I talked with my husband this AM,..he is an architect/engineer.
He said as long as your house was grounded during construction, and you haven't had any major changes in your plumbing lines ( metal to PVC), then your house should be grounded. Most cities nowrequire by ordinance,that an 8 foot grounding rod of copper clad steel pipe be driven into the ground. This protects your house. In many older homes, plumbers used to ground the house to water lines and gas lines..gas lines not a good idea. Ground to water lines used to be standard. He said the whole house protector would be a "belt and suspenders" thing. But if you have had metal plumbing replaced by plastic pipe, it would probably be a good idea. Diana in TX