The federal government has returned to a Pennsylvania village that became a flashpoint in the national debate over fracking to investigate ongoing complaints about the quality of the drinking water.
Government scientists are collecting water samples this week from about 25 homes in Dimock, a tiny crossroads about 150 miles north of Philadelphia.
Dimock was the scene of the most highly publicized case of methane contamination to emerge from the early days of Pennsylvania's natural-gas drilling boom. The town was featured in the Emmy-winning 2010 documentary "Gasland."
The Agency for Toxic Substances and Disease Registry told The Associated Press on Thursday that residents are still concerned that gas drilling is affecting their wells. The agency says it's testing the water for bacteria, gases and chemicals.