Drought and Long-Term Aridification in the United States
Much of the American West is in a multi-decade dry period that researchers describe as the most severe in over a millennium, reshaping how communities plan for water.
Drought is no longer just a seasonal event in much of the West. Researchers describe the period since 2000 as the worst megadrought in roughly 1,200 years, a shift some scientists prefer to call aridification — a permanent move to a drier baseline rather than a temporary dry spell.
The U.S. Drought Monitor tracks conditions weekly on a five-step scale from D0 (abnormally dry) to D4 (exceptional drought). Prolonged drought drains reservoirs, dries up wells, stresses agriculture, and forces emergency conservation rules.
Communities respond on two fronts: reducing demand through conservation, turf replacement, and pricing, and diversifying supply through reuse, stormwater capture, and desalination. The jurisdictions that fare best treat drought as a structural planning assumption rather than an emergency.
Sources & further reading
States facing this
Colorado
Idaho
Nebraska
Oklahoma
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