Many of us have probably dreamed about this exact same set up, too.

The one possible drawback to this arrangement is that your entire water supply could be contaminated before you had any warning. Remember Milwaukee and their crypto debacle? Took a while for authorities to notice the higher than expected number of people getting GI problems, then longer to focus on the water supply and finally to test it.

With this continuously re-filling arrangement, all the tanks could be contaminated by the time a warning went out. Or remember that chemical spill into a major river in China that was heading towards Russia? They had warning, but say there was no warning. Again, could contaminate your supply before you knew there was a problem.

That's the only major weakness to this arrangement that I could think of in the past.

Edit: Oh, what I forgot to add yesterday--so one modification I had considered in the past to this kind of water storage arrangement is to add some way to close off or bypass the tanks. Then refresh/refill them only periodically from the municipal supply, and not expose them constantly.

That does remind me of one tidbit I heard mentioned at my CEPA class--after a large earthquake, turn off the water supply to your house.

Two reasons given: 1) Prevents contaminated water (e.g. broken sewer and water mains) from entering your home's water supply. 2) Prevents a drop in pressure in the municipal system, e.g. a water main break down the street, from siphoning the water out of your house's pipes. Although both might apply to your proposed system, benjammin, I'm curious if #2 could happen.

Ha! Wouldn't that really be a shocker--you have all this stored water when the Big One hits, and the morning after the Big One, you find that it all got sucked out of your tanks!