I agree with Mr. Holt. The concern needs to be with any DC electrical charge on the pipes.
It would be helpful to know the age of all the homes in the area. Do the some of the homes in the area utilize pvc piping to the house?
The most likely causes of this are the already mentioned possible manufacturing problems in the pipe. The other possible cause is a soil problem. A collection of soil samples should be taken to determine if there is a corrosion problem between the soil and copper pipe. I have documented a few corrosion problems in the past for insurance companies. Tony
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