It may be possible that there is small amout of induction on to the copper pipe through the distribution panel in the house. This is possibly causing the pipe to act as an anode such as in a cathodic protection system, Where postive voltage is injected into the ground through an anode bed system and the negitive side would be attached to the metal property being protected. If there is copper pipe in the ground in this case, most likely it is discharging small currents into the electrolysis when it should be retriving postive voltage to polarize the surface of the pipe. Suggest changing the pipe to PVC until it reaches grade or above. Most likely the water pipe should only be grounded at the water heater with a #6 AWG conductor and return path directly to earthing rod at service entrance, Not thru the distribution panel. Mike Edwards
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