Don,
I understand how there are parallel paths here, I just thought that 30% of the return current seems high. But if I really think about it, if the water piping system was in great shape electrically, it could conceivably carry half the neutral load! This seems a bit scary to me! But the only reason I can think of why the current would back up into the house plumbing is a bad connection at the service neutral. Sure maybe 2 amps is acceptable at the GEC, but not at the kitchen sink!
Jon, I did pull the meter and the neutral current dropped to zero on all conductors. That is how I verified the current was from the dwelling in question.
Once the POCO re splices I will have to go from there. Maybe I will have to start looking to see if someone lost a neutral and tagged on to a water pipe to fix it. The whole house is two wire, no grounding conductors.
