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The court’s ruling paves the way for Nevada’s water regulators to manage groundwater depletion throughout the state, an issue of increasing importance as flows from the Colorado River and the levels of many of the region’s aquifers decline. State regulators can now view surface water and groundwater as a single source—something that has not historically been done in the state or elsewhere in the Southwest. They can also make changes to how the boundaries of groundwater basins are drawn up and divided as new studies reveal how much water they actually have and how they are interconnected with other sources of water.