The term “day zero water” has become synonymous with a worst-case scenario for public water resources. It refers to a moment in which a city or region’s water supply is almost depleted and officials cut tap supply to communities.
This crisis was narrowly averted in 2018 in Cape Town, South Africa, which approached the threshold of a day zero event after rationing was almost not enough.
Subsequently, environmental researchers and resource insiders have voiced concern over the possibility of water running out in U.S. cities after years of drought have reduced groundwater in places such as the Great Plains and the Southwest.
In a recent study published in Nature, researchers noted “rapid groundwater-level declines” globally in the 21st century of more than 0.5 meters (20 inches) per year across 170,000 monitoring wells and 1,693 aquifer systems. […]
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