Rainwater harvesting is legal in Tennessee with no state permit or volume limit for non-potable uses like irrigation. Chattanooga actively encourages it, even reimbursing residents for rain barrels and stormwater features. Collected water cannot be used for drinking without treatment.
Tennessee sets no volume limits or permit requirements for capturing and using rainwater, and state law supports green-infrastructure practices including rainwater harvesting. For non-potable uses such as landscape irrigation, rain barrels and cisterns are freely allowed. The one caveat: harvested rainwater cannot be used for potable (drinking) purposes without proper treatment. Locally, the City of Chattanooga reimburses residents for the cost of installing rain barrels and other stormwater-management features as part of its stormwater program. Hamilton County imposes no separate ban. Larger cistern systems tied into plumbing should still meet building/plumbing code, so confirm with the permit office for big installations.
No penalty applies to residential rain barrels for irrigation. Issues arise only if harvested water is plumbed for potable use without treatment, or a large system bypasses plumbing-code review.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
hamilton-county-tn
Chattanooga's curfew bars minors from public streets, parks, and other public places at night. Older teens (17) must be home by 11 p.m. weekdays and midnight...
hamilton-county-tn
Chattanooga zoning limits lighting to one footcandle at any lot line and requires all outdoor luminaires to be shielded so no glare falls on adjacent lots or...
hamilton-county-tn
Chattanooga's zoning code requires all outdoor luminaires to be full cutoff design, caps permitted lighting color temperature at 3200K, and bans searchlights...
hamilton-county-tn
Garage-sale signs in Chattanooga are permit-exempt yard signs. They may be up to 32 square feet, displayed no more than 15 days before and 30 days after the ...
hamilton-county-tn
Chattanooga treats political signs as exempt yard signs needing no permit. They may be up to 32 square feet and 10 feet tall, but all political yard signs mu...
hamilton-county-tn
Chattanooga has no separate tiny-home ordinance; a backyard tiny house is regulated as an accessory dwelling unit. It must sit on a permanent foundation, sta...
See how Hamilton County's rainwater harvesting rules stack up against other locations.
Help us keep this page accurate. If you notice an error or outdated information, let us know.