Yes, rainwater collection is legal in Maryland, but subject to specific state and local regulations, particularly concerning potable use and structural safety. The Maryland Department of the Environment (MDE) permits non-potable systems under general water rights principles, while counties like Montgomery and Prince George’s impose stricter rules, including mandatory permits for systems over 500 gallons.
Key Regulations for Rainwater Collection in Maryland
- Potable vs. Non-Potable Use: Maryland allows rainwater collection for non-potable purposes (e.g., irrigation, toilet flushing) without permits, but potable systems require MDE approval under the Water Supply Program, aligning with the 2023 Safe Drinking Water Act amendments.
- Structural and Zoning Compliance: Counties enforce building codes (e.g., Montgomery County’s Rainwater Harvesting Guidelines) requiring structural integrity checks and setback distances from property lines to prevent flooding or contamination risks.
- Commercial Systems and 2026 Deadlines: Large-scale commercial systems (>1,000 gallons) must register with the MDE by 2026 under the Water Use Reporting Act, ensuring compliance with consumptive use limits and reporting thresholds.