Arizona encourages rainwater harvesting and Tempe residents may collect rainwater without a permit. No state or local restrictions on residential collection. Arizona offers a tax credit up to $1,000 for qualifying systems. Tempe's monsoon season provides the best collection opportunities. The city supports rainwater harvesting as part of water conservation.
Rainwater harvesting is fully supported in Tempe and Arizona. No permits are needed for standard residential collection systems. Rain barrels, cisterns, and passive harvesting (landscape berms directing runoff to plants) are all permitted. Arizona offers a tax credit of up to 25% of cost (max $1,000) for qualifying rainwater harvesting systems. Tempe's annual rainfall averages about 8 inches, with the majority falling during monsoon season (July-September). Passive rainwater harvesting through landscape design is particularly effective in Tempe and can significantly supplement irrigation for desert-adapted plants. Large underground cisterns may need building permits for structural components. Systems must not redirect runoff onto neighboring properties. The city participates in regional water conservation education through the Arizona Municipal Water Users Association.
Standard collection systems carry no violation risks. Systems altering drainage to neighbors may need engineering review.
Tempe, AZ
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Tempe, AZ
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Side-by-side rule comparisons with other cities in Maricopa County.
See how other cities in Maricopa County handle rainwater harvesting.
See how Tempe's rainwater harvesting rules stack up against other locations.
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