The supply picture
The supply is fixed. The demand is not.
Oil can be discovered, drilled, and replaced. Fresh water can only be allocated. The amount on Earth doesn't grow, the population it serves does, and the regions growing fastest are often the driest.
Lake Mead, the largest reservoir in the U.S., in July 2022. Its lowest level since 1937, when the reservoir was still filling.
NASA Earth Observatory, 2022In August 2026, Lakes Mead and Powell together held less water than at any point since Powell began filling in 1963.
Western Water, August 2026People depend on the Colorado River. After the seven states failed to agree, Washington imposed a new operating plan for 2027 and beyond.
U.S. Bureau of Reclamation, 2026Lost from the Ogallala Aquifer, which waters America's breadbasket, since large-scale pumping began.
U.S. Geological SurveyOf the world's monitored aquifer systems are declining faster now than they were before 2000.
Jasechko et al., Nature, 2024People, one in four worldwide, still lack safely managed drinking water.
WHO / UNICEF, 20251 acre-foot = 325,851 gallonsEnough to cover an acre one foot deep, or supply about three Arizona homes for a year.
A new source of demand
Artificial intelligence is thirsty.
Every AI search, chatbot, and model runs on servers that generate enormous heat, and much of the cooling that keeps them running uses water. Data centers are now competing for the same supply as cities and farms.
U.S. data centers consumed about 17 billion gallons of water directly in 2023, roughly triple what they used in 2014, and construction has accelerated since.
Direct water use by U.S. data centers. Lawrence Berkeley National Laboratory, 2024 (21.2B and 66B liters)A market is forming
Water now has a price, and it's being traded.
What was once treated as free is now bought, sold, leased, and hedged. As supply tightens, water is increasingly priced like the scarce resource it is.
Water futures began trading on Wall Street for the first time, on CME Group, tied to the price of water in California.
CME Group, 2020In water rights and leases change hands across Western U.S. markets each year, about 2.5 million acre-feet.
WestWater Research, 2026Rise in the price of Central Arizona Project water in a single year, from 2022 to 2023.
WestWater Research, 2026Prices differ by basin and year, and they don't rise everywhere at once. They have risen fastest where water is scarcest.
How the world is responding
Four ways to stretch a fixed supply.
No one can make more fresh water. But there are four broad ways communities are trying to make the water they have go further.
Water rights
Rules that decide who gets water and how much. Across the American West, the oldest rights are served first in a shortage, so newer users are cut off first.
Using less on the land
Agriculture uses most of the fresh water people withdraw. Efficient irrigation and drought-tolerant crops can grow more food with less of it.
Storage & banking
Aquifer recharge, groundwater banking, and reservoirs that hold water in wet years so it can be used in dry ones.
Treatment & reuse
Desalination, wastewater recycling, and leak repair that create usable supply where the natural supply has run short.
340 feet downWater.