If Arizona’s Colorado River water allocation was cut to zero, “we could burn through the available groundwater in 50 years,” Famiglietti said. “We’re talking about decades. That’s scary.

They estimated that annual groundwater losses in the Colorado River Basin have averaged more than 1.2 million acre-feet — about four times larger than the amount of water the Las Vegas area is ...

As the seven Colorado River Basin states haggle over the future of water allocations, authors of a new report on groundwater argue that equal attention should be paid to the water beneath our feet ...

Estimates of water consumption in the Colorado River basin do not include water exports from the basin, reservoir evaporation or natural losses. Percentages may not add up to 100 percent because ...