Fracking is a cheap source of energy.

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From the Springer link:

Third, academic research over the last four years suggests that water quality concerns associated with fracking may be more serious than water quantity concerns. The literature has identified more definitive links between shale gas development and impacts on surface water quality, and emerging research is consistent with groundwater quality impacts. The rapid pace of expansion in the industry suggests that new research aimed at quantifying water quality impacts, characterizing their pathways, and assessing options (for industry and/or policymakers) for their mitigation will have high value

Are these peer reviewed?

Was this article peer reviewed as well?

What were the methodologies?

What are the levels in these water contaminations? How did they isolate the contaminations so as to trace them back to drilling and fracking shale gas?

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Are these peer reviewed?

Was this article peer reviewed as well?

What were the methodologies?

What are the levels in these water contaminations? How did they isolate the contaminations so as to trace them back to drilling and fracking shale gas?

Which brings us to this:

Some evidence suggests that movement of methane from shale gas wells to groundwater wells in overlying aquifers may have occurred in the Marcellus [56–58] and Barnett shale plays [56], but these studies have been controversial and have been challenged as lacking evidence that the methane came from the fractured area. A related study in the Arkansas Fayetteville Shale did not detect evidence in groundwater of stray gas contamination, or contamination by brine [59]. Results from studies observing methane in water wells near shale gas development are consistent with well casing and cementing failures rather than upward migration from the shale formations through fracking itself (or through natural conduits) [56]. The fact that current research points to faulty casing and cementing (rather than fracking, per se) as the likely cause of observed groundwater contamination suggests the need for additional scientific and policy analysis in this area.

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Which brings us to this:

Some evidence suggests that movement of methane from shale gas wells to groundwater wells in overlying aquifers may have occurred in the Marcellus [56–58] and Barnett shale plays [56], but these studies have been controversial and have been challenged as lacking evidence that the methane came from the fractured area. A related study in the Arkansas Fayetteville Shale did not detect evidence in groundwater of stray gas contamination, or contamination by brine [59]. Results from studies observing methane in water wells near shale gas development are consistent with well casing and cementing failures rather than upward migration from the shale formations through fracking itself (or through natural conduits) [56]. The fact that current research points to faulty casing and cementing (rather than fracking, per se) as the likely cause of observed groundwater contamination suggests the need for additional scientific and policy analysis in this area.

So, the casings and cenent failed.

Not unique to fracking shale gas. Conventional oil drilling suffers from this as well.

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So tsikoters:

"Common sense" is not very common sometimes because the truth can sometimes be counter-intuitive.