Arizona moves toward new groundwater limits in San Simon as state data show falling water levels, land subsidence and earth fissures.

Nevada bill would transfer 257 federal acres to a Southern Nevada wastewater district, giving two major facilities more flexibility.

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.