Water rights in the Southwest are complex, but in general, "surface water" (rivers and streams) is alloted according to historical water rights, but "ground wat

Water rights in the Southwest are complex, but in general, "surface water" (rivers and streams) is alloted according to historical water rights, but "ground water" (drilled wells) is available to whoever owns the land on the surface. From the article: Groundwater is the lifeblood of the rural Southwest, but just as the Colorado River Basin is in crisis, aquifers are rapidly depleting from decades of overuse, worsening drought and rampant agricultural growth. Residents and farms pull water from the same underground pools, and as the water table declines, the thing determining how long a well lasts is how deeply it was drilled. Now frustration is growing in Arizona's La Paz County, as shallower wells run dry amid the Southwest's worst drought in 1,200 years. Much of the frustration is pointed at the area's huge, foreign-owned farms growing thirsty crops like alfalfa, which ultimately get shipped to feed cattle and other livestock overseas. "You can't take water and export it out of the state, there's laws about that," said Arizona geohydrologist Marvin Glotfelty, a well-drilling expert. "But you can take 'virtual' water and export it; alfalfa, cotton, electricity or anything created in part from the use of water." Residents and local officials say lax groundwater laws give agriculture the upper hand, allowing farms to pump unlimited water as long as they own or lease the property to drill wells into. In around 80% of the state, Arizona has no laws overseeing how much water corporate megafarms are using, nor is there any way for the state to track it. Essentially, this means that in most of Arizona, the water in the ground is free and unmetered for agricultural use by anyone who owns enough land to drill a well. As one would guess, this creates a crisis when some users are drawing enough water to lower the water table on surrounding land.