Steel or cast iron pipes will be sacrificial to copper, so they should go first but this failure is very accelerated. This could just be contaminants in the backfill (soil near foundation). This could explain the neighbors' problem. Soil pH would be low and can be tested with soil and a little water and litmus paper from a local chemistry teacher. Not all grounds experience balanced AC and so there may be a DC component, depending on power supplies used in the home. The voltage or current could be checked with a multi-meter or sensitive clamp-on voltmeter. BE CAREFUL -if you disconnect the ground, it could go immediately to HOT if bad wiring is the problem. Realize that the voltage could also be coming from the neighbors through the pipe or from imposed voltage in soils due to cathodic protection circuits on nearby pipelines. Nice puzzle! Good luck. Jim
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