The first exploratory well is drilled within the Marcellus shale.
Energy Policy Act (EPACT) excludes hydraulic fracturing as an underground injection;
hydraulic fracturing still not regulated by the EPA.
Marcellus shale natural gas output reaches 1 billion cubic feet a day.
Eagle Ford Shale discovery begins.
The House Appropriations Committee request additional studies from the EPA.
EPA draft report notes water contamination in Pavillion, WY, finding methane, benzene,
and other organic compounds; however, these wells are unusually shallow and cannot
be generalized to all fracking wells.