From the information in the letter, I'm going to assume the homes are in a development. And that they were all built about the same time, and the water/septics were installed by the same plumbing company. Therefore I would question the quality and condition of the water pipe at time of installation and what materials were used to backfill the trench.
Limestone as well as other highly aciditic soils will corrode copper.
Another point to think about is the quality of the water. There is a development that went up around here and the acid levels were so high in the water that the water started corroding the copper pipes after 6 months. The water association would not accept fault, and many homeowners had to have their homes replumbed at their own expenses.
Jean
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