I would like to retract what I said earlier. I looked at it again from the outside, and I see now the water heater sits in like a plastic tub, and any water coming in through the vent can't get inside. It looks like it is installed well, and I don't see any holes, or bad caulking. I am now thinking maybe the furnace door (which is right next to it). Again, I don't see anything noticeable, but feel it is more of a possibility. I don't believe its a leaking water heater, as the ONLY time it leaks, is when it rains, and we don't have the awning out. Its driving me crazy trying to figure out where this is coming from. Again, only when it rains...
I appreciate all of the suggestions too!