San Diego County approved a plan to develop a U.S.-side system to capture and treat polluted water flowing through the Tijuana River.

New Mexico sued the federal government over unauthorized wells drilled for border wall construction in three protected groundwater basins.

Arizona Attorney General Kris Mayes calls for a statewide pause on new data centers, citing concerns about water use, power demand and costs.

A 4.25 million-gallon sewage spill in Pueblo contaminated the Arkansas River, prompting warnings to avoid the water downstream.

Utah is ending its toilet rebate program after nearly 6,000 replacements and will shift funding toward outdoor water conservation.

Monsoon storms ease drought in Arizona and New Mexico, while heat and dryness worsen conditions elsewhere in the Colorado River Basin.