Collecting rainwater is legal in Wisconsin and Rock County sets no barrier to rain barrels. There is no state permit for a basic downspout rain barrel used for outdoor, non-potable purposes. Some cities add setup conditions.
Wisconsin has no statute or administrative rule making it illegal to capture rain falling on your own property, and Rock County imposes no county-level ban. Setting a rain barrel under a downspout for outdoor, non-potable use, watering gardens, irrigating your lawn, washing a car, is essentially unregulated and needs no state permit. Restrictions, where they exist, are municipal: some cities require that a system not connect to the public water supply, not feed water inside a building, not be used for drinking, and not use a buried tank. Because rainwater is untreated, it should never be used for drinking. Confirm any local plumbing or setup rules with your city.
No county penalty applies. Municipal plumbing or backflow rules govern connected systems; violations are handled by the local building or plumbing inspector.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
Rock County, WI
Wisconsin's cruelty statute (Ch. 951) makes it illegal to keep animals without proper food, water, and shelter, which is how hoarding is enforced. Rock Count...
Rock County, WI
Rock County has no blanket countywide wildlife-feeding ban, but deer and elk feeding is regulated statewide, and nuisance-feeding of wild animals is addresse...
Rock County, WI
Rock County parks close overnight. State law (Wis. Stat. 27.05) empowers the county to set park rules and penalties, and Rock County Parks posts closing hour...
Rock County, WI
Rock County has no county-wide light-trespass ordinance. Glare or spillover from a neighbor's outdoor lights is generally handled as a private nuisance, or u...
Rock County, WI
Rock County has no general dark-sky lighting ordinance, and neither does the City of Janesville. Outdoor lighting is mainly addressed through zoning conditio...
Rock County, WI
In Rock County, garage-sale signs can't legally go in the street or highway right-of-way. Wis. Stat. 86.19 bars any sign within street limits except traffic ...
See how Rock County's rainwater harvesting rules stack up against other locations.
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