FILE- In this Nov. 3, 2010 file photo, marchers concerned with water pollution protest against hydraulic fracturing and gas well drilling as they cross the Rachel Carson Bridge on their way through town to the Developing Unconventional Gas (DUG) East convention and exhibition being held in Pittsburgh. Pennsylvania officials say there have been 370 complaints so far in 2013 alleging that oil or natural gas drilling polluted or diminished the flow of water to private water wells. But The Associated Press found that a lack of detail in the data make it almost impossible to judge whether the drilling boom is harming more individuals than in the past, or less. (AP Photo/Keith Srakocic, File)