Yes, you should care about radon. Radon is a naturally occurring radioactive gas that seeps into homes from the soil, and it is the second-leading cause of lung cancer in the United States after smoking, according to the EPA. The only way to know if your home has a problem is to test and if levels reach or exceed 4.0 pCi/L, the EPA recommends mitigation.
What Is Radon, and Why Does It Matter?
Radon gas forms when uranium in soil and rock breaks down. It is colorless, odorless, and tasteless, which means you cannot detect it without a test. It enters homes through foundation cracks, sump pits, and gaps around pipes, then builds up in enclosed spaces like basements and lower levels.
The World Health Organization classifies radon as a Class A human carcinogen. The EPA estimates radon causes about 21,000 lung cancer deaths every year in the U.S. Long-term exposure not a single event drives the risk, so the danger builds quietly over months and years of breathing contaminated indoor air.
Wisconsin sits in a region with elevated natural uranium deposits, which raises baseline radon risk across Milwaukee-area neighborhoods. Homes in Whitefish Bay, Wauwatosa, West Allis, and South Milwaukee commonly test above the EPA action level, regardless of the home’s age or construction quality.
How Do I Know If I Should Care About Radon in My Home?
You should care about radon if you live in a home with any level of basement or ground contact, which describes nearly every house in southeastern Wisconsin. Radon risk has nothing to do with how new, clean, or well-built a home is it depends entirely on the geology beneath it.
Signs that make testing more urgent include:
- A home built directly on or below grade
- Cracks in the foundation slab or walls
- A sump pit without a sealed lid
- Neighboring homes with known high radon readings
- No radon test on record in the past two years
Since radon produces no physical symptoms until disease develops, the symptoms of radon exposure typically don’t appear until lung damage is already underway. Testing is the only reliable way to catch a problem early.
What Is the EPA Action Level for Radon?
The EPA action level is 4.0 pCi/L (picocuries per liter of air). If a test confirms your home is at or above this threshold, the EPA and the U.S. Surgeon General recommend installing a mitigation system. Even levels between 2.0 and 4.0 pCi/L carry measurable risk, and the EPA notes that no level of radon exposure is completely safe.
Picocuries per liter measure the rate of radioactive decay in the air you breathe. The average U.S. indoor level is about 1.3 pCi/L, while outdoor air averages 0.4 pCi/L. Homes tested in the Milwaukee area frequently return results well above the national indoor average.
How Do I Test My Home for Radon?
You can test your home with a short-term or long-term test kit, or by hiring a certified radon measurement professional. Short-term tests run 2–7 days and give a quick snapshot; long-term tests run 90 days or more and provide a more accurate annual average, since radon levels fluctuate with weather, season, and ventilation.
If you’re unsure where to start, should I get a radon test walks through the decision in more detail. As a general rule, test every two years, after any foundation work, and before buying or selling a home.
What Happens If My Radon Level Is High?
If your radon level tests at or above 4.0 pCi/L, the next step is mitigation not panic. The most common and effective method is sub-slab depressurization, a system that uses a radon fan to draw gas from beneath the foundation and vent it safely outside before it enters your living space.
A properly installed system typically reduces radon levels by 80–99%. You can learn more about how a radon mitigation system works and what installation involves for different foundation types.
Should Mitigation Be a DIY Project?
No. Radon mitigation should always be performed by a certified professional. The American National Standards Institute (ANSI) and the American Association of Radon Scientists and Technologists (AARST) set the technical standards that certified mitigatory follow, and certification through the National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB) confirms a contractor meets them.
Improperly installed systems can fail to reduce radon, create negative pressure problems elsewhere in the home, or violate local building codes. If you’re vetting contractors, how to hire certified radon mitigation outlines the credentials and questions to check before signing a contract.
How Much Does Radon Mitigation Cost?
Most residential radon mitigation systems cost between $800 and $2,500, depending on foundation type, home size, and fan placement. This is a one-time installation cost, and systems require only periodic inspection afterward typically an annual check to confirm the fan and system are still functioning correctly. For a full cost breakdown, see how much radon testing and mitigation costs.
Frequently Asked Questions
Is radon really dangerous, or is this overstated?
Radon is not overstated. It is the leading cause of lung cancer among non-smokers and the second-leading cause overall, according to the EPA and WHO.
The risk is well-documented through decades of epidemiological research on uranium miners and residential exposure studies.
Can radon levels change over time?
Yes. Radon levels shift with seasons, barometric pressure, soil moisture, and even home renovations. A home that tested low five years ago can test high today, which is why the EPA recommends retesting every two years.
Does homeowners insurance cover radon testing or mitigation?
Typically, no. Radon testing and mitigation are considered preventive maintenance, not damage repair, so most standard homeowners policies exclude them. Some state or utility programs offer testing rebates check your local radon program for availability.
Is a radon level under 4.0 pCi/L completely safe?
Not entirely. The EPA states there is no known safe level of radon exposure, but 4.0 pCi/L is the threshold at which the health risk clearly justifies the cost of mitigation. Homes between 2.0 and 4.0 pCi/L may still benefit from reduction.
How long does radon mitigation installation take?
Most systems are installed in a single day, typically 4–6 hours, depending on foundation complexity and fan placement.
Conclusion
Caring about radon isn’t optional if you own a home in the Milwaukee area it’s a basic health and safety measure, the same as checking smoke detectors or testing for carbon monoxide. Testing is inexpensive, mitigation is a proven fix, and both are backed by decades of EPA and WHO research.
If you haven’t tested your home in the last two years, or you’ve never tested at all, now is the time. Milwaukee Radon Mitigation provides certified radon testing and mitigation services throughout Whitefish Bay, Wauwatosa, West Allis, and South Milwaukee. Call (414) 455-7279 to schedule a test or consultation.
