How Much Water Do Data Centers Really Use?

Last updated: 6 July 2026

Many headlines about data center water usage conflate withdrawal with consumption, producing figures that are simultaneously overstated and understated. As of 2023, U.S. data centers directly consumed 17.4 billion gallons of water for on-site cooling, but adding the indirect water used to generate their electricity pushes the real total to roughly 228 billion gallons.

Withdrawal vs. Consumption: Why the Numbers Don't Match

Water withdrawal is the total volume removed from a source, whether a municipal supply line, a groundwater well, or a surface water intake, before any portion is returned. It does not equal lost water. Many cooling systems discharge a significant share back to wastewater treatment or surface bodies after use. The USGS applies this distinction in its industrial and thermoelectric water-use reporting framework, treating withdrawal and consumptive use as separate tracked quantities, the same way those metrics are tracked for agriculture and power generation.

Consumptive use is the ecologically meaningful number. It represents the volume that leaves the local hydrological cycle entirely, primarily as water vapor lost through evaporative cooling. This is the figure that stresses aquifers, reduces streamflow, and draws down municipal reserves during drought. According to industry analyses, data centers retain roughly 75 to 85 percent of what they withdraw as consumptive loss. Equinix's publicly disclosed 2024 sustainability figures show approximately 85 percent consumption relative to withdrawal (1.2 billion gallons consumed of 1.4 billion gallons withdrawn), reflecting a facility portfolio that mixes cooling technologies.

There is a third category most facility-level disclosures omit entirely: indirect water use from electricity generation. Generating the power that runs a data center withdraws and consumes additional water at the thermoelectric power plant. U.S. indirect water consumption from data center electricity demand reached approximately 211 billion gallons in 2023, roughly 12 times greater than the 17.4 billion gallons consumed directly, based on analyses from the Environmental and Energy Study Institute and Berkeley Lab. A facility reporting a strong Water Use Effectiveness (WUE) score while drawing from a coal-heavy grid is telling only a fraction of its actual water story.

What the Actual Numbers Show, Nationally and by Facility Size

U.S. data centers directly consumed 17.4 billion gallons in 2023, according to analyses cited by the Environmental and Energy Study Institute. Projections from the same research place annual direct consumption between 38 and 73 billion gallons by 2028, depending on how aggressively AI infrastructure buildout proceeds. Globally, Google's facilities alone withdrew 7.8 billion gallons in 2024 and consumed 6.1 billion gallons of that total. Equinix consumed 1.2 billion gallons globally in the same year. These corporate disclosures represent the clearest recent benchmarks available, since no single authoritative global total across all operators is currently published.

Per-facility water consumption spans more than an order of magnitude depending on scale. Small facilities typically consume fewer than 100,000 gallons per day; a mid-size 15 MW facility runs closer to 300,000 gallons per day (roughly 110 million gallons annually); hyperscale campuses range from 300,000 to 5 million gallons per day. Google's facility in The Dalles, Oregon drew roughly 550,000 gallons daily as a representative mid-range hyperscale benchmark. Northern Virginia's data center cluster consumed approximately 2 billion gallons in 2023, a 63 percent increase from 2019, demonstrating how quickly aggregate demand compounds when dense concentrations of facilities expand simultaneously.

Cooling Technology and Data Center Water Usage

Evaporative cooling and chilled-water systems with cooling towers sit at the top of the water intensity spectrum, consuming approximately 0.4 to 0.8 gallons per kWh (1.5 to 3.0 liters/kWh). At peak summer load, that translates to roughly 2,500 gallons per day per megawatt of cooling capacity. Every ton-hour of cooling in a typical tower evaporates approximately 1.8 gallons, per EPA figures, with total make-up water including blowdown losses reaching approximately 3.0 gallons per ton-hour. According to Berkeley Lab, hyperscale data center WUE averaged approximately 0.36 liters per kWh in 2023 and is projected to rise to 0.45 to 0.48 liters per kWh by 2028, driven largely by growing adoption of liquid cooling rather than a decline in efficiency.

Air-cooled systems consume zero evaporative water, trading consumptive water savings for higher energy consumption. Their PUE typically runs 1.4 to 1.8 versus below 1.4 for well-run chilled-water plants (Berkeley Lab). Single-phase immersion cooling similarly requires no evaporative water for the primary cooling loop. Microsoft's Singapore facility reported a WUE of just 0.02 liters per kWh, versus 1.52 liters per kWh at its Arizona facilities, demonstrating how dramatically location and technology choice interact when both are optimized together.

Adiabatic pre-cooling sits between these extremes and is frequently missing from headline comparisons. It uses water mist to reduce inlet air temperature before air enters a dry heat exchanger, meaning water consumption only activates during the hottest ambient conditions. In moderate climates, adiabatic systems approach the near-zero water intensity of air-cooled designs for the majority of operating hours while avoiding the worst of the evaporative range.

