane.

Most scientists have long maintained it was highly unlikely that chemicals pumped into the ground for fracking gas could move all the way up through bedrock and into the water table. But that appears to be exactly what has happened underneath Pavilion, Wyoming, population 213.

Last week, the Environmental Protection Agency announced new USGS test results were consistent with its December tests that fracking likely contaminated groundwater there.

detection of synthetic chemicals, like glycols and alcohols consistent with gas production and hydraulic fracturing fluids, benzene concentrations well above Safe Drinking Water Act standards and high methane levels.

[link to tvnewslies.org]