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Data centers use electricity to run servers, storage and networking equipment, and they use cooling systems to carry away the heat those machines produce. The local effect of a proposed facility depends less on a national average than on its size, cooling design, water source, peak demand, grid connection, wastewater arrangements, climate and distance from homes. A large project can strain water or electric infrastructure during hot, high-demand periods, while another using a different design and location may have a smaller local effect. The practical way to assess a proposal is to obtain monthly and peak-day resource estimates, identify who pays for upgrades, and require enforceable rules for water, wastewater, noise and expansion.
What does a data center actually consume?
A data center is an industrial building full of computers. Servers process applications and artificial-intelligence workloads; storage systems hold data; network equipment moves traffic. All of that equipment draws electricity and releases heat. Cooling, power conversion, lighting, pumps and other support systems use additional electricity so the information-technology (IT) equipment can operate reliably.
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The Congressional Research Service (CRS) describes IT equipment as roughly half or more of a facility’s electricity demand, with much of the remainder used by cooling and other infrastructure. The exact split changes with workload, equipment efficiency, climate, building design and operating conditions. A facility that runs dense, high-power computing continuously will have a different load profile from one with lighter or more variable workloads. CRS explains the basic energy and cooling relationship in its data-center energy FAQ.
Water accounting needs the same care. A site may withdraw water from a utility, river, reservoir, aquifer or reclaimed-water system; consume some of it, usually through evaporation; and discharge the remainder as wastewater. “Withdrawal,” “consumption” and “discharge” are not interchangeable. Water consumed is no longer immediately available for reuse at the source, while discharged water may return to a treatment plant or receiving water after treatment.
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Facility water-use metrics such as water usage effectiveness (WUE) generally describe direct water consumption relative to IT energy. They do not include all water used to generate the electricity or manufacture servers and other hardware. That broader footprint can be much larger than the water used inside the building.
How do cooling systems use electricity and water?
Cooling design is the main reason two data centers with similar computing capacity can have very different water profiles. Air-cooled systems use fans, chillers and heat exchangers to move heat without necessarily consuming large volumes of water. Liquid systems carry heat closer to processors or through facility loops; some are closed-loop and recirculate fluid, while others use more water.
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Evaporative cooling lowers air or water temperature by letting some water change into vapor. It can reduce electricity use compared with mechanical refrigeration in suitable conditions, but the evaporated water is consumed. Hot, dry weather and high computing loads can increase that demand. Open-loop liquid systems generally use more water than closed-loop designs, according to CRS, but “liquid cooling” is not one single technology and should not be treated as a guarantee of either high or low use.
Cooling choices involve trade-offs. A design that minimizes direct water consumption may require more electricity for mechanical cooling. A system with fewer fans or different heat-rejection equipment may alter the site’s noise profile. The United Nations Conference on Trade and Development discusses these water-energy-noise trade-offs in Digital Economy Report 2024, Chapter III.
How much electricity do U.S. data centers use?
National figures provide context, not a forecast for a particular neighborhood. Lawrence Berkeley National Laboratory (LBNL) estimated U.S. data-center electricity use at about 176 terawatt-hours (TWh) in 2023, approximately 4.4% of U.S. annual electricity use. The estimate, reported in its 2024 United States Data Center Energy Usage Report, excludes cryptocurrency mining in the CRS summary of the report.
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That national total combines facilities of many sizes and types. A local proposal should instead disclose its expected demand at each construction phase, the maximum coincident load, and the timing of that load. A project can be modest on an annual-average basis but still require substantial transmission, substation or distribution capacity for its peak operation. Planned expansions can also change the answer years after the first building opens.
How much water do data centers use?
CRS cites an estimate of about 17 billion gallons of direct U.S. data-center water use in 2023, up from an estimated 5.6 billion gallons in 2014. Those figures cover direct facility use; they do not include all water associated with electricity generation or hardware supply chains. CRS also cautions that the federal government has not conducted a systematic assessment of data-center water use, and facility reporting is limited. Read the boundary before comparing any number.
