Phoenix, AZ, October 16, 2026 —

Arizona is joining Nevada in a lawsuit against the U.S. Department of the Interior over federal cuts to the Colorado River water supply. The states’ argument is that Upper Basin states are not meeting their water delivery obligations and that the resulting reductions place a disproportionate burden on Lower Basin states, including Arizona.

The dispute centers on how water cuts are being imposed among states connected to the river. Arizona and Nevada contend that the federal approach does not adequately address what they describe as Upper Basin states’ failure to fulfill delivery obligations, while requiring Lower Basin states to absorb an unfair share of the reductions. Those claims are the states’ position in the dispute; the information provided does not include a response from the Interior Department or the Upper Basin states.

The available summary does not specify when the lawsuit was filed, what legal claims it raises, or the amount or precise terms of the federal cuts. It also does not identify which Upper Basin states are alleged to be falling short of their obligations, or describe the requested outcome of the case. Arizona’s decision to join Nevada places both states together in challenging the federal action, but further details about the litigation were not provided.

The case concerns the allocation of reductions in Colorado River water supply and the obligations states say should guide those decisions. Whether a court will address the states’ claims, and what effect the lawsuit could have on the federal cuts, is not stated in the available information.


Story summarized from the original created by David Baker on www.azfamily.com, see more information here.

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