Update: University of Minnesota Researchers have developed methods to reduce contamination of the water used in fracking. According to a MN Daily article researchers are using natural soil bacteria in porous silicon beads to seperate out the chemicals from the water. They are working on ways to scale up the operation to use on water filtration systems on site.
As a teenager, I recall being on a dairy farm where the methane from the feedlot entered the drinking water for the family. They were able to light the surface of the water on fire with a match. This is very dangerous and I would not suggest that anyone do this. It points out the need for careful design of both feedlots and fracking operations to prevent ground water contamination.
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