Basin sweeps are one of the ways Arizona's water agency keeps track of groundwater levels across the state. After crews are ...

Falling water levels are a threat to the aquifer in an agricultural region of western Arizona dominated by Saudi-owned farming conglomerate Fondomonte, state regulators told residents in a public ...

The Gila Bend groundwater basin about 125 miles northwest of Tucson has one of the fastest-falling aquifers known on the planet, a new study shows. The aquifer in the Gila Bend Basin — where pumping ...

Arizona needs to strengthen aquifer-protection requirements for the massive proposed Copper World mine to guard against groundwater pollution beneath it, Pima County officials say. The county ...

Almost 40 percent of Arizona’s water supply comes from an ancient source — aquifers deep underground that collected water over millions of years. Those aquifers aren’t considered a renewable source by ...