4.4 Arizona Water Rights and Environmental Issues

Arizona Water Law: Two Separate Systems

Arizona regulates surface water and groundwater under different doctrines — a distinction the state exam loves.

Surface Water — Prior Appropriation

Rivers, streams, and lakes follow the prior appropriation doctrine: "first in time, first in right." The earliest user to put water to beneficial use holds a senior right that is satisfied fully before any junior right gets a drop in a shortage. Key features:

• Rights attach to beneficial use, not to land ownership.
• Rights can be lost through abandonment or non-use ("use it or lose it").
• New surface diversions require a state permit from the Arizona Department of Water Resources (ADWR).

Groundwater — Location Decides Everything

Groundwater is governed by the Groundwater Management Act of 1980. The rules depend entirely on whether the land sits inside an Active Management Area (AMA).

Memory hook: Surface = prior appropriation. Groundwater = AMA or not.

AMAs, Assured Water Supply, CE Updates, and Disclosures

The Eight Active Management Areas

The original 1980 Act created five AMAs. Two more were added in 2022–2024 and an eighth in 2026, so Arizona now has eight AMAs:

Exam update: Older materials still say "five AMAs." The current count is eight. Watch the question's wording — if it asks about the original statutory AMAs the answer is five, but the current total is eight.

Assured vs. Adequate Water Supply

Developers selling subdivided lots inside an AMA must obtain ADWR's Certificate of Assured Water Supply. Without it, the lots cannot be sold — a deal-breaker buyers and agents must verify.

2025 Continuing-Education Changes

Effective January 1, 2025, ADRE added three new one-hour mandatory courses inside the existing 24-hour renewal total for salespersons and associate brokers:

• Arizona Water (1 hour)
• Firewise (1 hour)
• Deed Fraud (1 hour)

These sit alongside the long-standing 3 hours of Agency Law/Contract Law and 3 hours of Commissioner's Standards / Requirements of the Licensee. A licensee may earn no more than nine CE hours in any 24-hour period.

Environmental Disclosures

Trap: The Affidavit of Disclosure is an Arizona-specific document required for resale of unsubdivided rural land in unincorporated areas — do not confuse it with the standard SPDS (Seller's Property Disclosure Statement).

Water Due Diligence and Other Special Arizona Topics

Verifying Water Before a Sale

For rural and new-build transactions, water is often the deal's pivot. A licensee should help the buyer confirm:

1. Inside an AMA — does the subdivision hold a Certificate of Assured Water Supply? No certificate, no recordable plat, no sellable lots.
2. Outside an AMA — is there a Certificate of Adequate Water Supply, and has the inadequacy (if any) been disclosed to the buyer in writing?
3. Private well — is it registered with ADWR, what is the recovery/flow rate, and is a shared-well agreement recorded?
4. CAP water — does the municipal supplier draw on the Central Arizona Project (Colorado River allocation), which is subject to shortage-tier cutbacks?

Colorado River shortage declarations have triggered junior-priority cuts to Arizona's CAP allocation, which is why assured-supply documentation is now a front-line disclosure issue and why ADWR has tightened approvals in fast-growing AMAs.

Mineral, Solar, and Air Rights

Environmental Disclosure Checklist

The 2025 CE Bundle in Context

The three new 2025 one-hour courses each map to a live Arizona risk: Arizona Water (scarcity and assured-supply law), Firewise (wildfire-urban-interface defensible space), and Deed Fraud (rising title-theft scams targeting vacant lots and elderly owners). All three count toward the 24-hour total; none is additive on top of it, and the 9-hours-per-day cap still applies. A salesperson renews every two years by the license expiration date.

Trap: Outside an AMA, the standard is adequate (disclosure-based), not assured (must prove 100 years). Swapping these two words is the single most common water-question distractor on the Arizona exam.