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HB 2203

historical water use; subsequent AMA

57th Legislature - First Regular Session Introduced by Gail Griffin

Arizona bill allowing water rights based on historical use in Active Management Areas was passed but vetoed by Governor, affecting agricultural and municipal water allocations during shortages.

Vetoed by Governor
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Bill Summary · HB 2203

Legislative bill overview

HB 2203 modifies Arizona's Active Management Area (AMA) water rights system by allowing water users to establish or maintain water rights based on historical water use patterns. The bill was passed by the legislature on April 28, 2025, but was vetoed by the Governor on May 2, 2025.

Why is this important

Arizona's water management directly affects agricultural operations, municipal water supplies, and industrial users in a drought-prone state where water scarcity is a critical long-term issue. Historical water use rights determinations can significantly impact who receives water allocations during shortage periods and influence the state's ability to manage declining aquifer levels.

Potential points of contention

  • Agricultural vs. municipal interests: Grandfathering historical use may benefit established agricultural operations while potentially disadvantaging growing urban areas competing for limited water resources
  • Aquifer sustainability: Locking in historical usage patterns could conflict with Arizona's goal of achieving long-term groundwater sustainability, particularly in AMAs where overdraft has been a persistent problem
  • Rural economic concerns: The Governor's veto suggests concerns about the bill's approach, though the specific rationale would clarify whether it prioritizes environmental protection, inter-regional equity, or other policy objectives

Compiled from official sources — confirm details with the bill’s official record.

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