BBC: Drinking water could be contaminated with methane gas and chemicals due to fracking, water companies have warned.
Water UK, which represents all major UK water suppliers, said the shale gas extraction method posed a threat if not "carefully planned and carried out".
It also warned fracking's "huge" use of water could cause shortages in areas of low supply, like South East England.
Shale gas company Cuadrilla said there were no proven cases of aquifers being contaminated by fracking.
Dr...