An ASU law professor questions Arizona's timing in the Colorado River lawsuit and explains why the states want different legal outcomes.

Arizona joins Nevada's lawsuit challenging federal Colorado River rules that could impose major water cuts on Lower Basin states.

New Arizona research finds that forest thinning and mulching help soil retain moisture and reduce the effects of prolonged winter drought.

October storms brought drought relief to five Colorado River Basin states, but long-term dryness persists across parts of the Southwest.

Two California groups sue the state over Delta water diversions, alleging violations of water laws and failures to protect fish, farms, and waterways.

Fifteen California libraries will offer water conservation, seed lending, recycling and climate education programs during 2026 and 2027.