From the information presented it points towards an electrolis problem which could be caused by a local pipeline that has cathodic protection and is causing a current flow in the earth. If this is cause the copper pipe will be eroded on one side only i.e. the leaks on one side of the tubing which is caused by the copper being plated on one side the removed from the other side.
If the house has improper grounding system and is using the copper pipe, the an insulating section needs to be installed in the copper line before it enters the house. This will cause the currents to flow to the ground rod at the meter entrance.
A test can be made by disconnecting the copper water pipe from the house and connecting a meter to read the voltage between the house and copper tube. Next take a current reading. The data obtain from the readings can be used to better refine the problem and the solution to resolved the problem.
Hope this sheds some light on the issue.
P.S. Cathodic protection can cause large current flow in the ground and if it is nearby, you can expect it to be flowing in the ground. John D. Rowland Sr. P.E.
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