Yes, rainwater collection is legal in Maine, but subject to municipal and state water rights laws. Homeowners may collect rainwater for non-potable uses without permits, though commercial or large-scale systems may require approval from the Maine Department of Environmental Protection (DEP) or local water utilities.
Key Regulations for Rainwater Collection in Maine
- Non-Potable Use Only: Maine does not regulate small-scale rainwater harvesting for non-drinking purposes (e.g., irrigation, toilet flushing), but systems must not contaminate groundwater or surface water. The DEP’s Stormwater Management Manual (2023) discourages unmanaged runoff from storage tanks.
- Potable Water Restrictions: Harvesting rainwater for drinking is not prohibited but must comply with the Safe Drinking Water Act and local plumbing codes. The Maine Center for Disease Control (2024) warns against untreated rainwater due to microbial and chemical risks.
- Commercial/Industrial Scaling: Entities collecting >1,000 gallons annually or selling water must obtain a DEP Water Use License under Title 38 MRSA §410. Municipalities like Portland (2025 ordinance) impose additional fees for commercial systems exceeding 500 gallons.
Recent shifts include the 2026 DEP draft rule on Alternative Water Sources, which may streamline permits for residential systems but tighten oversight for agricultural or industrial use. Always verify with local plumbing inspectors and the DEP’s Water Resources Program before installation.