Where Local Geography Turns Aggregate Numbers Into Concentrated Risk

National totals are abstract until mapped onto watershed-level supply constraints. Phoenix-area data centers used an estimated 385 million gallons annually for direct cooling as of 2024, according to a Ceres nonprofit analysis, a figure the same report projects could reach 3.7 billion gallons by 2028 in a region already classified as water-stressed. That projection has drawn methodological criticism: the director of Arizona State University's Kyl Center for Water Policy has publicly disputed some of the report's comparative assumptions, arguing that measuring in gallons rather than acre-feet overstates the apparent scale to a general audience.

Northern Virginia's 63 percent increase in data center water consumption between 2019 and 2023 exceeded demand growth in almost every other local industrial sector during the same period. These two clusters demonstrate that national averages conceal intensely localized pressure on specific aquifers and municipal treatment systems. Consider a facility operating at a best-in-class WUE of 0.4 liters per kWh: at 100 MW of continuous load (roughly 876 million kWh annually), that efficiency rating still translates to approximately 93 million gallons consumed per year, a derived figure showing the math. Efficiency metrics matter, but communities, utilities, and water boards need absolute volumetric figures tied to specific withdrawal points to assess actual supply risk.

What Low-Water and Waterless Cooling Achieves in Documented Deployments

Microsoft's Quincy, Washington facility uses 260 million gallons per year of non-potable Columbia Basin Project water delivered through a dedicated water reuse utility, alongside a separate 138 million gallons per year of recycled cooling water from a closed-loop treatment system. Together, these two non-potable sources have cut the facility's reliance on potable groundwater to roughly 11,000 gallons per year, according to the EPA's case study on the project.

Closed-loop cooling systems broadly reduce freshwater use by up to 70 percent compared to open evaporative systems, according to Berkeley Lab analyses of retrofitted and purpose-built facilities. Equinix's Toronto facility uses deep lake water cooling drawn from Lake Ontario, cutting energy needs by 50 percent or more while returning all water to source with no net consumptive increase, per the company's own sustainability disclosures. Equinix's Paris PA10 facility exports waste heat to a local urban heating network, eliminating the need for consumptive cooling in third-party systems and providing low-carbon heat to surrounding buildings.

The Pawsey Supercomputing Centre in Perth operates a closed geothermal aquifer loop: water is extracted from the Mullaloo aquifer at approximately 21 degrees Celsius, used for cooling, heated to approximately 31 degrees Celsius, and reinjected, displacing no net groundwater volume, per CSIRO's own documentation of the system. These deployments share a common architecture: they rethink the cooling loop rather than incrementally improving evaporative efficiency. The difference between a 10 percent WUE improvement on a conventional cooling tower and a closed-loop system that eliminates consumptive loss is structural, not marginal.

Reading a Water Disclosure Critically, and What Policy Tools Currently Exist

A credible facility-level disclosure covers four elements: total withdrawal volume and source type (municipal, groundwater, or surface water); total consumptive use as a distinct figure; WUE expressed in liters per kWh; and indirect water use allocated from electricity consumption. Disclosures that report only WUE or only aggregate "water use" without distinguishing withdrawal from consumption are incomplete by the standards the USGS applies to every other industrial water user in its national reporting framework, standards that states including Minnesota and Maryland have now begun encoding into statute.

Minnesota and Maryland enacted data center water disclosure laws in 2025. Idaho, South Dakota, Utah, and West Virginia followed with enacted legislation in 2026. California's State Water Resources Control Board is exploring rules to ban potable water use for non-essential cooling tasks. More than 30 proposed bills were introduced across 16 states during 2026 legislative sessions. No federal standard currently mandates indirect water use disclosure or watershed-level impact assessment for data center permitting. The gap between voluntary corporate WUE reporting and mandatory consumptive-use disclosure tied to local hydrology remains the most significant policy blind spot in current data center water governance.

What These Numbers Actually Mean

Accurate data center water usage figures should guide local permitting, corporate disclosures, and drought contingency planning, yet the measurement gap between what facilities report and what watersheds actually absorb remains wide. Direct consumptive use is real and growing: 17.4 billion gallons nationally in 2023, concentrated in water-stressed regions, projected to more than double by 2028. That number sits on a spectrum shaped by cooling technology, local climate, and whether indirect electricity-generation water is counted at all. Understanding which number a headline is citing, withdrawal or consumption, facility-level or grid-attributed, is the first step toward evaluating any claim about the water footprint of data centers with confidence.

Water consumption figures in this piece are drawn from corporate sustainability disclosures and government or nonprofit research projections that update on an annual cycle. Verify current-year figures against the cited primary source before relying on them for permitting, planning, or further citation.

Last updated: 6 July 2026