Arizona Limits Construction Around Phoenix as Its Water Supply Dwindles - Slashd...

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Longtime Slashdot reader MightyMartian shares a report from the New York Times: Arizona has determined that there is not enough groundwater for all of the housing construction that has already been approved in the Phoenix area, and will stop developers from building some new subdivisions (Source paywalled, alternative source), a sign of looming trouble in the West and other places where overuse, drought and climate change are straining water supplies. The decision by state officials very likely means the beginning of the end to the explosive development that has made the Phoenix area the fastest growing metropolitan region in the country. The state said it would not revoke building permits that have already been issued and is instead counting on new water conservation measures and alternative sources to produce the water necessary for housing developments that have already been approved.

Maricopa County, which includes Phoenix and its suburbs, gets more than half its water supply from groundwater. Most of the rest comes from rivers and aqueducts as well as recycled wastewater. In practical terms, groundwater is a finite resource; it can take thousands of years or longer to be replenished. The announcement of a groundwater shortage means Arizona would no longer give developers in some areas of Maricopa County new permits to construct homes that rely on wells for water.

Phoenix and nearby large cities, which must obtain separate permission from state officials for their development plans every 10 to 15 years, would also be denied approval for any homes that rely on groundwater beyond what the state has already authorized. The decision means cities and developers must look for alternative sources of water to support future development -- for example, by trying to buy access to river water from farmers or Native American tribes, many of whom are facing their own shortages. That rush to buy water is likely to rattle the real estate market in Arizona, making homes more expensive and threatening the relatively low housing costs that had made the region a magnet for people from across the country.