Fracking does not cause ground water contamination

That's what a University of Texas study claims. The study thinks the contamination is caused by "casing failures or poor cement jobs" or is the result of above-ground spills or mishandling of waste water.  One concern that I have about this study is that is was done by the Energy Institute at the university. It would be nice to know how the Institute is funded. Here are some other views on fracking.