Federal agencies are seeking more public input as they work toward a new definition of waters covered by the Clean Water Act.

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.