There are still some restrictions, and a good summary here: https://worldwaterreserve.com/rainwater-harvesting/is-it-illegal-to-collect-rainwater/ https://world

There are still some restrictions, and a good summary here: https://worldwaterreserve.com/rainwater-harvesting/is-it-illegal-to-collect-rainwater/ https://worldwaterreserve.com/rainwater-harvesting/is-it-ill.... When buying property, you may have agreed that you were not acquiring mineral rights, water rights, etc. and you still might have problems even in the absence of a government rule against it. I don't know how legitimate such claims are or how often they're successful, but I know someone who got legal nasty-grams from a land developer for doing it, and the property owner backed off when they saw the papers they had signed again.