Homebuyers can see a damaged roof shingle or a leaking faucet. Radon is different. It is a naturally occurring radioactive gas that is invisible and odorless, and its concentration can vary from one property to another. The only practical way to know a home’s radon level is to test.
The U.S. Environmental Protection Agency identifies radon as a serious indoor-air risk and estimates that it is the leading cause of lung cancer among people who do not smoke. That makes accurate, properly controlled testing an important consideration during a home purchase – not a reason to panic or abandon an otherwise suitable property.
How radon enters a home
Radon comes from the natural breakdown of uranium in soil, rock, and water. Differences in soil, construction, pressure, weather, foundation design, and ventilation can affect how it moves into a building.
Potential entry routes include cracks and joints in foundation materials, openings around utility penetrations, floor drains, crawlspaces, sump areas, and other connections between the building and the ground. A newer home is not automatically radon-free, and a neighbor’s result cannot predict the exact level in another house.
Why testing matters during a real-estate transaction
Real-estate deadlines often require a shorter testing period than a homeowner might use for long-term monitoring. A professional radon test in Huntsville should follow the device instructions and applicable testing protocol so the result is useful for the transaction.
The test area, placement, building conditions, weather events, HVAC operation, and interference can all affect the measurement. Closed-building conditions are commonly required for a defined period before and during a short-term test. Doors and windows should not be left open beyond normal entry and exit, and the device should not be moved or disturbed.
Ask the testing professional to explain:
- Which device will be used
- Where it will be placed
- How long the test will run
- Required building conditions
- Whether the monitor checks for possible interference
- When and how the result will be delivered
- What follow-up is recommended for an unusual or elevated result
Understanding pCi/L and the EPA action level
Radon concentration in the United States is commonly reported in picocuries per liter of air, abbreviated pCi/L. EPA recommends fixing a home when the result is 4 pCi/L or higher and advises homeowners to consider action for levels between 2 and 4 pCi/L. No radon level is completely risk-free.
A single number still needs context. Consider the test duration, whether required conditions were maintained, device placement, and whether the result may need confirmation. The EPA’s current Home Buyer’s and Seller’s Guide to Radon explains testing and mitigation considerations for real-estate transactions.
What happens if the result is elevated?
An elevated result does not automatically mean the sale must end. Radon-reduction systems can lower levels in many homes. The appropriate next step depends on the result, transaction timeline, test validity, home design, and advice from qualified professionals.
Possible next steps include:
- Confirm that the test conditions and placement were appropriate.
- Discuss whether a follow-up or confirmatory test is recommended.
- Obtain an evaluation and proposal from a qualified radon-mitigation professional.
- Address the issue through the purchase contract with guidance from the real estate professionals or attorneys involved.
- Plan a post-mitigation test to verify system performance.
The person testing should not promise a particular legal outcome or tell the buyer what contract decision to make.
What does radon mitigation involve?
Many mitigation systems use a fan and vent piping to collect soil gas beneath the building and discharge it safely above the roofline. Sealing accessible openings may support the system but is not usually the sole reduction method. System design depends on the foundation, crawlspace, slab configuration, additions, and other building conditions.
Mitigation should be performed by a properly qualified professional following applicable requirements. After installation, testing is important because the goal is measured reduction – not simply the presence of equipment.
Should newly constructed homes be tested?
Yes. Radon-resistant construction features can reduce risk and make future mitigation easier, but they do not prove the finished home has a low radon level. EPA resources for real-estate professionals include guidance for newly built homes, and testing after construction provides property-specific information.
If the home has a passive radon system, ask whether it has been labeled, routed, and completed as designed. A qualified professional can explain whether further evaluation or activation is appropriate based on testing.
Radon testing is different from a home inspection
A standard home inspection is a visual examination. Radon cannot be detected by sight or smell, so it requires dedicated measurement equipment and a defined test period. Buyers should request the service early enough to satisfy both testing protocol and contract deadlines.
Similarly, indoor air quality testing may address other questions, but it does not substitute for a radon measurement unless radon is explicitly included.
Radon testing across Northern Alabama
McNeese Home Inspections provides radon testing for buyers and homeowners in Huntsville and surrounding North Alabama communities. We coordinate testing with the property schedule, explain the required conditions, and provide results that clients can review with the professionals guiding their transaction.
| CALL TO ACTION Need a radon test for a home purchase or your current property? Call McNeese Home Inspections at (256) 750-0877 or schedule radon testing. Have the address, occupancy status, inspection deadline, and access details ready. |
Frequently asked questions
Can I tell whether a house has radon by smell or symptoms?
No. Radon is invisible and odorless. Testing is required to measure its concentration, and occupants should not rely on physical symptoms to determine whether it is present.
Is 4 pCi/L a clear safe-or-dangerous dividing line?
No. EPA uses 4 pCi/L as its recommended action level and advises considering action between 2 and 4 pCi/L. Risk does not suddenly begin at one exact number.
Can opening windows lower the test result?
Ventilation can affect indoor radon concentration and invalidate a short-term test if required closed-building conditions are not followed. Maintain the conditions provided by the testing professional.
Does a mitigation system mean the home is unsafe to buy?
Not necessarily. A properly designed and functioning system may significantly reduce radon. Buyers should review installation details, maintenance needs, and recent test results, and arrange additional evaluation when appropriate.