I too had a small pin hole leak in my copper pipe under the slab foundation. I looked up on the net to see what causes it and there is a lot of similar problems. This is one reason why it is now code to place copper above the vapor barrier instead of below it in the dirt. The pipe I had the leak in is also the one that has the plumbing ground to my panel attached to it. The panel is also grounded to two ground rods outside in mostly rocky soil. If it's not electrical current causing it then there is a lot of bad copper out there according to the web. Doug
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