"I am guessing only the electric panel needs a ground rod. A steel pipe water supply is the best ground and ground can be tied to that as well, but grounding concrete or PVC drain will do absolutely nothing."
I would tend to agree that in most places metalic water pipes are a DAMN good ground. But they are no longer acceptable is the "official" gorunding method. For that, it's two ground rods. If you have a water pipe, the ground rods are for show. You bond the water pipe to your ground rod system and that's as good as you can get (just about, anyway ... bonding the a re-bar system in concrete is consider to be quite good also.
Obvious, a PVC pipe can't be a ground.
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