Land and data-center sites, North Carolina
Guides

Are data centers dangerous to live near?

The health and regulatory sources we opened do not state that living near a data center causes disease. They do rate some of what a campus holds as hazards, chiefly diesel exhaust. Whether a hazard reaches a home at a harmful level is an exposure question that permits model and few studies measure.

See how we check environmental records

Quick summary: This guide takes each health concern about data centers in turn: diesel exhaust, noise, power-line fields, battery and fuel fires, and water discharge. It is for residents and landowners near a proposed campus. The key point: a hazard is something that can cause harm, and exposure is how much of it reaches you. Health agencies rate hazards, and a project’s permits and studies estimate exposure.

Are data centers dangerous to live near?

No health or regulatory source we opened states that living near a data center causes illness. That is not proof of safety. A campus holds several hazards, and the record on how much of each reaches neighbors is thin.

Two terms carry this page.

  • Hazard. Something that can cause harm under some conditions. Health agencies classify hazards from the evidence.
  • Exposure. How much of a hazard reaches a person, how often, and for how long. Distance, equipment, run hours, and weather decide it.

The International Agency for Research on Cancer states that its categories refer only to the strength of the evidence that an exposure can cause cancer. They do not describe its potency. A hazard rating alone does not tell you the risk next door.

Concern What the primary source states What decides exposure
Diesel exhaust Carcinogenic to humans (IARC). Likely carcinogenic by inhalation (EPA). Run hours, engine type, controls, distance
Noise Not loud enough to damage hearing. Some residents report disrupted sleep (Virginia study). Equipment, layout, distance, terrain
Power-frequency fields Possibly carcinogenic (IARC). Weak association with childhood leukemia (NIEHS). Distance from lines and substations
Battery fire Thermal runaway releases hot, flammable, toxic gases (FEMA). Battery type, room design, fire response
Water discharge No health finding located. Treatment and the sewer operator’s permit

Diesel exhaust from backup generators

Diesel exhaust is the clearest hazard on a data-center site. In 2012, the International Agency for Research on Cancer classified diesel engine exhaust as carcinogenic to humans, based on sufficient evidence for lung cancer. Its release names power generators among the sources of everyday exposure. The EPA’s IRIS assessment calls diesel exhaust likely to be carcinogenic to humans by inhalation. It names chronic respiratory effects as the main noncancer hazard. It sets a reference concentration of 5 micrograms of diesel particulate matter per cubic meter of air.

The exposure side is narrower. Backup generators run during outages and for testing. Federal rules cap an emergency engine at 100 hours a year outside emergencies. For one Richmond County campus, the state air agency’s modeling found that toxic air pollutant emissions are not expected to violate health-based air quality levels. Those are model results. Data center generators: backup power and air permits explains run limits and bridge power.

What is unknown. The EPA found the data too uncertain to derive a cancer unit risk for diesel exhaust. It has no number that converts a dose into a cancer risk. We found no measured air study near a North Carolina campus in the records we read. Virginia’s air agency started a three-year monitoring study, according to a Virginia legislative study, because local effects are hard to model.

Do data centers cause cancer?

No source we opened links living near a data center to cancer. Two things on a campus carry cancer classifications. Diesel exhaust is carcinogenic to humans in the IARC scheme. Extremely low-frequency magnetic fields, the kind that power lines and substations make, are possibly carcinogenic to humans in the same scheme. IARC based that rating on limited evidence in humans for childhood leukemia. Both ratings describe the evidence for the hazard, not the dose at a given home.

Noise and sleep

Noise is the effect neighbors report most often in the public record we read. The Virginia study found that complaint-related data-center sound ranged from an estimated 40 to 59 decibels. It found the sound not loud enough to damage hearing and rarely loud enough to break local ordinances. Residents near those sites told the study about disrupted sleep, migraines, and trouble concentrating. The study reports those accounts. It did not measure health outcomes.

The constant hum, more than the volume, drives the complaints. Data-center noise, and why it now decides sites explains where the sound comes from and how distance changes it.

