Arizona v. California
Headline: Order requires Arizona, California, and Nevada to list existing mainstream water rights with priority dates, lets Interior submit federal claims, and allows parties to ask the Court to decide unresolved disputes.
Holding:
- Requires states to list claimed mainstream water rights and priority dates within three years.
- Requires the Secretary of the Interior to report federal claims for mainstream water rights.
- Allows any party to ask the Court to resolve unresolved water-rights disputes.
Summary
Background
The Court granted a joint motion to change Article VI of a prior court order from March 9, 1964. The amendment requires the States of Arizona, California, and Nevada to provide, within three years, lists of their present perfected rights in the mainstream waters, showing claimed priority dates and measured in consumptive use, except for rights tied to federal establishments. The Secretary of the Interior must provide similar information about any claims by the United States. Any named party may present its own claim or oppose others’ claims.
Reasoning
The Court’s action answers a practical question about how to sort competing water claims: it ordered a formal exchange of information and kept the option for judicial resolution if disagreements remain. By amending Article VI, the Court required the states and the federal agency to identify claimed rights and their dates so priorities can be compared. If the parties and the Secretary cannot agree about which rights exist or their priority dates, any party may ask the Court to determine those rights.
Real world impact
This order starts a process to document and sort competing claims to mainstream water. States and the federal government must prepare inventories, which should make it easier to identify who claims what water and in what order. The decision is procedural rather than a final ruling on who actually holds the water rights, and affected water users and state or federal officials may still seek a final court determination if disputes persist.
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