The EPA stated that one home had arsenic levels 9 times safe levels and that 5 homes had methane levels above the standard Pennsylvania has established for remediation. In the case of the home with high arsenic levels, EPA offered replacement water, but the homeowner declined. The EPA stated it will do more testing at the well. http://thetimes-tribune.com/news/epa-releases-third-set-of-dimock-water-tests-1.1303087.
The EPA stated that it currently had no conclusions to offer whether the methane or arsenic levels were a result of natural causes or drilling. And that is not good enough.
Once the EPA began testing in Dimock, it must do the job fully. It should be doing isotopic analysis of the methane for example, to determine the source of the gas in water, as the Pennsylvania Department of Environmental Protection did in 2009-2010.
Importantly, the latest EPA test results showed no spikes in chloride or any other indication that frack fluids contaminated drinking water.