Power lines and substations

Magnetic fields from power lines drop off fast with distance. The National Institute of Environmental Health Sciences cites a World Health Organization example. A field of 57.5 milligauss beside a 230-kilovolt line measures 7.1 milligauss at 100 feet and 1.8 milligauss at 200 feet. The institute reports that studies of power-line fields found a weak association with childhood leukemia. The few studies of adults show no evidence of a link to adult cancers.

Many data-center sites have one or more substations on or beside the site, according to the Virginia study. The distance from new lines and substations to homes decides exposure. What a substation is and what it tells you about land covers the equipment.

Watch for: A hazard classification is not a measurement. When a hearing turns on health, ask for the run hours, the distance to the nearest home, and the permit or study that estimates exposure.

Battery and fuel fires

Data centers store energy and fuel on site. The federal design guide for data centers describes uninterruptible power supply systems that can be based on battery banks. Generators need fuel tanks. A FEMA case study states that lithium cells can experience thermal runaway, which releases very hot, flammable, toxic gases. In large storage systems, the failure of one cell can cascade to hundreds of cells, and the gases can cause an explosion.

That hazard falls first on workers and firefighters. Exposure for neighbors depends on battery chemistry, room design, separation, and the fire response plan. Ask the local fire marshal what the fire code requires for the battery rooms and fuel tanks. A campus that stores diesel above ground can also fall under federal spill-prevention rules, which exempt a site whose aboveground oil storage totals 1,320 gallons or less.

Water discharge

Cooling towers drain water that carries concentrated minerals, called blowdown. When a campus sends that water to a public sewer, the state pretreatment program applies. The sewer operator controls industrial discharge through its sewer use ordinance and industrial user permits. The program aims to prevent pass-through, interference, and other harm to the treatment plant, its workers, and the environment.

At a 2026 county hearing on a data-center pause, speakers raised PFAS as a concern. We found no health or regulatory source that measures PFAS in data-center cooling discharge. That concern needs equipment, discharge, and monitoring data before anyone can test it. Data center water usage: what it means for a site covers blowdown and sewer capacity.

Take action: If you own land near a proposed campus, learn which parts of the project sit closest to your tract before the hearing. Start with Is your parcel FOUND?

What is still unknown

The public record leaves four health questions open.

  • Measured air near homes. We found no air measurements at homes near a North Carolina campus during generator tests.
  • A dose-response number for diesel exhaust. The EPA did not derive a cancer unit risk.
  • Long-term health studies of neighbors. We found none in the primary sources we opened.
  • Contaminants in discharge. We found no monitoring data on PFAS or other contaminants in data-center cooling discharge.

The air agency, the local health department, the sewer operator, and the fire marshal each answer the part they regulate. Are data centers bad? The objections, checked against the record covers the objections beyond health.

Key recap

  • No health or regulatory source we opened states that living near a data center causes illness. The record on exposure is thin.
  • Diesel exhaust is the clearest hazard. IARC classifies it as carcinogenic to humans, and the EPA calls it likely carcinogenic by inhalation.
  • Generator exposure depends on run hours, engine type, and distance. North Carolina’s permit findings rest on models, not on measured air at homes.
  • Noise complaints in Virginia involved sound below most ordinance limits. Residents reported disrupted sleep, but the study did not measure health outcomes.
  • Power-line fields, battery fires, and water discharge are real hazards whose exposure depends on design and distance.

Questions

Are data centers bad for your health?

No health or regulatory source we opened states that they are. A campus holds hazards, chiefly diesel exhaust from generators. The health effect on neighbors depends on exposure. The project’s air permit models that exposure, and no record we read measures it.

Do data centers cause cancer?

No source we opened links living near a data center to cancer. Diesel exhaust is classified as carcinogenic to humans, and power-frequency magnetic fields as possibly carcinogenic. Those ratings describe evidence for the hazard, not the risk at a given distance.

Is it safe to live near a data center substation?

Magnetic fields fall off quickly with distance from lines and substations. Federal health researchers report a weak association with childhood leukemia and no evidence of a link to adult cancers. Ask the utility for the field levels it expects at your property line.

References

Primary sources cited on this page, in APA style.

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