Ariz. Rev. Stat. § 49-766
A. A single family residence located on a farm or ranch of more than forty acres in an unincorporated area may operate on site a landfill for the disposal of solid waste resulting from the residents' household activities. The owner or operator of the farm or ranch shall comply with all of the following:
B. A person engaged in farming or ranching on at least forty acres in an unincorporated area may operate an agricultural landfill on the property for disposal of solid waste, but not hazardous waste, generated on the property. The person shall comply with all of the following: