Buying Land in La Paz County, Arizona

A newer county with a workable, if dated, zoning code

La Paz County is Arizona's only county created since statehood -- the state legislature split it off from the northern portion of Yuma County via Senate Bill 1267 in 1983, and it struggled with its tax base as a brand-new government before the legislature made splitting counties considerably harder afterward. Parker, on the Colorado River, has been the county seat from the start. For land-use purposes, the county's Community Development Department (which also handles Building and Safety, Wastewater, and Code Compliance) administers a Zoning Regulations book dated 2012, organized by zone -- Commercial, Industrial, Residential, and Rural Agricultural among them -- with a Planning & Zoning Commission that reviews rezonings, master and comprehensive plan amendments, and can approve preliminary plats.

A distinctive feature of the county's zoning documentation is how directly it's tied to specific, named platted areas along the Colorado River corridor and in the county's agricultural valleys -- Cibola, Cibola West, Cibola South, and Rio Colorado Ranchos near the river, and Wenden, Wenden West, Wenden East, and the Wenden and Bouse townsites inland. If you're evaluating a lot in one of these older platted communities, ask Community Development for the zoning and any subdivision-specific conditions that apply to that particular plat by name, rather than assuming a general rural designation covers it.

McMullen Valley: a basin outside any AMA with worse numbers than some that are inside one

The state hub explains Arizona's Active Management Area system, but McMullen Valley -- the roughly 720-square-mile basin in the county's interior, near Wenden and Salome -- sits outside any AMA. It's not unregulated in every sense, though: Arizona statute specifically names McMullen Valley, along with Butler Valley, the Harquahala Irrigation Non-Expansion Area, and the Big Chino basin in Yavapai County, as one of a handful of basins from which groundwater may legally be transported to an AMA, with ADWR required to write rules governing that transport. That legal pathway is precisely what's made the basin a flashpoint: ADWR's 2023 Supply and Demand Assessment documented the basin's available water supply falling from about 34,600 acre-feet in 1990 to roughly 8,200 acre-feet by 2022, projects that for 2023-2075 the basin will lose about five acre-feet for every one acre-foot that enters it, and has recorded land subsidence of nearly 3.9 feet since 1992 -- a sign of long-term aquifer compaction, not just falling water tables.

That combination -- a badly stressed basin that state law explicitly allows to export water to the Phoenix area -- is what drew Water Asset Management LLC's 2024 purchase of roughly 12,793 acres of farmland and water rights above the basin for about $100 million, widely reported as one of the largest water-related land deals in Arizona history. County Supervisor Holly Irwin and local water officials have publicly described the purchase as a threat to residents' domestic wells, and as of early 2026 a state legislative fight was underway over whether the purchaser should be allowed to sell that water toward metro Phoenix. If you're evaluating land anywhere near the McMullen Valley Basin -- for a well, for agriculture, or simply for long-term value -- treat this as a live, unresolved situation and confirm current legislative and hydrologic status directly with ADWR and county officials rather than relying on any point-in-time description, including this one. This basin decline also has a direct, practical consequence for anyone platting new lots nearby -- see this site's dedicated page on subdividing land in La Paz County for how the state's water-adequacy report requirement actually plays out here.

Butler Valley: a state-land lease dispute with the same underlying signal

A second, separate basin in the county -- Butler Valley, northeast of Parker -- surfaced its own groundwater controversy in 2023, when Arizona Governor Katie Hobbs canceled a state land lease held by Fondomonte Arizona, a subsidiary of Saudi Arabia's Almarai dairy company, after an investigation found lease violations; the state also declined to renew related Butler Valley leases in 2024. Fondomonte had been growing alfalfa on leased state trust land using sprinkler irrigation, exporting the crop to feed dairy cattle in Saudi Arabia, and the cancellation followed public criticism that the company was pumping groundwater largely unchecked. This was a dispute over state-owned trust land under lease, not private land, so it doesn't directly restrict a private buyer's rights in Butler Valley -- but it's a second, independently documented signal that groundwater in the county's basins outside AMA boundaries is under real strain and drawing state-level attention, which is worth weighing into any long-term water-availability judgment for land in these areas.