Ada County has no ordinance banning rooftop rainwater collection. Under Idaho water law, capturing rain and snowmelt from your own roof for use on your property is generally allowed without a water right; diverting natural waterways is not.
The county code contains no restriction on residential rain barrels or cisterns. Idaho treats water as a public resource under prior-appropriation law, but the state and the Idaho Department of Water Resources recognize that collecting precipitation from rooftops and other impervious surfaces for on-site use does not require a water right. What is regulated is diverting or storing water from a stream, creek, canal, ditch or the ground; that needs a permit or existing right. So residents may use rain barrels off downspouts, but should not tap irrigation ditches or natural channels without authorization.
No county penalty for roof-runoff collection; unauthorized diversion from a stream, ditch or aquifer can violate Idaho water-right law enforced by IDWR.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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Ada County parks are day-use only and close at sunset. Overnight camping and parking is prohibited on any Ada County owned or leased park property except whe...
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Ada County limits light spilling onto neighbors. In commercial or industrial settings, the effective zone of light from bright fixtures may not trespass onto...
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Ada County's outdoor-lighting standards regulate glare and up-lighting to protect nighttime skies. Fixtures over 260 lumens must have an opaque top to preven...
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Garage-sale signs fall under Ada County's content-neutral temporary-sign rules. No permit is needed: residential lots may have up to six temporary signs, eac...
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Ada County's sign code is content-neutral, so it does not single out political signs. Temporary signs, including yard signs, are allowed without a permit: in...
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Ada County's zoning code treats a tiny home as a manufactured home. A tiny home used as a second unit must meet the secondary-dwelling standards of Section 8...
See how Ada County's rainwater harvesting rules stack up against other locations.
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