The problem was complained about in the summer of 2017. There had been a fair amount of rain and we do have a sump pump because of the high water table. However we also tested after a dry period as well. The problem is in the bathroom tub faucet. We do have GFI in both the bathroom and the kitchen but you cannot touch it and either the sink or tub faucet at the same time. More ideas???
Sounds like it’s a matter of tracing your water pipes to see where it is picking up the current from.
Worst case it’s in the ground outside - but that’s unlikely if it is only the one faucet.
Next worse case is some drywall has to be taken down to finish tracing the piping and find the current source.
You can get a lighted scope with an application for a smart phone, if you have one, so you limit the damage by only putting in a small hole.
I’d check the electrical on the sump just to make sure, but I’m leaning against it if it isn’t affecting the other parts of the facility - but maybe the bathroom is closer and the path of least resistance.
Tracing to find the source is the only thing I can think of at this point. Might get a meter out to check the current level. 5V on a metal circuit with minimal resistance likely doesn’t have a high current so in my mind it’s likely a nicked wire. current is coming from somewhere.