Fact vs Fiction About Radon
About Radon
Fiction: “Radon only gets into some homes.”
Fact: Radon gets into every home. It moves through small openings in the foundation, floors, and walls.
Learn more.
Fiction: “You can usually tell if your home has radon.”
Fact: You can’t sense radon. There are no symptoms, smells, or warning signs — only a test can confirm your level.
Learn more about testing.
Fiction: “It only takes one test to determine radon levels.”
Fact: EPA requires a follow‑up test before making any mitigation decision. Radon levels change from day to day, so one test is only a snapshot—not a reliable measure of your home’s true long‑term level.
Learn more.
Fiction: “Anything above 2.7 pCi/L is dangerous.”
Fact: The U.S. mitigation threshold is 4.0 pCi/L. The 2.7 number is often used in mitigation marketing, not in national policy.
Learn more.
Fiction: “Radon is an immediate danger.”
Fact: Radon is a long‑term exposure risk, not an emergency. For most never‑smokers, the odds of lung cancer at typical household levels are real but modest, and they build slowly over many years.
Read our take.
About Radon and Cancer Causation
Fiction: “Doctors can tell a cancer was caused by radon because of how it looks.”
Fact: Tumors caused by different exposures look the same under a microscope. Radon does not create a unique pattern of small cell, squamous, or adenocarcinoma that lets a doctor identify it as the cause.
Fiction: “Radon cancers have a special mutation pattern or biological fingerprint.”
Fact: Radon leaves no distinct molecular signature. The DNA damage it causes overlaps with smoking, air pollution, and other carcinogens, so no biopsy, scan, or genetic test can show that radon caused an individual person’s cancer.
Fiction: “People on television say they’re certain their cancer was caused by radon, so doctors must know.”
Fact: Personal stories reflect what people believe about their own experience, but they cannot establish medical causation. Radon’s effect only becomes visible in large‑population studies—not in the biology of one tumor.
Fiction: “If someone lived in a high‑radon home, doctors can tell their cancer was radon‑induced.”
Fact: Exposure history shows risk, not cause. EPA research can estimate the probability that radon contributes to lung‑cancer rates in a population, but there is no biological test that can confirm radon caused an individual person’s cancer—even when their exposure was high.
About Mitigation
Fiction: “Mitigation is a cure.”
Fact: Mitigation reduces radon, often dramatically, but it does not eliminate all radon or guarantee permanent results.
Learn more about mitigation.
Fiction: “A mitigation plan and bid can be developed without an in‑person inspection.”
Fact: Every home is different. A proper system requires a site‑specific evaluation, not a one‑size‑fits‑all design.
Learn why inspections are required.