Memphis, TN Landscaping Rules: Rainwater Harvesting (2026)

Tennessee law encourages rainwater harvesting and does not restrict collection on private property. Memphis allows rain barrels, cisterns, and aggregated systems without a capacity cap for outdoor landscape irrigation. Residential installations under 2,500 gallons typically do not require a building permit, though structural supports for larger tanks and any plumbing connection to the house require permits. Indoor potable use (drinking, bathing, toilet flushing integrated with household plumbing) requires plan review and approval by the Shelby County Health Department and must include backflow prevention, first-flush diversion, filtration, and disinfection. Rainwater is not subject to MLGW metering. Humid Memphis climate produces steady rainfall year-round, making 2-inch monthly collection events reliable. UV exposure and mosquito control (sealed overflow screens, lids) are essential. HOAs in Memphis generally cannot prohibit unobtrusive rain barrels, but may regulate screening and placement. Large cisterns may need foundation inspection due to 8-lb-per-gallon loading.