Quick Answer
Rainwater collection is allowed in Michigan for non-potable uses like irrigation, but check with local authorities for specific regulations and permits required.
Michigan Rainwater Collection Regulations
Michigan allows rainwater collection for non-potable purposes, including irrigation, as long as it does not pose a public health risk. The state Department of Environmental Quality (MDEQ) regulates rainwater collection systems, and homeowners must ensure their systems are designed and installed to prevent contamination. For example, a first flush device should be installed to divert the first flow of water from the roof, which may contain debris and contaminants.
Design and Installation Considerations
When designing and installing a rainwater collection system for irrigation in Michigan, consider the following factors: roof size, gutter and downspout capacity, storage tank size, and distribution system design. A good rule of thumb is to ensure the storage tank has a minimum capacity of 1,000 gallons to provide a 30-day supply of water. It’s also essential to connect the system to a suitable filtration and treatment system to remove sediment and other contaminants that may harm crops or microorganisms in the soil.
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