Can You Stay in Your Home During a Radon Test? What Homeowners Need to Know

Radon testing is one of the most reliable ways to detect elevated radon levels inside a home. Since radon is invisible, odorless, and radioactive, testing is the only way to know whether your indoor air may pose a long-term health risk.

But a radon test is only accurate when proper testing conditions are followed. Even small mistakes during the testing period can affect the results. That’s why understanding how radon testing works is just as important as performing the test itself.

In this guide, we’ll explain what homeowners should expect during a radon test, whether you can remain in the home during testing, and what factors can interfere with accurate radon readings.

What to Expect During a Radon Test

Radon tests are designed to measure the concentration of radon gas in the air inside your home. Results are reported in picocuries per liter (pCi/L), which indicates the amount of radon present indoors.

At Quality Environmental Testing, we perform professional 48-hour radon testing using calibrated continuous radon monitors that collect hourly readings throughout the testing period. This provides highly detailed and reliable data about the radon conditions inside the home.

During the test, the home must remain under “closed-house conditions” to help ensure accurate results. This means windows should remain closed, exterior doors should only be used for normal entry and exit, and ventilation patterns inside the home should not be significantly altered.

The process itself is simple and non-disruptive. Once the monitor is professionally placed, it quietly collects data while you continue your normal daily routine.

Can You Stay in the House During a Radon Test?

Yes — you can absolutely remain in your home during a radon test.

Simply living in the home, walking around, sleeping, cooking, or breathing indoors will not affect the results. Professional radon testing is designed to measure the air conditions under normal occupancy and everyday living conditions.

However, it’s important that homeowners avoid changing the home’s airflow or ventilation patterns during the testing period. Following the proper testing guidelines is what ensures accurate results.

What Can Affect a Radon Test?

While everyday living will not interfere with a radon test, certain actions and environmental conditions can impact the accuracy of the readings.

Opening Windows and Exterior Doors

Keeping windows or exterior doors open for extended periods can artificially lower radon levels by increasing ventilation and allowing radon gas to escape.

For accurate professional 48-hour testing, closed-house conditions should generally be maintained for at least 12 hours before the test begins and throughout the testing period.

Incorrect Test Placement

Where the radon monitor is placed matters.

Testing devices should not be located:

• Near windows or exterior doors

• Next to vents or fans

• In kitchens, bathrooms, or laundry rooms

• In high-humidity areas

• Directly against exterior walls

Improper placement can interfere with airflow around the device and produce unreliable results.

Moving or Tampering With the Device

Once a radon monitor is placed and activated, it should remain undisturbed for the entire testing period.

Even slight movement can alter airflow patterns around the monitor and impact the consistency of the readings.

Professional continuous radon monitors also include tamper detection features that help identify conditions that may compromise the test.

Running Fans or Ventilation Systems

Whole-house fans, attic fans, exhaust fans, and other ventilation systems can change indoor air pressure and affect how radon enters or exits the home.

These pressure changes may temporarily raise or lower radon levels during testing.

Severe Weather Conditions

Heavy storms, strong winds, rapid barometric pressure changes, and prolonged rainfall can temporarily influence indoor radon concentrations.

Rain-saturated soil can create what’s commonly called a “capping effect,” where moisture traps soil gases beneath the ground surface and increases pressure that pushes radon into the home through cracks and openings in the foundation.

This is one reason radon levels can fluctuate significantly during certain weather conditions.

Fireplaces and Combustion Appliances

Wood-burning fireplaces, stoves, and fuel-burning appliances can also alter indoor air pressure and airflow patterns, potentially affecting test results.

Any appliance or system that changes air movement inside the home can influence radon behavior during testing.

Why Professional Radon Testing Matters

DIY test kits can provide basic screening information, but professional radon testing offers several major advantages:

• Calibrated electronic monitoring equipment

• Hourly radon readings

• Tamper detection

• Professional monitor placement

• Faster reporting

• Reliable real estate transaction testing

At Quality Environmental Testing, we use professional continuous radon monitors to provide accurate, dependable results homeowners can trust.

As a testing-only company, QET provides unbiased radon measurement services without selling mitigation systems. This allows homeowners to receive objective testing results without sales pressure.

What Happens If Your Radon Levels Are High?

If your radon results are 4.0 pCi/L or higher, the EPA recommends taking corrective action to reduce radon levels inside the home.

Elevated radon levels are common throughout Illinois and the Chicagoland area, but the good news is that radon problems can usually be corrected effectively with a properly designed mitigation system.

The first step is accurate testing.

If you’re buying a home, selling a home, or simply want peace of mind about your indoor air quality, professional radon testing is one of the smartest investments you can make for your family’s health.

To schedule professional radon testing in Lockport and the surrounding south and southwest Chicagoland suburbs, contact Quality Environmental Testing today.