South Fulton, GA Landscaping Rules: Rainwater Harvesting (2026)

South Fulton has no local ordinance prohibiting or limiting rainwater collection, so the applicable rules come from Georgia. The Georgia State Minimum Standard Plumbing Code (based on the International Plumbing Code, Chapter 15 - Rainwater Harvesting Systems) sets the materials, design, construction, and installation standards for harvested-rainwater systems and authorizes non-potable uses including landscape irrigation, vehicle washing, livestock and wildlife watering, cooling towers, and toilet flushing. Importantly, the code provides that nothing in that chapter shall be construed to restrict the use of rainwater for outdoor irrigation - so a homeowner installing rain barrels or a cistern to water gardens and lawns faces no state restriction on that outdoor use. Harvested rainwater may not be used for potable (drinking) purposes under the code. Systems that connect to indoor plumbing, supply toilets, or tie into the potable system require code-compliant design and a plumbing permit; simple stand-alone rain barrels feeding a garden generally do not implicate the plumbing code. Captured rainwater can also help residents irrigate within Georgia's outdoor watering schedule. Confirm permit requirements for any plumbed system with the City of South Fulton building/permitting office before installation.