7 Cities in the U.S. Most Likely to Run Out of Water First, According to Data
America’s next major water crisis may not begin with empty reservoirs or dry household taps. It may start with higher bills, strict watering limits, delayed housing projects, and emergency rules that force families and businesses to use far less water.
That threat became more urgent on July 31, 2026, when the federal government proposed a new plan for managing the drought-strained Colorado River. The framework could require Arizona, California and Nevada to absorb combined reductions of as much as 3 million acre-feet in especially difficult years through 2036.
No reliable national study can name the exact order in which American cities will “run out” of water. However, recent reservoir forecasts, groundwater models, conservation plans and emergency declarations reveal which major communities could feel severe shortages first.
Corpus Christi, Texas
Corpus Christi currently presents one of the clearest examples of an urban water supply moving toward an emergency threshold. In May 2026, city officials said a Level 1 Water Emergency was projected for September, depending on rainfall and reservoir conditions.
Under the proposed emergency rules, residential customers would receive a monthly allocation of 6,000 gallons, reflecting a 25 percent reduction from the city’s 8,000-gallon baseline. Landscape watering would remain prohibited, and customers exceeding their allocations could face additional charges.
The city has been developing groundwater wells, wastewater reuse systems and seawater desalination proposals to reduce its dependence on reservoirs. A January 2026 supply update showed Lake Texana at 63 percent capacity, down from 74 percent one year earlier, with mandatory pumping reductions beginning if storage falls to 50 percent.
Corpus Christi is not expected to lose every source of water at once. Still, the possibility of emergency allocations makes it one of the cities closest to experiencing the practical meaning of running short.
Phoenix, Arizona
Phoenix officials strongly reject claims that the city is about to run out of water. The city receives roughly 60 percent of its supply from the Salt and Verde rivers and about 40 percent from the Colorado River, giving it more protection than communities relying on a single source.
However, both parts of that system face long-term climate and drought risks. Phoenix has built pipelines, stored water underground and invested in advanced water purification because officials recognize that future river deliveries may become less dependable.
Groundwater also creates concern across the wider Phoenix region. Arizona’s updated groundwater model found millions of acre-feet of projected unmet demand over 100 years, prompting the state to stop approving some new developments that depend entirely on groundwater.
That does not mean existing Phoenix residents are about to see their faucets fail. It means rapid growth, reduced Colorado River deliveries and limited groundwater could make new water supplies far more expensive and difficult to secure.
Las Vegas, Nevada
Few major American cities are as closely tied to one water source as Las Vegas. Southern Nevada receives about 90 percent of its water from the Colorado River, primarily through Lake Mead.
Lake Mead’s elevation has fallen by roughly 160 feet since January 2000, according to the Southern Nevada Water Authority. That decline has forced the region to remove decorative grass, limit certain water features and tighten rules for water-intensive cooling systems.
Las Vegas has also built a low-lake-level pumping station that can withdraw water even if the reservoir drops below older intake structures. Indoor water is extensively treated and returned to Lake Mead, allowing the city to receive return flow credits for much of what residents use inside their homes.
Those investments make Las Vegas better prepared than its desert location might suggest. Yet its overwhelming dependence on the Colorado River means every federal cut, poor snow season and decline in Lake Mead carries unusually high consequences.
Tucson, Arizona
Tucson has earned recognition for reducing water use even as its population has grown. The city stores Colorado River water underground, uses reclaimed water and manages groundwater as part of an integrated system designed to withstand drought.
Still, about 83 percent of Tucson Water’s total supply comes from recharged Colorado River water, according to the city’s planning documents. That leaves the community deeply connected to a river system that federal officials are preparing to manage with larger reductions.
Tucson maintained a Tier 2 drought status in 2025, with its local drought stages tied directly to federal Colorado River shortage levels. The city has prepared additional conservation measures that can be activated as conditions worsen.
Tucson has demonstrated an assured water supply and continues to expand recycled water, stormwater capture and advanced purification projects. Its risk comes less from immediate system failure and more from the possibility that stored supplies must support the city through a much longer and hotter period than planners once expected.
El Paso, Texas
El Paso receives water from the Rio Grande and two underground sources, the Hueco Bolson and Mesilla Bolson aquifers. River water is especially valuable during summer because using it allows the city to preserve groundwater for dry years.
The Hueco Bolson is also shared with Ciudad Juárez, Mexico, creating pressure on a resource used by a large cross-border population. El Paso Water says pumping from the aquifer peaked at about 26 billion gallons per year in 1989, before conservation and supply diversification reduced dependence on it.
The city now operates a desalination facility capable of producing as much as 27.5 million gallons of fresh water per day from brackish groundwater. It is also expanding aquifer recharge and developing an advanced purification system that will turn treated wastewater into drinking water.
These projects show that El Paso is not passively waiting for its traditional sources to decline. They also reveal how much money, infrastructure and technology the city must deploy to keep water flowing in one of the driest major metropolitan areas in the country.
San Antonio, Texas
San Antonio spent more than two years under Stage 3 watering rules after restrictions began in June 2024. Recent rainfall finally raised the Edwards Aquifer enough for the city to move to Stage 2 rules beginning August 4, 2026.
The improvement does not erase the region’s vulnerability. Under Stage 2, residents may generally use irrigation systems only once a week during designated hours, showing that conservation remains necessary even after rainfall.
The Edwards Aquifer Authority reported that conditions had improved enough by July 24 to reduce pumping curtailments in the San Antonio Pool. Stage 1 restrictions still reduce authorized withdrawals for affected permit holders by 20 percent for the period in which the restrictions apply.
San Antonio has avoided more severe shortages by developing recycled water, brackish groundwater desalination and underground storage. The length of its recent drought restrictions, however, shows how quickly the region can return to tighter controls if rainfall fades again.
Salt Lake City, Utah
Salt Lake City is not currently facing the same emergency conditions as Corpus Christi. Its own 2025 Water Conservation Plan, however, shows that existing conservation efforts will not be enough to keep future demand safely within projected supplies.
The city currently uses about 87,000 acre-feet of water annually. Without greater conservation, demand could rise to 131,000 acre-feet by 2060, compared with a projected future supply of approximately 126,120 acre-feet.
The apparent gap becomes larger because planners want to maintain about 15,000 acre feet of reserve supply for dry years and unexpected disruptions. Salt Lake City therefore estimates it must reduce annual use by an additional 20,780 acre feet beyond current conservation levels.
Climate change, population growth and dependence on mountain snowpack create the central challenge. A weak snow season can reduce both immediate runoff and the amount of water available to refill reservoirs for the following year.
Running out of water rarely happens overnight
For most American cities, a water crisis will not begin with every tap suddenly going dry. It will appear gradually through irrigation bans, construction limits, emergency surcharges, industrial restrictions and increasingly expensive projects designed to locate, transport or recycle new supplies.
The seven cities on this list have not given up, and several have built some of the country’s most advanced conservation and reuse systems. Their preparations are evidence of resilience, but they are also evidence that traditional water sources can no longer be treated as unlimited.
The cities most likely to suffer first may ultimately be the ones that delay difficult decisions about growth, pricing and conservation. Water may still come out of the faucet, but the cost of keeping it there is already rising.
