Yes, rainwater collection is legal in Wisconsin, but municipalities and counties may impose restrictions under state water rights frameworks. The Wisconsin Department of Natural Resources (DNR) permits non-potable uses, while potable systems face health department scrutiny. Recent 2026 guidance emphasizes compliance with local stormwater ordinances to prevent unauthorized diversions.
Key Regulations for Rainwater Collection in Wisconsin
- DNR Permitting for Large Systems: Systems exceeding 10,000 gallons require DNR approval under ch. NR 113, Wis. Adm. Code, to ensure compliance with water rights and groundwater protections.
- Local Stormwater Ordinances: Municipalities like Madison and Milwaukee enforce stormwater management rules (e.g., ch. 28, Madison General Ordinances) limiting roof runoff collection to prevent flooding or contamination.
- Health Department Oversight for Potable Use: The Wisconsin Division of Public Health mandates treatment standards (e.g., filtration, disinfection) for potable systems under ch. DHS 157, aligning with Safe Drinking Water Act equivalents.
Additional constraints apply to commercial or agricultural systems, where DNR may require erosion control plans or water balance assessments. Always verify with local zoning boards, as rural counties like Waukesha impose stricter limits to protect aquifer recharge zones. Failure to comply risks fines under ch. 283, Wis. Stat., particularly if collection disrupts natural hydrological flows.