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Central Arizona Project joins Arizona lawsuit over Colorado River cuts

The Colorado River canal system that supplies 36% of Arizona’s water has formally joined the state’s legal challenge to federal cuts to river allocations.

Published Oct 29, 2026, 7:28 PM EDT | WFMZZ

The Central Arizona Project (CAP), which provides about 36% of all water used in Arizona, has officially joined the state’s litigation challenging the Trump administration’s cuts to Colorado River water allocations. CAP’s participation bolsters Arizona’s challenge to federal decisions that would reduce water deliveries from the river.