A quarter of the world's data centers are running on borrowed water

One in four data centers on Earth is already drawing water from a system that cannot fully cover its own demand for at least one month a year. That is the headline finding of a new global analysis published in Environmental Science & Technology, which cross-referenced the locations of the world's data centers against local water availability. The researchers found that 25% of facilities sit in areas where water demand exceeds supply for at least one month annually. Under a future climate scenario, the share of data centers in water-stressed areas could climb to one-third. For an industry that markets itself on reliability, that is a quiet but structural vulnerability: the physical infrastructure that powers the cloud is increasingly dependent on a resource that is already oversubscribed, and climate change is tightening the constraint rather than loosening it.

The study is the first global, facility-level assessment of data center water risk, and its timing is uncomfortable for the industry. Hyperscale cloud providers, AI startups, and colocation operators have spent the past two years competing for power capacity, with electricity availability treated as the binding constraint on new data center construction. Water has been the quieter constraint, but it is no less binding. Data centers use water primarily for cooling, and the most efficient cooling systems - evaporative cooling towers - consume large volumes of it. The new analysis suggests that the industry's site-selection playbook, which has historically prioritized cheap power, low latency, and tax incentives, has systematically underweighted water risk. The result is that a meaningful share of the world's digital infrastructure is now operating in regions where water is already scarce for part of the year, and that scarcity is projected to worsen.

The methodology matters because it moves the conversation from anecdote to aggregate. Rather than relying on individual case studies of drought-stricken facilities, the researchers mapped data center locations against water supply and demand data at a global scale. The finding that one-quarter of facilities face at least one month of water stress per year is a baseline estimate; the future climate scenario, which pushes the share to one-third, reflects a world in which temperatures rise and precipitation patterns shift. For executives, the implication is that water risk is not a niche environmental concern but a portfolio-level exposure. A data center that is water-stressed for one month a year today may be water-stressed for two or three months a decade from now, and the facilities most exposed are likely to be the ones whose cooling systems depend most heavily on water.

The regulatory and financial context is shifting in ways that amplify the finding. Water rights are increasingly contested, and jurisdictions that have historically granted data centers generous incentives are beginning to ask harder questions about resource consumption. In several drought-prone regions, utilities have already imposed restrictions on new high-water-use connections, and some municipalities have pushed back on data center development over water concerns. The new study provides a quantitative basis for those concerns, and it gives regulators a global benchmark to cite. For data center operators, the risk is not just operational but reputational and financial: a facility that cannot secure water is a facility that cannot run, and a facility that cannot run is a stranded asset. Investors, who have poured billions into AI infrastructure on the assumption of uninterrupted uptime, are increasingly scrutinizing environmental, social, and governance factors, and water is emerging as a material risk category.

The strategic response is already taking shape, though the study suggests it needs to accelerate. Some operators are retrofitting cooling systems to use less water, shifting from evaporative cooling to closed-loop or air-based systems that trade higher energy use for lower water consumption. Others are exploring on-site water treatment and recycling, or siting new facilities in regions with more abundant water resources. But retrofits are expensive, and the choice between water efficiency and energy efficiency is a real trade-off: reducing water consumption often increases electricity consumption, which complicates the already difficult task of securing clean power. The study's contribution is to make the trade-off explicit and to give it a global price tag in the form of risk exposure. For a company planning a new data center, the analysis offers a clear directive: water stress should be a first-order siting criterion, not an afterthought.

For executives across the digital economy, the stakes extend beyond the data center itself. Every AI model training run, every cloud migration, and every streaming service depends on physical infrastructure that consumes water. The companies that own and operate that infrastructure are the same companies that have made public commitments to sustainability, and water stress is the kind of issue that can undermine those commitments in a visible way. A data center that shuts down due to water shortage is not just an operational failure; it is a reputational event that invites regulatory scrutiny and community backlash. The new analysis suggests that such events are not hypothetical. They are already possible for one-quarter of the world's data centers, and the probability is rising.

The bottom line for decision-makers is that water has become a strategic constraint on the digital economy, and it deserves the same level of attention as power. The study's numbers are a baseline, not a worst case, and the trend line is clear: more data centers, more AI workloads, and a warmer climate all point toward more water stress, not less. Companies that act now - by auditing their existing portfolios, incorporating water risk into site selection, and investing in water-efficient cooling - will be better positioned than those that wait for the next drought to force the issue. The cloud is not just made of silicon and electricity. It is made of water too, and that water is running short.