I would like to find out if all three houses had their water service installed on the same day(s) by the same plumber using the same copper pipe. Seems to me if this is the case, the finger points at a bad run of copper pipe. The pipe manufacturer should stand by their warranty.
If the the copper pipe was installed at different times by different plumbers, then there is another problem. Maybe something with the soil. I have been told copper will develop pin holes if it is buried with no water flow, however, that is not the case here.
Is there something in the soil attacking the copper pipe?
Maybe the power company has a bad neutral.
Check the current on the water pipe with a clamp on. Tim
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