Arizona Revised Statutes Section 3-111 protects established farm and ranch operations from nuisance lawsuits arising from changed conditions, including suburban encroachment in Maricopa County. Operations existing before nearby development are presumed reasonable and lawful.
ARS Section 3-111 declares that no agricultural operation is or becomes a nuisance, public or private, due to changed conditions in or about the locality if the operation has existed for at least one year and was not a nuisance when it began. The statute covers crop dust, odors from dairies and feedlots, equipment noise, and night-time harvesting. Maricopa County also retains agricultural and rural zoning districts under the Maricopa County Zoning Ordinance, where typical farm activities are by-right. New residents in proximity to agricultural areas (e.g., Buckeye, Tonopah, Aguila, southwest Valley) take title with notice. Violations of zoning or environmental rules (water, air permits) remain separately enforceable.
Nuisance suits against protected agricultural operations may be dismissed early with attorney-fee shifting to the unsuccessful plaintiff under ARS 3-111(C). Underlying environmental violations (MCAQD dust permits, ADEQ water permits) are enforced independently with fines up to $10,000 daily.
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