WHILE I understand the concerns of P Davidson (Letters, March 11), I wonder if your correspondent’s worries about pollution of our water supplies are overstated.

Perhaps Scottish Water could indicate the proportion of our domestic supplies obtained from wells vulnerable to fracking as opposed to rural run-off into reservoirs?

Given our hills and climate I would expect the latter to be the main source of water supply.

MCB McGregor,

17 Greenpark, Edinburgh.