Collecting rooftop rainwater is legal across Champaign County. Illinois places no meaningful limit on residential rain barrels and cisterns for garden use, and rain barrels are common in Urbana and Champaign. Systems plumbed indoors must meet the Illinois Plumbing Code.
Illinois is a rain-fed, humid-continental state with no water-rights barrier to catching what falls on your roof. Champaign County residents may set rain barrels and cisterns under downspouts for lawn and garden use without special permission, and local sustainability programs have promoted them. The Illinois Plumbing Code governs any system connected to a building's interior plumbing or intended for potable use, requiring proper backflow protection and design. Larger cisterns may trigger a building permit. Overflow should be directed so it does not pool against a foundation or flood a neighbor. HOA covenants may restrict visible barrel placement.
None for a standard rain barrel on garden use. A large cistern or an indoor-plumbed system installed without the required building or plumbing permit is an ordinary code violation subject to correction and fees.
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See how Champaign County's rainwater harvesting rules stack up against other locations.
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