Yes. Rainwater harvesting is legal and encouraged in South Carolina, including Charleston County, for non-potable outdoor use. There is no county rule against rain barrels or cisterns; the state and local programs actively promote them as stormwater best practices.
South Carolina imposes no restriction on collecting rainwater, and Charleston County sets no ordinance limiting rain barrels or cisterns. The state treats rainwater harvesting as a low-impact development option for stormwater management and pollution control on residential and non-residential structures. The main caveat is statewide: potable (drinking) use of harvested rainwater is not permitted at this time, so captured water should stay limited to irrigation and other outdoor uses. Local programs, including the City of Charleston's Rainproof program and annual rain-barrel sales, actively encourage the practice. Large cisterns tied into plumbing may need standard building/plumbing permits.
No penalties for ordinary rain barrels or cisterns. Using harvested rainwater for drinking is not allowed under state guidance; plumbed systems must meet building-code permitting.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Charleston County's rainwater harvesting rules stack up against other locations.
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