Rainwater harvesting for outdoor irrigation is legal in Dearborn with no state prohibition; indoor potable or non-potable use must comply with Michigan plumbing code and EGLE cross-connection rules.
Michigan law does not restrict collection of rainwater from rooftops, and Dearborn residents are free to install rain barrels and cisterns for garden irrigation, car washing, and general outdoor use. Small rain barrels under 100 gallons do not require permits. Larger cistern systems may require building or plumbing permits especially if plumbed into the structure. Any connection to the household plumbing for toilet flushing, laundry, or other indoor non-potable uses must include a physical backflow preventer or air gap to protect the potable supply as required by the Michigan Plumbing Code. Rainwater is not approved for potable use without treatment meeting safe drinking water standards. Covering collection containers reduces mosquito breeding, which is a public health concern enforced by Wayne County. GLWA and EGLE occasionally offer rain barrel distribution events.
Contact your local code enforcement office for specific penalty information.
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Side-by-side rule comparisons with other cities in Wayne County.
See how other cities in Wayne County handle rainwater harvesting.
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