7 Common Myths and Misconceptions About Radon

While many people understand that radon can pose a serious health risk, the confusion around this gas hasn’t disappeared. Misconceptions persist about where radon is found, what properties need testing, and how mitigation works. We sort through seven common myths to separate outdated assumptions from useful information. With the facts in place, homeowners and managers can make more informed decisions about protecting their properties.

1. Radon Only Affects High-Risk Areas

Radon is a naturally occurring radioactive gas released from rocks and soil, so it isn’t limited to one state, climate, or type of community. Some areas have a higher potential for elevated radon, but a regional designation can’t tell you what the level is inside a particular property. Only testing can provide that property-specific information.

Assuming radon only occurs in known hot spots can create a false sense of security. Conditions below one property may differ from those next door, which means indoor concentrations can vary even within the same neighborhood. Rather than relying on a map or someone else’s test results, it’s more useful to have your own property evaluated.

Why Radon Risk Varies Locally

Radon can move from the soil into a structure through openings where the building meets the ground. Foundation design and condition can influence how easily soil gas enters, while indoor pressure can affect how it moves once a pathway is available. Because those conditions differ from one property to another, nearby buildings can produce different test results.

2. Radon Is Only a Basement Problem

Another common myth about radon is that it’s only a concern for properties with basements. This misconception may lead people to dismiss radon concerns in slab-on-grade structures or properties with crawl spaces. In reality, radon can enter buildings through several types of openings, as long as soil gas has a pathway indoors. Once radon enters, normal air movement can carry it beyond the property’s lowest level.

Common entry points and pathways may include:

• cracks in concrete floors or foundations
• gaps around pipes and utility penetrations
• floor-to-wall joints
• sump openings
• crawl spaces
• other openings connected to the soil

3. New Buildings Don’t Have Radon

A newer property can still have elevated radon because the gas comes from the ground, not aging building materials. Modern construction alone doesn’t prevent soil gas from entering a building. Even a tightly built, well-maintained property can have elevated radon without any visible signs.

Some newer properties include radon-resistant features, but those measures don’t guarantee low indoor radon levels. Site conditions, foundation design, and other construction details can influence how much radon enters occupied spaces.

4. Short-Term Exposure Is Safe

Radon is primarily associated with health risks that develop from prolonged exposure, so it’s easy to assume shorter periods don’t carry risk. However, no level of radon exposure is completely safe, and risk increases with both concentration and exposure length. Radon is also a recognized cause of lung cancer, including among people who have never smoked.

That doesn’t mean a brief exposure carries the same risk as spending years in a property with elevated radon. The practical concern is identifying elevated concentrations, then installing a mitigation system to reduce ongoing exposure.

5. Radon Testing Is Unnecessary

Because radon has no color, smell, or taste, you can’t tell whether it’s present based on how a property looks or feels. A clean, well-maintained space may still have elevated concentrations. Testing is the only reliable way to know what the radon level is inside a home or workplace.

Testing or retesting may make sense when:

• Radon levels have never been measured.
• Previous results are over two years old.
• A property is being bought or sold.
• Major renovations have been completed.
• Previously unused lower-level areas will become occupied.
• Radon reduction work has been completed.

6. Radon Levels Never Change

A radon test captures conditions during a specific measurement period; it doesn’t mean the concentration will remain the same forever. Indoor radon can rise and fall as conditions inside and outside a property change. For that reason, measurements taken at different times may produce different results.

This variability is also why test duration and placement matter. Short-term tests typically measure radon over several days to a few months, giving property owners a faster snapshot of current conditions. Long-term tests remain in place for more than 90 days and provide an average that accounts for changes in radon levels over time. Because they capture a longer measurement period, long-term tests can better reflect a property’s typical radon exposure. If conditions in the property change significantly after testing, retesting can provide more current information.

What Can Affect Radon Levels

Weather and seasonal conditions can influence radon concentrations, as can changes in indoor airflow and pressure. Renovations may also alter how air moves through a property or how certain rooms are used. These fluctuations don’t make an earlier test irrelevant; they simply mean the result reflects the conditions during that measurement period. Retesting after substantial changes can provide a more current picture of indoor radon levels.

7. Every Mitigation System Is the Same

Radon mitigation systems may use similar principles, but they aren’t installed the same way in every property. The foundation type, layout, available suction points, and routing options can all influence how the system is designed.

Foundation Type Shapes the Design

The foundation is a main factor in how radon is collected and redirected. A system may draw soil gas from beneath a concrete slab, through a sump pit or drain tile, or from beneath a sealed crawl space membrane. Each method requires different installation details and may involve different suction points or piping routes.

Commercial Properties Add More Variables

Commercial properties can add design considerations because they may have larger footprints or more complex layouts. A larger slab may require multiple suction points to create enough negative pressure beneath the entire structure. Complex floor plans can also require longer piping runs or separate system zones to reach different sections of the property. Workplace radon mitigation may also need to account for where equipment can be placed without interfering with daily operations.

Radon is easier to deal with when you have reliable information about the conditions inside your property. Because radon levels can change over time, an older test may not always reflect what’s happening now. If your property has elevated radon levels, contact Affordable Radon Southwest to install a mitigation system designed for your space.