I live in western PA. I follow this issue closely. I care about my and my families health.
Your article simple says there are reports of pollution. Pollution != polluting the water table. All fossil fuel extraction creates pollution.
Hundreds of studies of been done, both public and private about fracking's risk of getting close to the water table. It's never proven to be true. The only study that suggests its possible is the Duke study, but it doesn't prove that it has happened.
This is a hot button issue around here. The water is monitored closely, there are no fracking chemicals showing up in the water tables.
http://www.usatoday.com/story/money/business/2014/01/05/some...
That's the first hit on a google search.