How toxic is your mineral water?

Fracking for shale gas and oil leaves the water used in this process polluted and remaining under ground. This water through time will seep into existing aquifiers and under ground water sources where bottled water companies extract drinking water. 

http://www.businessweek.com/news/2013-10-08/shale-drillers-offered-water-cheaper-than-u-dot-k-dot-residents-energy