Mike Leighton, 68 years, stands next to a water filtration system for his contaminated water well September 10, 2012 at his home in Granville Summit, Pennsylvania. Leighton's water well was contaminated by methane released from a hydrofracked gas well drilled by the Chesapeake Energy in May 2012. Chesapeake supplied Creighton with the water filtration system and delivers drinking water. Methane gas from the fracked well also leaks into Leighton's basement for which Chesapeake provides a vacuum pump. Leighton and his wife built their retirement home on 10-acres of land which sits above the Marcellus Shale gas field. Hydrofracking is a controversial drilling method which pumps millions of gallons of water, sand and chemicals into horizontally drilled wells to stimulate the release of the gas. The Marcellus Shale gas field stretches diagonally across West Virginia, Ohio, Pennsylvania and New York State. Hydrofracking's environmental impact is a politically sensitive issue in a resource dependent state.