Restrictions are mainly on commercial and especially agricultural use. It's not that bad for residential systems. https://www.worldwaterreserve.com/rainwater-ha

Restrictions are mainly on commercial and especially agricultural use. It's not that bad for residential systems. https://www.worldwaterreserve.com/rainwater-harvesting/is-it-illegal-to-collect-rainwater/ https://www.worldwaterreserve.com/rainwater-harvesting/is-it... But in Georgia, you can only use the rainwater outdoors. So you can't legally flush your toilet with it.