There was a news report of a similar incident in PA, too. Did you read the comments following the article? One knowledgeable person stated that a test can link whether the gas in the water is the same from drilled well. Wonder who someone would need to talk to to get something like that done?
This is but one of the possible problems that can arise, another includes contamination from frac water disposal, then there's the drop in the aquifer levels as water is used for drilling.
I remember a place in Indiana they had to put some kind of device on water tanks to vent gas. I saw the plumber light the kitchen faucet! That was just natural. There were no gas wells drilled anywhere in the area.