Why a 100-year supply? How Arizona got its famous, yet arbitrarily numbered groundwater rule


Arizona’s 100-year water supply requirement came into sharp focus this year when Gov. Katie Hobbs announced news of a potential shortfall.It came up again recently when state Senate President Warren Petersen publicly discussed why the requirement is 100 years and not some other number.Petersen, R-Gilbert, said the number is arbitrary during a meeting about the state’s financial health in November. Petersen denied he’s planning, or has heard of plans, for new legislation next year to change the number.The longtime politician hailing from a family of homebuilders said in the aftermath of Hobbs’ announcement he wants the public to know Arizona has “plenty of water” to continue building homes. He stood by the position in a Dec. 13 interview on azcentral.com’s Gaggle podcast.“Why is it 100 years?” he said on the podcast. “Why isn’t it 105 years — why isn’t it 95 years? Cali …

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