Stray Voltage
When I was doing my research to find the issue, there are two ways to get electricity into the water. The first is through some type of faulty wiring or installation, a dead short to the water, which would be prevented by the GFI or breaker. The second is where there are stray voltages caused by inbalanced electrical grids, faulty transformers, ect, basically caused by anything before your meter. These stray voltages are not very high and are not just found in the water, but in rare cases they can be enough to cause injury or death. The electrical grid in this country is in pretty good shape, so cases are rare.
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