Here in Ohio a similar problem came into play. As an electrical inspector I was called out since I did the original inspection. Upon arrival at the site I was shown the leaking copper water line by the plumber and the original electrical contractor was also on hand. All bonds/grounds were removed from the water line so as to get an idea on exactly what was happening. All was clean with the install so I called the electrical utility company to see what might be on their end. One thing we found out was that someone did not properly ground the transformer that was located near the front of the property but I still had reservations as that in and of it self in my opinion would not cause the copper water line to be attacked. Next call went into the soils engineer company that originally did the layout of the development.
The soils engineer brought to our attention that in the plans it was recommended that they use plastic water lines since the soil contained traces of metal compounds that occur naturally in that area and can cause a dissimilar metal reaction with copper. To make a long story short they replaced the water line with plastic. Naturally the 22 other neighbors in the same subdivision demanded that their lines also be replaced. This cost the builder big bucks but it was his fault for not reading the plans.
I would start by calling a qualified electrical contractor and have them test the grounds/bonds of the system. Next contact the utility company and see if anything is wrong on their end. Keep in contact with your neighbors since they are also having problems. Hopefull someone will find the problem and also have a solution. Clete
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