Leaving aside the risk of seismic activity which is debatable, both of the other “imponderables” such as gas seepage into aquifers and at the wellhead are equally possible from conventional drilling. One wonders, therefore, if the policy should also include a prohibition on conventional drilling, even for water wells?
http://www.irishtimes.com/opinion/letters/stop-the-finger-wagging-about-fracking-1.2894014