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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallData centers use water mainly to remove heat from servers and related equipment. How much a particular facility needs depends on its size, cooling design, climate, heat load, operating choices and electricity supply. Communities should assess a project using its site-specific water plans and local supply conditions—not a generic industry figure or a single efficiency metric.
Where data-center water use comes from
In a common evaporative cooling system, heat from IT equipment passes through air-conditioning and chilled-water equipment to a condenser-water loop and then to a cooling tower. Water evaporating at the tower carries heat into the atmosphere. The facility must add makeup water to replace that loss; it also drains some water as blowdown to control mineral concentration.
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Cooling is not the only possible use. A project may also use water for humidification, landscaping and other operations. Its electricity supply can have water impacts too, particularly where power generation uses water. The U.S. Department of Energy’s Office of Indian Energy says use varies widely by cooling technology and local climate, and advises considering water associated with electricity generation when relevant: Data Centers for Tribal Economic Development: Frequently Asked Questions.
DOE’s May 14, 2026 FAQ says use can reach “millions of gallons a day” and that advanced cooling technologies can reduce water needs “sometimes by over 90%.” These are broad upper-end and potential-reduction statements, not typical consumption figures or forecasts for an individual project. No single national figure captures differences in facility boundaries, cooling systems, climate and whether electricity-related water is included.
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How to read water-efficiency claims
The DOE Federal Energy Management Program defines water usage effectiveness (WUE) as annual site water use in liters divided by annual IT equipment energy use in kilowatt-hours. It can help compare water intensity relative to IT energy, but it does not show whether a facility draws from a locally scarce source, takes water during a sensitive season or displaces another user. Ask what the metric includes, which water sources count, what period it covers and how its denominator is defined. Request absolute withdrawal and consumption figures, with potable and non-potable water shown separately. See DOE’s Cooling Tower Management guidance.
Cooling labels alone do not establish local impact. DOE FEMP discusses operational measures such as temperature and humidity set points, airflow management and air-side economizing; their savings depend on climate and operation. Compare a proposed design’s water savings with its power demand, wastewater effects and peak-season operation, and ask for measured results once the facility is running. Pennsylvania’s community guide also recommends asking which water sources are included in WUE: Community Guidance for Data Centers.
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Questions to ask about a proposed project
Use these questions in public meetings, planning reviews, discussions with the water provider and records requests. Ask for estimates before construction and actual operating data afterward, distinguishing projections from measurements.
Demand and timing
- What are projected peak, average daily and seasonal withdrawals for cooling, humidification, landscaping and other uses?
- How will demand change as the campus is built out, and what are the actual monthly or daily withdrawals once it operates?
Withdrawal, return and consumption
- How much water will the facility withdraw, how much will return to a water system and how much will be consumed, especially through evaporation? Require separate figures rather than treating them as interchangeable.
- Are the reported values estimates or measured results, and what facility activities and sources are included?
Sources and local competition
- Identify every source—municipal water, wells, surface water, reclaimed effluent or another supply—and the amount expected from each.
- Compare annual volume and peak demand with local supply, drought restrictions, private wells, ecosystems and other major users. Where warranted, request an independent feasibility or watershed-capacity analysis.
Cooling, energy and wastewater
- What cooling system is proposed—evaporative, air-cooled, closed-loop, hybrid or another design—and what are its water, discharge and energy implications under local weather and operating conditions?
- Where will blowdown and other process water go? Ask about volume, temperature, dissolved solids, treatment chemicals, pollutants, treatment capacity, residual or brine disposal, permits and who pays for necessary upgrades.
- Would water use associated with the project’s electricity generation materially affect the comparison between designs or the local assessment?
Drought, interruptions and accountability
- What happens during drought, water restrictions, heat waves or a supply interruption? Which source would take over, who can curtail use and what conditions trigger a restriction?
- Will actual water use and reduction efforts be reported publicly, how often, and under what permit or other requirement?
