this post was submitted on 17 Jul 2023
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There is no maximum here. I think thats a US thing.
Maybe some specific state, county or city, but definitely not a general rule in the US.
Most of the Western USA has some form of ordinance for it, but it applies to other arid parts of the world as well.
I've only ever lived in Oregon and Washington, in both those states its legal if you are just doing it off existing rooftops and using it on your property. I think, in both those states you could run into issues (or at least need a permit and water rights) if you build a system specifically for catching water.
I think Colorado is the only state with the 110gal rule.