LBNL estimated an additional, indirect U.S. water footprint of nearly 800 billion liters in 2023 for the electricity used by data centers. Its national average indirect-water intensity was 4.52 liters per kilowatt-hour. This is not cooling-water use at a building. The calculation applies regional grid-mix data and does not incorporate facility-specific power-purchase agreements or behind-the-meter generation, so it should not be presented as a universal value for every site. The methodology appears in the same LBNL report.
Local hydrology can make a smaller annual volume more consequential than a larger volume elsewhere. In a 2025 study, the Interstate Commission on the Potomac River Basin (ICPRB) reported a Washington metropolitan area estimate of about 4 million gallons per day (MGD) average and 15 MGD peak data-center consumptive use for 2025. Its 2050 baseline scenario projected about 22 MGD average and more than 80 MGD peak. These are Potomac-basin estimates and conditional scenarios, not measurements or forecasts for every region. The study shows why peak days, seasonality, drought and low-flow conditions matter.
What might nearby residents notice?
Water supply during peaks
A large customer can matter when a utility has little spare capacity, when several facilities cluster in one service area, or when evaporative demand rises during a hot, dry spell. Ask for monthly and peak-day withdrawals and consumption, not only an annual average. Then compare those figures with the utility’s firm capacity, drought plan, reservoir or aquifer conditions and projected demand from other customers.
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Wastewater and water quality
CRS says data centers commonly send wastewater to publicly owned treatment works. The wastewater’s characteristics depend on source-water quality, cooling technology and site operations. ICPRB identifies temperature, salinity, minerals and other contaminants from potential direct discharges as issues that may warrant study. That is a reason to examine permits and monitoring, not evidence that a particular facility will contaminate water.
Electric infrastructure and possible costs
New load can require generation, transmission, substations or local distribution upgrades. Who pays depends on utility tariffs, customer classes, contracts, regulation and negotiated arrangements. Fairfax County’s data-center information page says residents do not directly pay a data center’s electricity bill while noting that residents may bear part of infrastructure-improvement costs; Virginia has taken steps concerning cost allocation. Those are local arrangements, not a rule that applies everywhere. Residents should request the proposed allocation and protections against shifting project costs to other customers.
Noise and land-use conflicts
Fans, chillers, pumps and backup systems can operate continuously. Virginia’s Joint Legislative Audit and Review Commission (JLARC) reported that continuous low-frequency noise has affected some nearby residents, while many facilities generate no complaints because of location or design. It identified residential proximity and local zoning as planning concerns and stated: “The industrial scale of data centers makes them largely incompatible with residential uses.” Read the JLARC report for Virginia-specific findings.
Noise conditions should specify limits, frequencies, measurement locations, operating assumptions and a complaint process. A daytime-only limit may not address continuous overnight low-frequency sound. Setbacks, vegetated buffers, equipment orientation and enclosure requirements can matter as much as a single decibel number.
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Fairfax County reports data-center tax contributions to its general fund. The amount and distribution of benefits vary with local tax rules, incentives, assessed value, operating costs and public-service needs. Tax revenue is therefore a project-specific fiscal question, not a guaranteed offset for every community.
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What should residents ask before a facility is approved?
Request written answers in consistent units and for the same build-out stage. The following checklist turns a broad proposal into questions that can be verified in permits, utility filings and zoning conditions:
- Electricity: What is the expected demand at initial operation and full build-out? What is the annual load, maximum coincident load and expected growth by phase?
- Water quantities: What are expected monthly, seasonal and peak-day withdrawals and consumption? Are the figures modeled for hot-weather and high-compute conditions?
- Water source: Will water come from a public utility, reclaimed supply, surface water, groundwater or an on-site source? What happens during drought, low flows or peak summer demand?
- Cooling: Which air, liquid, closed-loop or evaporative systems will be installed? How do projected water and electricity use change under alternative designs?
- Wastewater: Where will wastewater go? Which treatment plant, discharge permit, monitoring requirements and public reports apply?
- Grid work: What generation, transmission, substation or distribution upgrades are needed? Who funds them, and what prevents costs from being shifted to other customers?
