My sister had the same problem on the copper connector going from the Black plastic water supply to the house and I beleive the water pipe from the street was copper. Because the problem was after the meter it cost her $500.00 for water consuption.
Could it have anything to do with plastic pipe coming from the house and the water is a conductor that is seeking ground outside the connector which is at least 36" under ground?
The connector actually looked like electrolysis occured like on a boat zinc.
This happened about 10 years ago on a new house located in Burlington County South Jersey. Pete
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