Had a customer recently who had electromagnetic field's in the house but only in one spot on the floor. I know we had some current coming in on the water line so I told her to get the plumber to dig up by the meter and replace the first 2 feet or so with plastic. This way I still had an electrode.
That helped but she still has a bit coming in somewhere. We disconnected the entire house, pulled the meter, and there was still some current on the neutral which was still connected. When we disconnected the neutral it went away. There isn't much I can do about that.
P.S. What I said about 3 amps was an arbitrary load...Just making a point that there should be some but not alot of current
Could be a broken MGN on the pole?