Professional Radon Testing Services
IAC2 Certified Radon Testing in St. Charles, Warren, Franklin & Lincoln County, MO
Protect your family from the invisible threat of radon gas with certified testing from Tech Inspect Home Services LLC — fast, accurate readings to ensure your home's air is safe and healthy.
IAC2 Certified
EPA-Protocol Testing
Results in 24 Hours
St. Charles County & Beyond
Why Radon Testing Is Critical
Health Risks
Radon exposure is a serious health concern. When you breathe air containing radon, you increase your risk of developing lung cancer. The risk is especially high for smokers, but non-smokers are also at risk.
It's Everywhere
Radon can be found in all 50 states and affects homes of all types and ages. Your neighbor's low radon level doesn't mean your home is safe — every home should be tested.
It's Fixable
If elevated radon levels are found, proven radon reduction systems can lower radon levels by up to 99%. Most homes can be fixed for about the same cost as other common home repairs.
What is Radon?
Radon is a colorless, odorless, and tasteless radioactive gas that forms naturally from the decay of uranium found in soil, rock, and water. Because you cannot see, smell, or taste radon, the only way to know if it's present in your home is through professional testing.
Radon typically moves up through the ground and enters your home through cracks and other openings in the foundation. Once inside, your home traps radon where it can build up to dangerous levels. Any home can have a radon problem — new homes, old homes, drafty homes, insulated homes, homes with basements, and homes without basements.
#2
Radon is the second leading cause of lung cancer in the United States
— According to the EPA and U.S. Surgeon General
EPA Action Level: 4.0 pCi/L
The EPA recommends fixing your home if radon levels are 4 pCi/L (picocuries per liter) or higher. Because there is no known safe level of radon exposure, the EPA also recommends considering fixing your home for levels between 2 and 4 pCi/L.
For reference, the average indoor radon level in American homes is about 1.3 pCi/L, while outdoor air averages 0.4 pCi/L
Understanding Radon Levels
<2 pCi/L
2–4 pCi/L
>4 pCi/L
Below EPA threshold — continue to monitor periodically
EPA recommends considering mitigation — elevated risk
EPA recommends fixing your home — action required
Our Professional Testing Process
As an IAC2 certified radon professional, we follow EPA-recommended protocols and industry standards to ensure accurate, reliable testing results. Here's what you can expect:
01
We'll discuss your home's characteristics, determine the best radon testing location (typically the lowest lived-in level), and schedule your test. Testing should be conducted in regularly used rooms such as living rooms, dens, playrooms, or bedrooms — not in kitchens, bathrooms, laundry rooms, or hallways.
Pre-Test Consultation
02
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For accurate results, we require closed-building conditions beginning at least 12 hours before the test starts — keeping all windows and exterior doors closed as much as possible, except for normal entry and exit. Heating and air conditioning systems that recirculate air may continue to operate normally.
Closed-Building Conditions
03
A certified radon testing device is placed in the appropriate location. For real estate transactions, we typically use short-term tests lasting 48 hours. The device is placed at least 20 inches above the floor and away from drafts, high humidity areas, and exterior walls.
Device Placement
04
During the testing period (typically 48–72 hours for short-term tests), you can continue your normal daily activities. It's important not to disturb the testing device and to maintain closed-building conditions. You do not need to vacate your home during testing.
Testing Period
05
After the testing period, we will retrieve the device and create a report that will be available to you within 24 hours of device retrieval.
Device Retrieval & Analysis
06
You'll receive a detailed report with your radon test results and clear recommendations. If levels are elevated, we'll explain your options and can provide referrals to qualified radon mitigation professionals who can design and install a reduction system.
Results & Recommendations
Important Testing Guidelines
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Do not conduct short-term testing during severe storms or periods of unusually high winds
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Small exhaust fans operating only for short periods may run during the test
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Doors should only be opened long enough to enter and exit the home — this includes any attached garage doors
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Windows must remain closed, even if the weather is nice
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Do not operate fans or machines that bring in air from outside — whole house fans, window A/C units
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Test devices must not be moved or tampered with during testing
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For the most accurate long-term assessment, consider a long-term test (90+ days) after initial screening
Radon Testing for Real Estate Transactions
If you're buying or selling a home in St. Charles County or surrounding Missouri communities, radon testing is a critical part of the due diligence process.
For Home Buyers
The EPA recommends testing the home before finalizing your purchase. If elevated radon levels are found, you can negotiate with the seller to have a radon reduction system installed, or account for the cost in your purchase agreement. Testing gives you peace of mind and protects your family's health.
For Home Sellers
Testing your home before listing it can prevent delays during the sale process. If mitigation is needed, having it done in advance demonstrates your home's safety and can be a strong selling point. Keep all test results and mitigation system documentation for potential buyers.
Why Choose IAC2 Certified Testing?
The International Association of Certified Indoor Air Consultants (IAC2) is a leading organization that certifies radon measurement and mitigation professionals. IAC2 certification means:
Comprehensive training completed on radon measurement protocols, device operation, quality assurance procedures, and industry standards.
Expert Training
We follow the latest EPA protocols and ANSI/AARST standards for radon measurement in homes, ensuring accurate and reliable results.
Current Standards
Strict quality control measures, calibrated equipment, and documented procedures are maintained for every test.
Quality Assurance
Frequently asked questions
How long does radon testing take?
How much does radon testing cost?
What happens if my home has high radon levels?
Can I test my home myself?
When is the best time to test for radon?
Should I retest for Radon?
Proudly Serving East-Central Missouri
Tech Inspect Home Services LLC provides professional radon testing throughout St. Charles, Franklin, Warren, and Lincoln counties — and surrounding communities.