Your "credibility" is linked to a speculative newspaper article? Agenda related, maybe?
From the article you linked..:
... About 90 percent of U.S. wells, and almost all in Colorado, are hydrofractured or fracked by forcing a mixture of water, sand and trace chemicals into a well to crack rock and release oil and gas. Industry executives and state regulators, including Colorado regulators, have said there were no documented cases of fracking directly polluting groundwater....
The EPA study "gives a probability, not a conclusion, said Douglas Hock, a spokesman for Calgary-based Encana Corp., the operator in the Pavillion field.
The origin of the chemicals is still not certain, Hock said....
