Rainwater harvesting is fully legal in Rankin County. Mississippi places no state restriction on collection. Rain barrels need no permit; large cisterns with cross-connection to plumbing require backflow preventers.
Mississippi has no law limiting private rainwater collection, and Rankin County has no ordinance restricting rain barrels or cisterns. MDEQ's nonpoint source program actively promotes rainwater harvesting to reduce runoff into the Pearl River and Ross Barnett Reservoir watershed. Typical 55-gallon rain barrels at single-family homes in Brandon, Pearl, Flowood, and Richland need no permit. Cisterns over 5,000 gallons or any system that cross-connects to domestic plumbing require International Plumbing Code permit review and a reduced-pressure backflow preventer (RPZ) tested annually. HOAs in Castlewoods, Bridgewater, Lake Caroline, Dogwood Lakes, and Reservoir-area planned communities may restrict visible rain barrels under architectural covenants. Water from the Reservoir intake serves much of the county via Bear Creek Water Association and city systems, so harvested rainwater for outdoor irrigation reduces treated-water demand.
No penalties for standard residential rain barrels. Unpermitted cross-connection to plumbing without backflow preventer: plumbing code violation $100 to $500 plus mandatory disconnection. HOA violations handled privately through covenant enforcement.
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See how Flowood's rainwater harvesting rules stack up against other locations.
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