Yes, rainwater collection is legal in South Carolina, but subject to state and local water rights laws. Residents may collect rainwater for non-potable uses without permits, though commercial or large-scale systems may require compliance with the South Carolina Department of Health and Environmental Control (DHEC) guidelines. Municipal ordinances, such as those in Charleston or Greenville, may impose additional restrictions on storage capacity or system design.
Key Regulations for Rainwater Collection in South Carolina
- Water Rights Compliance: Collection must not interfere with riparian or prior appropriation rights under S.C. Code § 49-1-10 et seq., particularly in drought-prone regions where surface water diversion is restricted.
- DHEC Non-Potable Standards: Systems intended for drinking require DHEC approval under Regulation 61-58 (Public Water Systems), mandating filtration and disinfection protocols.
- Local Ordinances: Municipalities like Columbia and Mount Pleasant enforce zoning codes limiting tank size (typically ≤ 5,000 gallons) and prohibiting connections to potable water supplies without backflow prevention devices.
Recent 2026 legislative shifts under H.4579 propose expanded incentives for residential rainwater harvesting, including tax credits for systems meeting DHEC’s 2025 updated technical standards. However, commercial entities must secure permits from the South Carolina Department of Natural Resources (SCDNR) for systems exceeding 10,000 gallons, aligning with the state’s 2024 Water Supply Plan prioritizing conservation. Always verify county-specific rules, as enforcement varies.