Data centers can affect nearby communities through water used for cooling, electricity demand that may require grid upgrades, and air pollution from generators or power plants. The size of each impact depends on the facility’s cooling system, water source, local grid and utility rules, and how its generators are used. Residents do not automatically pay every cost or face the same effects wherever a data center is built.
How a data center’s local impacts arise
A data center concentrates computing equipment in a facility that needs reliable electricity and must remove heat. Those needs create three connected pathways:
- Water: A facility may use water on site for cooling. The electricity it consumes may also require water at power plants, even when the data center itself uses little water.
- Electricity and bills: The facility pays for the electricity it consumes, while new demand can also require utility infrastructure. Who pays for that infrastructure depends on whether it is dedicated to a customer or shared, and on local rate rules.
- Air quality: Backup generators can emit pollutants when they run. Electricity generation can produce emissions off site, and some facilities may use on-site generation routinely.
These are pathways, not a prediction that every data center will produce the same local outcome. For a particular community, cooling design, climate, water source, grid mix, generator operation, permits, utility rates, and infrastructure funding all matter.
What a data center’s electricity demand means for local bills
Growing demand is a national projection, not a local measurement
Lawrence Berkeley National Laboratory’s Energy Technologies Area summarizes a 2025 U.S. report that projects data centers could account for 9.5% to 15.3% of total U.S. electricity use by 2030. That is a forecast range for the country, not a measured share for any particular town or utility territory. The range itself signals uncertainty about how demand will grow. Lawrence Berkeley National Laboratory, Energy Technologies Area
Local effects depend on where the new load connects and whether existing grid capacity can serve it. A utility may need generation, transmission, or other grid improvements; a project may also require facilities serving a particular customer. The existence and cost of those investments are local questions, not conclusions that can be drawn from a national electricity forecast.
Do residents pay the cost of increased energy demand by data centers?
Sometimes residents may bear part of the cost of shared grid improvements, but they do not automatically pay the data center’s electricity bill. The outcome depends on utility rate design and how costs are assigned between the customer that creates demand and other customers who use shared infrastructure.
In Virginia, the Joint Legislative Audit and Review Commission (JLARC) found that current rates appropriately allocate current costs to the customers responsible for them, including data centers. Fairfax County likewise says residents do not directly pay for electricity consumed by data centers, but may pay a portion of energy-infrastructure improvements needed for increased demand. The county notes that rates depend on usage and customer class and are reviewed by the Virginia State Corporation Commission. These findings describe Virginia; they do not establish how every state or utility allocates costs. Virginia JLARC, Data Centers in Virginia (2025); Fairfax County, “Data Centers”
Are data centers the reason the cost of electricity is increasing?
No single cause explains electricity-price changes, and data centers are not the sole reason for increased electricity costs. Fairfax County makes that point while distinguishing the electricity a data center uses from the cost of grid improvements that may be shared. Whether data-center demand contributes to costs for other customers depends on the local utility’s investments and cost-allocation rules; the available Virginia findings do not justify a blanket answer for all utilities.
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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11JLARC also identifies a possible future risk in Virginia if enough large customers leave incumbent utilities for retail choice and shift generation costs. That is a risk the report describes, not a finding that such a shift has already raised every household’s bill. To assess a specific proposal, look for utility rate and cost-allocation filings, the project’s expected load, planned grid work, and any contracts or customer-class arrangements. Virginia JLARC, Data Centers in Virginia (2025)
How data centers can affect local water supplies
On-site cooling is only one part of the water footprint
Water use at a facility varies with its size, computing density, and cooling system. As Virginia JLARC puts it: “The amount of water a data center uses depends on its size, computing density, and type of cooling system.” Many facilities receive water from local utilities that draw on rivers or groundwater, but water availability differs by locality. Statewide conditions therefore cannot settle whether a particular watershed or water system has capacity for a new facility. Virginia JLARC, Data Centers in Virginia (2025)
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Cooling design can make a substantial difference to direct water demand. Fairfax County reports that roughly 40% of regional data centers rely on air cooling rather than water-based cooling. That figure describes Northern Virginia, not facilities everywhere; it also does not establish the water use of any individual site. Fairfax County, “Data Centers”
Indirect water use occurs where electricity is generated
Water used to generate electricity is separate from water withdrawn or consumed at the data center. A 2025 assessment by Next 10 and University of California, Riverside researchers estimated California data centers’ operational water consumption and electricity consumption as follows:
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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →| California estimate | 2019 | 2023 |
|---|---|---|
| Operational water consumption | 25.42 billion liters | 49.91 billion liters |
| Electricity consumption | 5.54 TWh | 10.82 TWh |
The assessment attributes more than 90% of California’s estimated operational water footprint to off-site water consumption associated with electricity generation. Its totals and share are California-specific estimates that reflect assumptions about the region’s power generation; they should not be treated as water consumed from a host community’s municipal system or transferred to another state. Next 10 and University of California, Riverside researchers, An Assessment of California Data Centers’ Environmental and Public Health Impacts (2025)
Local water figures need a geographic label
For Northern Virginia’s Potomac River basin, Fairfax County cites an Interstate Commission on the Potomac River Basin estimate that data centers use less than 100,000 gallons per day. The county says that is less than 0.1% of the region’s 100 million gallons of upstream consumptive water use. These figures apply to that basin and region; they do not show that water is unconstrained at every site or that the same share applies elsewhere. Fairfax County, “Data Centers”
Fairfax County says precise countywide data-center water use has been difficult to determine because the data have been private. The county expects additional information after Virginia’s water-reporting requirements take effect in 2027. Until site and utility records are available, a regional estimate cannot substitute for a facility’s withdrawals, consumption, source, or peak demand. Fairfax County, “Data Centers”
What data centers can mean for local air quality
Backup generators are an on-site source
Diesel backup generators emit pollutants including nitrogen oxides, carbon monoxide, and particulate matter. How much they contribute depends on their operation and permits. Virginia JLARC says Tier 2 generators are generally limited to emergencies and maintenance tests, and that Virginia permits constrain generator operation, duration, and annual emissions. Those limits do not make emissions zero, and a regional estimate cannot rule out a site-specific effect.
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For Northern Virginia, JLARC estimated data-center diesel generators account for less than 4% of regional nitrogen oxide emissions and 0.1% or less of regional carbon monoxide and particulate matter emissions. These are regional estimates, not measurements of exposure at every facility or nearby home. JLARC also says state regulators are studying possible local effects. Virginia JLARC, Data Centers in Virginia (2025)
Power plants can produce emissions away from the facility
Grid electricity can cause emissions at power plants, so the relevant air impacts are not limited to a data center’s property line. The scale depends in part on the local power mix. Some sites may also use on-site fossil generation for regular power, which is distinct from emergency backup. California’s assessment includes on-site diesel backup generators and off-site electricity production in its public-health analysis; its historical estimates and projections concern California and are not universal local exposure estimates. Next 10 and University of California, Riverside researchers, An Assessment of California Data Centers’ Environmental and Public Health Impacts (2025)
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to assess a data-center proposal in your area
Ask for evidence tied to the site and reporting period, and distinguish measured operating data from modeled estimates or projections. These records help answer different parts of the question:
- Water: What cooling system is proposed? What are the projected annual and peak withdrawals and consumption? What is the water source, is reclaimed water used, and what do the utility’s reports and permits say about watershed conditions and capacity?
- Power and bills: What load does the project forecast? What grid capacity or new transmission and generation would be needed? Which infrastructure is dedicated to the facility, which is shared, and how do the utility’s rate filings or contracts assign those costs among customer classes?
- Air: What fuel do backup generators use, how often are they tested or dispatched, and what do air permits allow? Is there routine on-site generation? What local monitoring is available, and what is the relevant power mix for off-site emissions?
- Evidence quality: Is a figure measured, modeled, or forecast? Does it cover one facility, a region, or an entire state? Which year does it describe, and what information remains undisclosed?
Useful records include utility rate and cost-allocation filings, water-utility reports and permits, facility cooling and withdrawal data, air permits, generator run records, and ambient monitoring. A regional statistic can provide context, but it cannot answer every site-specific question.
Why electricity comparisons need a full system boundary
Data-center demand should not be treated as wholly additional without considering whether digital activity replaces other electricity-using activity. The UK Department for Energy Security and Net Zero’s 2025 analysis included data centers, network transmission, and end-user devices, then compared that digital delivery chain with physical alternatives. In its three studied cases—video streaming versus Blu-ray, eBook reading versus printed books, and AI translation versus human translation—the digital option matched or used less electricity under the report’s assumptions. Those comparisons do not settle a community’s water, utility-bill, or air-quality impacts; they illustrate why conclusions depend on what activities and equipment are counted. UK Department for Energy Security and Net Zero, Impact of growth of data centres on energy consumption (2025)
For a broader state-policy overview, Colorado Legislative Council Staff published a memorandum on data-center impacts on the environment, public health, and energy costs on March 9, 2026. A policy overview can help frame questions, but a local answer still depends on facility, utility, water, and air records for the place in question. Colorado Legislative Council Staff, Data Center Impacts on the Environment, Public Health, and Energy Costs (March 9, 2026)
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