Science1 publisher2 min readPublished
Kearny, Arizona is getting through the year on 13 percent of its Gila River water
Science News puts one town's 87 percent water cut beside a national heat record, and the case for treating that cut as the new baseline rests on a Southwest megadrought that has already run for decades.
The Scientist · Science desk
What happened
- Science News reports that Kearny, Arizona, had its supply from the Gila River, a tributary of the Colorado, cut by 87 percent this year.
- The Lower 48 states recorded their hottest July, beating a Dust Bowl mark set in 1936.
- More people than usual died during Western Europe's heat wave, with many of the deaths in France and Germany, where major heat waves are historically rare and populations underprepared.
- Some reservoirs on the Colorado River hit record lows over the same period.
- Physiologists are working with older volunteers to test whether bodies can be heat-proofed in advance using simple techniques such as sitting in a hot bath.
Compiled by The ScientistSomething wrong?How this is made
Why it matters
- decision Kearny has to set its restrictions for 2027 before anyone knows what the Gila will deliver. The planning unit for a town this size is the year.
- constraint A percentage cut travels badly between utilities. Another town cannot measure its own supply against 87 percent without the baseline volume.
- exposure The deaths concentrated in the countries least practised at heat. The institutions that have to respond next time are the ones with no existing heat plan to run.
- capability If graded exposure works in older volunteers, heat protection becomes something a clinic can give before a heat wave instead of a cooling centre opened during one.
An 87 percent cut leaves 13 percent [13]. That remainder, plus strict household restrictions, is what the town is running on, and Nikk Ogasa reports the restrictions will get Kearny through [8]. The note, which introduces the magazine's October 2026 issue [15], gives the percentage without the underlying volume. The cut cannot be turned into gallons per resident per day.
The July record that fell was 90 years old [14]. Almost half of US states were in drought this year, and Western Europe's June and July were its hottest months on record as well [4][1]. A hot month and a low reservoir are two different problems for a water utility: the first raises demand, the second lowers supply, and the Colorado basin, which supplies 40 million people in the West, had both [5][6].
Katarina Zimmer's reporting rests on a physiological fact: human bodies learn and adjust with repeated exposure to heat [10]. The awkward part is who needs that adjustment most. Older people and people with chronic conditions are the most vulnerable to heatstroke and related illness [11], and for them a deliberate heat exposure is a hazard in itself.
The editor's note makes the claim that this may become the new normal [16], and it rests that claim on a megadrought that has persisted for decades across the Southwest and that the latest research suggests might not relent anytime soon [9]. The note summarises that research and does not cite it. Kearny this year is a single observation, and planning to it is a bet that 2026 sat near the middle of the distribution rather than at its edge. For next year, the note says, there are no guarantees [8].
What to watch
- Kearny's 2027 allocation from the Gila, and whether the 87 percent cut repeats, eases or deepens.
- Results from the physiologists' hot-bath work with older volunteers, and whether the protocol holds outside a lab.
- Whether the megadrought research the note points to appears as a citable study with a stated range of outcomes.