Low river flows halt Grand Valley irrigation as drought drains Colorado reservoirs and leaves Blue Mesa at just 17% of projected live capacity.

Arizona’s largest Colorado River water district clears a procedural step for possible litigation while pushing for a Lower Basin agreement.

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.