Hi Have lived in my house for 5 years and have never encountered this problem. Yesterday my daughter turned on the cold water tap in the bathroom to wash her hands, when she put her hands under the running cold water she got a tingle in her hands and up her arms like an electric shock, she then called me and i tried it and got the same, we turned on the bath and again got a shock from the running water. My daughter picked up her flannel (wet) from the bath and got a shock from that too. It appears to be only upstairs, as the shower and sink downstairs are fine. What is this?? Can anyone tell me? thanks in advance