Which supply rule reaches this ground

The question a buyer of raw Arizona land is really asking is not "is there water" but "can lots here be sold". Those are different questions with different answers, and the second is settled by a state determination that attaches to the subdivision rather than to the aquifer.

Roughly half the registered wells in the state sit inside an Active Management Area. Which half a parcel is in is the first thing worth knowing about it, and the boundary does not follow county lines, municipal limits or anything else visible from the road.

Inside an Active Management Area

In an AMA, a subdivider cannot sell lots without a determination from the Department of Water Resources that the supply is assured: physically available, legally available and continuously available for a hundred years, of adequate quality, and consistent with the management goal of the area.

A subdivision in an active management area may not be offered for sale unless the director has determined that an assured water supply exists, or the land is served by a city, town or private water company that itself holds a designation of assured water supply.

A.R.S. 45-576

That is a hundred-year test, applied by the state, on paper, before anything is sold. It is the hardest gate in Arizona land, and it is the reason two parcels with identical geology can be worth very different money.

Outside a management area

Outside an AMA the state still makes a determination, but in most places it is advisory: the developer must disclose whether the supply was found adequate, and a finding of inadequate supply does not by itself stop the sale unless the county has adopted the mandatory rule. Some have and some have not, and the state publishes no list of which, so it is a question for the county planning department by name. The report tells you which county you are in and which determinations are on record; whether that county made the finding binding is the one part of this you have to ask a person.

Irrigation non-expansion areas

There is a third regime between the two. An INA is lighter than an AMA and does one hard thing: only acres with a qualifying history of irrigation may be irrigated with groundwater. The history is a defined statutory window rather than whatever happened to be growing when the area was designated, so land that looks farmable and has never been farmed can be permanently unfarmable with groundwater.

The replenishment obligation

A common way a subdivision inside an AMA reaches assured status is by enrolling in the Central Arizona Groundwater Replenishment District, which replenishes on the member land’s behalf. That solves the determination and creates a recurring charge on the parcel which rises with the cost of replacement supply. It runs with the land, and it compounds. It is also close to invisible in a listing.

What the report does with this

• Whether the land is inside an AMA, an INA, or outside all of them, and which one
• Assured and adequate supply determinations on record at or near the parcel, by file number
• Whether the ground is enrolled member land for replenishment purposes
• Where a section straddles a management boundary, so the answer differs across it
• Which service area, if any, covers the parcel, and what that provider is

A determination near a parcel is not a determination on it, and the report says which it found. That distinction is the whole value of the item, and it is the one a listing is most likely to blur.

This is general information about Arizona law and records. It is not legal advice and not a title opinion. What applies to a particular piece of ground is settled by the documents filed against it.