Marcellus Shale natural-gas production not currently causing widespread hydrocarbon contamination of domestic wells that tap shallow upland groundwater

A new USGS study reports that shale-gas production in northern Pennsylvania has not currently caused widespread hydrocarbon contamination in the upland aquifer zone used for domestic supply. The study focused on groundwater in upland settings—high or hilly land—where natural processes are less likely to contribute methane and […]