Rainwater harvesting is legal in Williamson County. Tennessee places no restriction on residential collection, so rain barrels and cisterns for garden and lawn use are fine. Only large systems or potable use trigger permits or treatment.
Collecting rainwater for irrigation and other non-potable household uses is allowed throughout Williamson County. Tennessee has no statute limiting residential rainwater capture, and the county encourages practices that reduce stormwater runoff into the Harpeth River and its tributaries. Standard rain barrels need no permit. Large cisterns tied into plumbing, or any system used for drinking water, must meet building and health-department standards. If you belong to an HOA, check its rules on visible barrel placement before installing. Rain gardens and harvested water pair well with the county's native-planting and stormwater goals.
None for ordinary residential collection. A large cistern installed without a required building or plumbing permit is a standard code violation subject to correction and fees.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Williamson County's rainwater harvesting rules stack up against other locations.
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