Based on US Experience EU Advises Fracking Caution

 Report prepared for the European Commission DG Environment with many references from PA and the Marcellus Shale--
Identification of potential risks for the environment and human health arising from hydrocarbons operations involving hydraulic fracturing in Europe 

"Because of the health and environmental risks, the study recommends that fracking should only be allowed under strict conditions, and not yet on an industrial scale.   No fracking should be be allowed in areas where water is being used for drinking purposes."

  http://ec.europa.eu/environment/integration/energy/pdf/fracking%20study.pdf