Yes, rainwater collection is legal in Indiana, provided it complies with state and local water rights laws.
Indiana’s legal framework permits rainwater harvesting under the state’s water rights doctrine, which prioritizes surface and groundwater use. While no statewide ban exists, local jurisdictions—particularly in northern Indiana’s high-water-table regions—may impose restrictions to prevent interference with municipal drainage systems or private property rights. The Indiana Department of Natural Resources (IDNR) has signaled potential 2026 updates to clarify collection limits, emphasizing conservation over extraction. Property owners must avoid diverting runoff that could exacerbate flooding or violate riparian rights.
Key Regulations for Rainwater Collection in Indiana
- Surface Water Diversion Limits: Indiana’s water rights laws (IC 14-25-7) prohibit the capture of rainwater if it reduces downstream flow to navigable waters or violates riparian entitlements. Collection systems must not alter natural drainage patterns.
- Local Ordinance Compliance: Municipalities like Fort Wayne and South Bend enforce stormwater management codes (e.g., Fort Wayne’s Stormwater Management Ordinance) that may require permits for systems exceeding 5,000 gallons or impacting public infrastructure.
- Potable Water Standards: Collected rainwater used for drinking must meet IDNR’s Drinking Water Standards (327 IAC 8-2), mandating filtration and disinfection to prevent contamination risks.