These most arid states are frivolous in their water use-
The direct reason for this is their determination to grow and do things that belong in water rich areas — fight the areas’ natural lack of water or fight some other natural factor.* That’s why they build so many dams, dewater their streams, construct huge water pipelines, and mine desert aquifers.
The article below says Utah is making considerable progress reducing per capita consumption.
Conservation report card: Utah trying to cut use, but still a top water guzzler. By Patty Henetz. The Salt Lake Tribune
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* Rich County, Utah is the coldest area in Utah during the winter.