- Noise: What limits apply at nearby homes, at what frequencies and times? Where will measurements be taken, and how can residents file and resolve complaints?
- Enforcement: Which zoning buffers, water-use disclosures, construction conditions and expansion triggers are legally enforceable? What happens if actual use exceeds the application?
How can you compare two data-center proposals?
Compare like with like. Require both applicants to use the same time periods, weather assumptions, build-out stage and accounting boundaries, then examine:
| Comparison | Why it matters |
|---|---|
| Annual and peak electricity demand | Peak load can drive grid upgrades even when the annual average appears manageable. |
| Annual, monthly and peak-day water withdrawal and consumption | Seasonal stress is hidden by an annual average. |
| Potable versus reclaimed water | Reclaimed supply can reduce potable demand but does not eliminate consumptive use. |
| Cooling design | Water, electricity and noise trade-offs differ by technology and operating conditions. |
| Utility and wastewater capacity | A project may depend on upgrades or treatment capacity not yet funded. |
| Drought, seasonal and low-flow assumptions | Reliability during the most constrained periods is the key local test. |
| Grid-upgrade cost allocation | Contracts and regulation determine effects on other ratepayers. |
| Noise and distance to homes | Continuous low-frequency sound can be a siting issue even without frequent complaints. |
| Disclosure and mitigation terms | Public promises matter only when permits or zoning conditions make them enforceable. |
What are the main evidence limits?
There is no single standard data-center water profile. Providers may use municipal, reclaimed or self-supplied water, and disclosure rules differ. National estimates cannot predict a specific site’s withdrawals, consumption, discharge or effect on a utility. LBNL’s indirect-water estimate uses regional grid mixes rather than each facility’s electricity contracts or on-site generation. The Potomac figures are regional scenarios, and the Virginia noise and cost findings are examples from that jurisdiction.
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Interpret every proposal with those limits in mind. Ask for the underlying assumptions, require updates as each phase is built, and distinguish a modeled maximum from an average operating value. A permit that reports only annual totals leaves residents unable to evaluate the conditions most likely to stress water and electric systems.
How should a community judge the trade-off?
The right question is not whether all data centers are good or bad for residents. It is whether a particular project has a credible resource plan, a suitable site and enforceable protections. Reclaimed water may reduce pressure on potable supplies while still consuming water through evaporation. Lower-water cooling may increase electricity demand. Moving a facility farther from homes can reduce noise conflicts but may require longer utility connections. A sound decision weighs these trade-offs against local capacity, drought risk, land-use compatibility, infrastructure costs and the transparency of the conditions offered.
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For a proposed facility, the most useful public record will show peak as well as average electricity and water demand, the source and destination of water, cooling assumptions, grid and wastewater upgrades, noise controls, and who bears each cost. Without those details, a national statistic is context—not proof of what neighbors will experience.
Frequently Asked Questions
Does using reclaimed water eliminate a data center’s water impact?
No. Reclaimed water can reduce demand for treated potable supplies, but evaporative cooling still consumes water and the treatment and delivery systems use energy. Residents should ask how much reclaimed water is available during drought and what discharge remains.
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Some air-cooled designs can limit direct cooling-water consumption, but they still use electricity for fans and mechanical equipment. The proposal should identify the actual heat-rejection system rather than relying on a label such as “air cooling.”
Will a new data center automatically raise household electric bills?
Not automatically. The effect depends on the utility’s rate design, contracts, regulatory decisions and who pays for generation and grid upgrades. A project-specific cost-allocation filing is more informative than a general claim about rate increases.
Why do peak-day water numbers matter more than annual gallons?
Utilities must maintain service during the periods when demand and supply constraints coincide. A facility with a modest annual average can still create stress during hot weather, drought or low river flows if its peak consumption is large.
What can residents do if actual noise or water use exceeds the permit?
Use the permit’s designated complaint, monitoring and enforcement channels and keep dated records of observations. Ask local officials what reporting, corrective-action deadlines, penalties and expansion restrictions apply when measured conditions exceed approved limits.
