Radon FAQ
Find answers to the most common questions about radon testing, health risks, mitigation, products, and hiring a qualified contractor. Select a category below to get started.
Radon Testing
When should I test my home for radon?
Every home should be tested for radon, regardless of location or age. The EPA recommends testing during the buying or selling process, after major renovations, and at least every two years. Winter months with closed windows often yield the most accurate results since indoor air is less diluted.
How long does a radon test take?
Short-term radon tests typically run for 2 to 7 days, while long-term tests measure radon levels over 90 days to a full year. Short-term tests give a quick snapshot, but long-term tests provide a more accurate annual average since radon levels fluctuate seasonally.
What is the difference between short-term and long-term radon tests?
Short-term tests use charcoal canisters or electret ion chambers and measure radon over 2 to 7 days. Long-term tests use alpha track detectors and measure over 90 days or more. Short-term tests are useful for quick screening, but long-term tests give a more reliable picture of your actual year-round exposure.
Should I use a DIY radon test kit or hire a professional?
DIY test kits are affordable ($15 to $40) and work well for initial screening. Professional testing costs $150 to $300 but uses calibrated equipment and follows strict protocols. For real estate transactions, most states require professional testing. For routine home monitoring, a quality DIY kit is usually sufficient.
How often should I retest my home for radon?
The EPA recommends retesting every two years, even if previous results were low. You should also retest after installing a mitigation system, after major structural changes like adding a foundation crack repair, or if you move to a different level of your home. Continuous digital monitors can provide ongoing peace of mind.
Radon Health Risks
Is radon dangerous?
Yes. Radon is the second leading cause of lung cancer in the United States, responsible for an estimated 21,000 deaths per year according to the EPA. It is a radioactive gas that decays into particles which can damage lung tissue when inhaled over time. The risk increases with higher concentrations and longer exposure.
What is the EPA action level for radon?
The EPA recommends taking action to reduce radon levels at or above 4 pCi/L (picocuries per liter). However, the EPA also notes that no level of radon is completely safe and encourages homeowners to consider mitigation even between 2 and 4 pCi/L. The World Health Organization sets a lower reference level of 2.7 pCi/L.
What are the symptoms of radon exposure?
Radon exposure has no immediate symptoms. You cannot see, smell, or taste radon. Long-term exposure may contribute to persistent cough, shortness of breath, chest pain, and frequent respiratory infections. Because symptoms only appear after years of exposure, testing is the only way to know if your home has elevated levels.
Who is most at risk from radon exposure?
Smokers exposed to elevated radon levels face the highest risk — their lung cancer risk is up to 10 times greater than nonsmokers with the same radon exposure. Children may also be more vulnerable due to their higher breathing rates. People who spend more time in lower levels of the home, where radon concentrations are typically highest, face greater exposure.
Radon Mitigation
What is radon mitigation?
Radon mitigation is the process of reducing radon gas concentrations in a building. The most common method is sub-slab depressurization, which uses a vent pipe and fan to draw radon from beneath the foundation and exhaust it above the roofline. Other methods include sealing foundation cracks, installing crawl-space encapsulation, and improving ventilation.
How much does radon mitigation cost?
Most residential radon mitigation systems cost between $800 and $2,500, with the national average around $1,200. The price depends on your home's foundation type, size, and local labor rates. Homes with complex foundations or multiple slabs may cost more. The system typically pays for itself in health protection and preserved property value.
How long does radon mitigation installation take?
A professional radon mitigation system can usually be installed in 4 to 8 hours for a standard home. More complex installations involving multiple suction points or difficult-to-access foundations may take a full day. After installation, you should wait at least 24 hours before running a follow-up radon test.
Does radon mitigation affect home value?
Yes, having a radon mitigation system can positively affect home value. Many buyers see an installed system as a sign of proactive home maintenance. In areas with known radon issues, homes without a mitigation system may face price negotiations. A working system with documented test results below 4 pCi/L gives buyers confidence.
Can I install a radon mitigation system myself?
While DIY radon mitigation is technically possible, it is not recommended for most homeowners. Proper installation requires knowledge of building science, correct fan sizing, and local code compliance. An improperly installed system can be ineffective or even increase radon levels in some areas of the home. Hiring a certified professional ensures the job is done safely.
Radon Products
What type of radon test kit is best?
For a quick screening, short-term charcoal canister kits are affordable and widely available. For a more accurate reading, alpha track long-term kits provide a better annual average. If you want ongoing monitoring, a digital radon detector offers continuous readings and alerts. The best choice depends on whether you need a one-time snapshot or long-term data.
Are digital radon monitors worth the investment?
Digital radon monitors are worth it for homeowners who want continuous, real-time radon data. They typically cost $150 to $300 and track radon trends over time, which helps you understand seasonal fluctuations. Models like the Airthings Corentium Home and EcoQube are popular choices. They pay for themselves by eliminating the need for repeated single-use test kits.
Do I need a radon mitigation fan?
You need a radon mitigation fan if your home has radon levels at or above 4 pCi/L and you are installing an active sub-slab depressurization system. The fan creates the suction that pulls radon from under your foundation. Fan selection depends on the soil type and number of suction points. Replacement fans are also needed when an existing fan fails.
Finding a Radon Contractor
What certifications should a radon contractor have?
Look for contractors certified by the National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB). These certifications require passing an exam, meeting continuing education requirements, and following industry standards. Many states also require a state-specific radon license. Always ask to see proof of certification before hiring.
How many quotes should I get for radon mitigation?
Get at least three quotes from certified radon contractors. This gives you a fair comparison of pricing, methods, and warranties. Be cautious of quotes significantly below market rate, as they may indicate shortcuts. Each quote should include the mitigation method, warranty terms, post-installation testing, and a guarantee to reduce radon below 4 pCi/L.
What questions should I ask a radon contractor?
Ask about their certification (NRPP or NRSB), years of experience, the specific mitigation method they recommend for your home, warranty terms, whether post-installation testing is included, and references from past customers. Also ask about their guarantee — reputable contractors guarantee reducing radon below 4 pCi/L or will return to adjust the system at no extra charge.
Reviewed by
FindRadonPros Editorial Team
Our editorial team consults with NRPP- and NRSB-certified radon professionals to ensure accuracy. Content is reviewed against EPA guidelines and updated regularly as standards evolve.
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