Radon
Testing
Invisible. Odorless. Measurable.
Radon is a naturally occurring radioactive gas and the second leading cause of lung cancer in the United States. It can infiltrate your home through cracks in the foundation or other openings — and testing is the only way to know if it's present. Our certified professionals use precision electronic monitors to deliver accurate, lab-grade readings you can trust.
Test for Radon Gas in Your Property
Every radon test includes a comprehensive report with detailed readings, environmental data, and clear guidance on next steps — delivered directly to your inbox.
What Is Radon Gas?
Radon is a radioactive gas that is known to cause severe health problems — of which the most common is lung cancer. This gas can build up indoors, especially in the lower levels of your home, and put your family at risk. Because radon is invisible and odorless, professional testing is the only reliable way to determine exposure levels.
Multiple regions across North America — including Virginia, Maryland, and parts of Washington D.C. — have been noted to have elevated radon gas levels. Due to the health risks associated with prolonged exposure, the EPA recommends routinely testing your home for radon gas, particularly if you live in an area with known geological risk factors.
Industry-Recognized Radon Certifications
Our radon technicians are held to the highest standards — certified by the organizations that define testing quality and safety protocols nationwide.
Certified by the National Radon Safety Board, our radon technicians are held to all state standards, as well as ANSI/AARST, EPA Standards, and Testing Protocols to ensure testing quality and accuracy.
The American Association of Radon Scientists and Technologists is a nonprofit trade organization dedicated to the highest standards of excellence and the ethical performance of radon measurement.
NRPP is recognized as the leading certification program for radon professionals, requiring bi-annual documentation of competence, expertise, and performance to demonstrate skill, knowledge, and professionalism.
Why Test For Radon Gas?
Radon is an invisible threat you can't see, smell, or taste — but its health impact is real. Here's why every homeowner should test.
Causes Lung Cancer
Radon Gas is the second leading cause of lung cancer. The Surgeon General estimates radon is responsible for more than 20,000 lung cancer deaths per year — making it a critical health risk that demands awareness and proper testing.
Odorless and Colorless
Radon Gas is a radioactive gas that is odorless and colorless. There's no way for you to tell how high your radon levels are without proper testing — it's completely undetectable by human senses.
Prolonged Exposure
The noticeable symptoms generated from prolonged exposure may be mild and go unnoticed for an extended duration. Symptoms, such as wheezing, shortness of breath, and chest pains, can easily be attributed to other causes.
EPA's Designated High Risk Areas
The EPA has designated counties as Zone 1, 2, and 3 — with Zone 1 being the highest risk. The EPA provides a color-coded map of counties by zone number so you can see where your property falls on the risk scale.
How We Test for Radon Gas
At NextDay Inspect, we utilize the latest technology to provide you with hourly readings on radon levels in your property. We leave our equipment in your property for a minimum of 48 hours, which will give you a robust snapshot of what the radon levels are in your home.
Making Sure Your Radon Test is Effective
To ensure your radon test is accurate, you will need to prepare the home for appropriate testing conditions. Here's what to keep in mind.
Closed Conditions for 12 Hours
To provide the most accurate test for you, you will need to make sure the home is closed for at least 12 hours before, and during, the test. This means all windows and exterior doors are closed. Normal entry and exit usage is okay.
Test Must Be In the Lowest Occupied Level
The device is placed in the lowest occupied level in your home — this is where radon gas enters through, and will provide the most accurate readings. For most homes, this would be the basement. For properties with no basement, it would be placed in the lowest area regularly used, such as the living room.
Maintain Indoor Temperature Between 67–77°F
For maximum accuracy during testing, it is best to keep the indoor environment within usual indoor conditions. If the temperature inside gets overly hot or cold, it has the potential to affect the hourly reading of the sensor.
Continuous Air Sampling for a Minimum of 48 Hours
While you can buy a DIY radon test kit from a local store, these one-time kits are particularly sensitive to humidity and are based on one sample of the air. Our devices continuously sample and analyze the air for at least 48 hours, which secures a more accurate result. Results are available the same day sampling is completed.
Avoid Moving the Device
The testing device must remain in place for the full 48 hours of testing. Moving the device can affect the readings, potentially requiring retesting to ensure an accurate result. If you have any concerns regarding device placement or movement, please contact our office.
Avoid Using These Devices During Testing
Some devices may affect testing, particularly if used near the monitoring unit. Avoid using fireplaces and wood stoves if they are not your main source of heat. Keep fans near the device off — ceiling fans on different floors are okay — and make sure any central air conditioning is on the "Auto" setting to keep secondary air effects from altering the testing environment.