There is a remote possibility that the iron content of the soil that the pipe is buried in may be high and the current flowing through the pipe is aggravating the natural electrolysis of the dissimilar metals. It is proven that copper will corrode quickly if it contacts iron, steel, etc. While not an answer, it is something to check into. I am not an authority on this, but have seen this type of damage before. It certainly is something to look into. Especially if other houses in the area are having the same problem. If you can get a section of the pipe, send it to a lab and have the failure analyzed for root cause. Brian Whittington
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