Where can I buy buildable land with water?
In Arizona, water decides whether a parcel is buildable, and it is the question to answer before you buy. Land may be served by a city or private water provider, have a working well, be able to have a new one drilled, or depend on water hauled in by truck.
Arizona regulates groundwater by area. The Arizona Department of Water Resources lists eight Active Management Areas: Phoenix, Pinal, Tucson, Prescott, Santa Cruz, Douglas, Willcox and Ranegras Plain. Inside one, a new subdivision needs a certificate of assured water supply, a 100-year supply, or service from a designated water provider (A.R.S. § 45-576); since June 2023 the state has not approved new groundwater-based assured water supply determinations in the Phoenix AMA. Outside the AMAs, the subdivider must have the supply judged adequate or inadequate, and an inadequate supply has to be disclosed.
Those programs apply to subdivisions, which in Arizona means six or more lots. A rural parcel from a lot split of five or fewer is not a subdivision, so it comes with no water determination at all: confirm the well, the provider or the hauling, and the legal access, before you buy. A household well with a pump of 35 gallons a minute or less is an exempt well (A.R.S. § 45-454), and outside an AMA a notice of intention to drill is filed with the department before any well is drilled.
Arizona State Trust land is another route to a parcel: it is sold only at public auction, after an appraisal and at least ten weeks of published notice (A.R.S. §§ 37-236 and 37-237). On tribal trust land the tribal government has jurisdiction, not the state or the county. If your parcel is on or next to tribal land, say so in the survey and we start there.