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It appears that rainwater collection legality varies by state, and is subject to change. Some users mention that in the past, certain states in the Western U.S. had strict regulations due to established water rights, while others are now encouraging collection. One user specifically mentioned Washington having some kind of law about not being able to collect rainwater, but this may have been appealed. Another user shared an article discussing how Colorado has changed its laws to allow rainwater collection, marking a shift in water rights management.
Here's what our forum users are saying about rainwater collection: