Living Near a Data Center: What to Know About EMF and Power Infrastructure

Data centers are drawing a growing share of U.S. electricity. By 2030, Lawrence Berkeley National Laboratory projects that they will account for 11.8% of U.S. electricity use. Pew Research Center reports that 38% of Americans already live within five miles of an operating data center.

If a data center is planned near you, it is reasonable to ask what that could mean for EMF around your home. The key variable, however, is not necessarily distance to the data center itself, but distance to the power infrastructure serving it.

Where does the EMF actually come from?

For someone living near a data center, the relevant EMF can come from several parts of the electrical system serving it, not necessarily from the building itself. These include transmission and distribution lines, substations, transformers, buried cables, and electrical equipment inside the facility. For neighboring homes, the lines, cables, and substations carrying power to the site may matter more than equipment inside the building.

Diagram: from data center to home. Power runs from the data center through electrical equipment or a substation and along overhead lines or buried cables to the home. Current, conductor layout, distance and room location shape the field at home.

The important point is that the layout of that power system varies from project to project. One data center may connect to an existing substation well away from nearby homes; another may require a new line, transformer, substation, or buried cable much closer to them. So two homes the same distance from a data-center building could have very different relationships to the infrastructure carrying its power.

That infrastructure produces both electric and magnetic fields. Electric fields come from voltage; magnetic fields come from current. For nearby homes, magnetic fields are usually the more useful one to track because they pass through walls and other common building materials more readily. That is the field we focus on from this point forward.

Why distance and layout change what reaches your home

Once you know which part of the power system matters, the next question is how much of its magnetic field reaches your home. Any wire or cable carrying current produces a magnetic field that extends into the space around it and weakens with distance. It does not stop at a fence or property line, which is why a power line or cable outside the home can contribute to readings inside.

Distance is only part of the story. A transmission line contains several conductors, each producing its own magnetic field. Their fields overlap, and conductor spacing and arrangement affect the combined field around the line. Some configurations cancel more of the individual fields than others. The height of overhead lines, or depth and arrangement of buried cables, also changes their distance from a nearby home.

NIEHS gives a useful example from a 230-kilovolt transmission line. Magnetic-field strength, which measured 57.5 milligauss close to the source, fell to about 7.1 milligauss at 100 feet and 1.8 milligauss at 200 feet. Although those figures are specific to this example, they show why distance from the actual source matters more than distance from the data-center property line.

One transmission line, three very different readings: in an NIEHS example for a 230 kV line, the magnetic field measured 57.5 mG close to the line, 7.1 mG at 100 feet and 1.8 mG at 200 feet.

Around many substations and transformers, fields fall back toward typical household background levels within several meters, according to ARPANSA. With larger transmission substations, however, the high-current overhead lines and underground cables entering and leaving the site can matter as much as the equipment inside the fence.

Underground cables still produce magnetic fields because they carry current. Burying a cable changes its position and conductor arrangement; it does not eliminate the field. Readings can therefore be relatively high directly above a buried cable while falling more quickly to either side.

What does the health research say?

If a magnetic-field reading near your home is higher than expected, the next question is what that might mean for health. The answer is less clear than the measurement: whether long-term residential exposure at relatively low levels causes disease remains uncertain.

The International Agency for Research on Cancer classifies extremely low-frequency magnetic fields as “possibly carcinogenic to humans” (Group 2B), based on limited evidence around childhood leukemia. A more recent European review described that association as weak; evidence concerning neurodegenerative disease was uncertain to weak. Researchers have not established a clear biological mechanism.

A large Swiss cohort study published in 2026 followed more than 3.5 million adults and found that higher modeled exposure to magnetic fields from high-voltage power lines was associated with higher mortality from Alzheimer’s disease and other dementias. Fewer than 1% of participants had modeled long-term exposure of 0.3 µT or more from high-voltage lines.

The study found no associations with ALS, Parkinson’s disease, or multiple sclerosis, and the authors cautioned that it does not establish causation.

What do exposure guidelines actually tell you?

Official exposure guidelines can help put an EMF reading in context, but they do not answer every health question and should not be treated as a simple dividing line between “safe” and “unsafe” long-term exposure.

The ICNIRP reference level for a 50 Hz magnetic field is 200 microtesla, or 2,000 milligauss, based on established short-term effects on the nervous system. It does not mean every possible long-term effect below that level has been ruled out. The EPA also notes that the United States has no federal standard limiting residential exposure to power-line EMF.

So a household reading cannot be interpreted against one universal cutoff. Exposure guidelines answer one part of the question; research into possible long-term health effects remains less certain. That distinction is central to the broader question of whether EMF is harmful.

What can a measurement at home actually tell you?

A home measurement tells you how strong the magnetic field is at a particular place and time. It can show whether levels vary between rooms or through the day, and whether there is a pattern worth investigating. A single reading cannot tell you whether the field poses a health risk or exactly which source produced it.

How should you measure?

If the concern is power-frequency magnetic fields, use a low-frequency magnetic-field meter. It measures something different from an RF or plug-in dirty-electricity meter. Readings are commonly expressed in microtesla (µT) or milligauss (mG), with 1 µT equal to 10 mG.

Where and when you measure matter too. Fields vary across a room and as electrical loads change. ARPANSA recommends measuring where people spend time and repeating measurements through the day rather than relying on one snapshot.

One reading is a snapshot; repeated readings show more. Compare the bedroom, desk and living area in the morning, afternoon and evening instead of relying on a single number.

That matters near a data center because current in the surrounding power infrastructure can change with facility demand and wider grid conditions. Repeated readings can show whether a pattern is consistent or temporary. Before attributing it to new infrastructure, it also helps to understand the electrical and wireless sources already present inside a typical home.

What can you do if a data center is planned near your home?

If a data center is planned near your home, focus first on the electrical infrastructure, the sources closest to where you spend time, and what can be measured directly.

  • Start with the electrical plan, not just the building plan. Site plans and utility, interconnection, transmission, or substation filings can show whether the project requires new lines, buried cables, a substation, or upgrades to existing infrastructure.
  • Look at distance from the actual sources. A data-center entrance may be relatively close while the substation and power corridor sit much farther away, or the reverse. Property-line distance alone is not a useful proxy for magnetic-field strength.
  • Measure where you spend time. Focus on bedrooms, desks, living areas, and other regularly occupied spaces, and repeat readings at different times. If a source produces a higher field on one side of a room, increasing distance can reduce its contribution.
  • Keep electrical safety separate from EMF questions. Unusual buzzing, overheating, frequently tripped breakers, damaged wiring, or suspected installation faults should be assessed by a qualified electrician. Do not alter grounding or neutral connections in an attempt to change EMF readings.

What if your readings stay higher than expected?

If repeated measurements show a consistent pattern, particularly in rooms you use often, the next step is to identify the source and what you can actually change. A higher reading is a reason to investigate further, not a health diagnosis or proof that the data center is responsible.

Confirm where the field is coming from

Compare readings across rooms, times of day, and distances from the suspected source. If the pattern could affect a property decision or other significant concern, a professional survey or time-logging meter can provide a stronger record than a handful of spot measurements.

Also rule out sources inside the home. Household wiring, service panels, appliances, and wiring faults can contribute to low-frequency magnetic fields. If a higher reading falls as you move away from a wall, circuit, appliance, or electrical panel, the source may be much closer than the data-center infrastructure.

Use distance where you can

If an identifiable source is contributing to the field, increasing your distance from it is often the simplest practical step. That might mean moving a bed, desk, or frequently used chair farther from one side of a room, or using a different room for activities that keep you in the same place for long periods.

The useful distance depends on the source and the layout of the home, so there is no universal setback number. Compare readings before and after a realistic change to see whether the field falls.

Know when the solution sits outside the home

If repeated measurements point toward a transmission line, buried cable route, transformer, or substation serving the development, the most meaningful changes may have to occur at the infrastructure level. Routing, distance from homes, conductor arrangement, and other engineering decisions can all affect the magnetic field around power infrastructure.

For a planned project, public site plans, utility filings, and local permitting processes are especially useful. They can show where new electrical infrastructure will sit relative to nearby homes and may provide an opportunity to ask questions before the final configuration is fixed.

If the infrastructure is already in place and the readings are significant enough to affect how you use the property, a qualified electrical or EMF professional can help determine whether further mitigation is realistic. Shielding very-low-frequency magnetic fields is a specialized engineering problem.

Putting data center EMF in context

If you live near a data center, there is no single, predictable “data center EMF” exposure. What matters is the path from source to home: which conductors carry current, how they are arranged, how far away they are, and what is measured where you spend time.

That makes the issue more practical than the label “data center EMF” suggests. Identify the relevant power infrastructure, understand the field you are measuring, and focus on the environment that actually exists. Research cannot provide a universal setback distance or one number that settles every health question, but it can show you what to look for and how to investigate it.

Back to blog