What water reuse can—and cannot—tell you
Reclaimed wastewater and other alternative sources can reduce demand for potable water, but a reuse claim needs to be assessed as a whole system: source reliability, treatment, energy, infrastructure, water quality, residual disposal and permits all matter. The U.S. Environmental Protection Agency’s 2023 account of the Quincy Water Reuse Utility in Washington describes a City of Quincy–Microsoft arrangement that treats data-center cooling wastewater through ultrafiltration, high-efficiency softening and reverse osmosis, then returns treated water to the data center. Concentrated residuals also require management. EPA’s Quincy, Washington Water Reuse Utility case study reports:
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- Five percent of makeup water remained potable groundwater; the case study says the city aimed to reduce that reliance further.
Those are figures for the Quincy case, not typical data-center values. The case also illustrates why fallback sources matter: when canal pumping stopped during a hot, dry, high-demand period in 2021, the system switched to potable groundwater. Ask whether the reuse supply is available during peak demand and what source would be used if it is interrupted.
Wastewater quality can constrain reuse. EPA says Quincy cooling-water blowdown had high total dissolved solids (TDS), challenging a municipal wastewater reclamation facility whose treatment process and permit were not designed for those concentrations. Separate industrial treatment kept that stream distinct and supported reuse. For another project, examine the residual stream and its destination as carefully as the water being reused. EPA’s industrial water reuse resources lists reclaimed wastewater, treated greywater, HVAC condensate, rainwater and stormwater as possible cooling-water sources or reuse approaches; suitability depends on local supply, treatment needs, water quality, regulation and system design.
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Permits, reporting and public access depend on location
There is no single nationwide answer to which agency controls a project’s water rights, withdrawals, wastewater discharge or public-comment process. Identify the relevant water-rights agency, water provider and wastewater regulator; then ask what permits apply and which submitted data will be public. The Pennsylvania community guide offers questions for local engagement, but requirements elsewhere must be checked with the responsible local and state authorities.
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Utah provides one specific example. Its Division of Water Rights says that, effective July 1, 2026, new data-center projects larger than 10,000 square feet that intend to draw at least 75 acre-feet per year are subject to a state reporting process. Utah’s page describes pre-construction submissions covering location, estimated annual withdrawal, discharge-treatment plans where applicable, estimated discharge-temperature adjustment and reuse or replacement efforts. It also describes annual reporting of actual withdrawals and reduction efforts, with reports published by the state. The page says facilities already operational or under construction before July 1, 2026, are exempt. These thresholds and rules apply to Utah, not automatically to other states: Utah Division of Water Rights: Data Centers.
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Build a fair comparison between project designs
If a community has more than one design or project proposal to evaluate, use the same questions and boundaries for each. A comparison is meaningful only when it distinguishes estimates from measured results and covers the same phases of build-out and operating periods.
| Compare | What to request |
|---|---|
| Withdrawal and timing | Annual and peak withdrawals, plus seasonal demand and build-out assumptions. |
| Consumption and returns | Consumed share, return flows and where returned water goes. |
| Sources and scarcity | Volume by source, local availability and seasonal constraints. |
| Cooling and energy | Cooling design, climate-adjusted operating assumptions, energy demand and material power-generation water use. |
| Wastewater | Volume, quality, treatment, residuals, discharge conditions and capacity. |
| Drought response | Fallback source, curtailment commitments and triggers. |
| Oversight and cost | Monitoring, public reporting, permit conditions and responsibility for infrastructure costs. |
How to start a local assessment
- Identify the project and its water sources. Establish the parcel, proposed build-out phases and each intended supply before relying on a campus-wide headline number.
- Request project and utility records. Seek water-demand projections, cooling and wastewater plans, relevant permits, supply-capacity information and any public reporting requirements.
- Separate the water figures. Record withdrawal, return flow and consumption separately; note source, time period, facility boundary and whether each number is estimated or measured.
- Compare demand with local conditions. Consider peak and seasonal supply, drought status, other users, private wells, ecosystems and wastewater-treatment capacity.
- Check resilience and follow-through. Find out what happens when normal supplies are unavailable, who can curtail use and whether actual withdrawals and reduction efforts will be publicly reported.
Without a named project and community, the applicable water rights, withdrawal limits, discharge permits, supply capacity, drought baseline and likely effects on nearby users cannot be determined. Those answers require local records and watershed and water-system information.
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