Indiana Rainwater Harvesting Law: Statewide Landscaping Rules Rules (2026)

Key Facts

State Permit Required: No, for residential
Plumbing Code: 675 IAC applies
Water Rights: Riparian system
Potable Use: Backflow prevention required

Full Breakdown

Unlike some western states, Indiana follows riparian water rights and does not regulate residential rainwater collection at the state level. Property owners may install rain barrels, cisterns, and rooftop collection systems for non-potable uses such as irrigation. The Indiana Department of Environmental Management does not require permits for collection systems serving single-family residences. Larger commercial systems and any potable-use systems must comply with state plumbing code under 675 IAC. Local jurisdictions may impose setback or aesthetic requirements but cannot prohibit residential rainwater collection outright under general state water policy.

Violations & Penalties

Improperly installed cisterns connected to potable plumbing without backflow prevention violate state plumbing code and may require removal.

Frequently Asked Questions

Do I need a permit to install a rain barrel in Indiana?

No state permit is required for residential rain barrels. Some cities may require setback compliance, but rainwater collection itself is universally permitted.

Can I drink harvested rainwater?

Only with state-approved treatment and backflow prevention meeting Indiana plumbing code (675 IAC). Non-potable uses like irrigation require no special approval.

Indiana Rainwater Harvesting Allowed Without State Permit