Radon Testing
Radon is one of those environmental risks that doesn’t announce itself. You can’t smell it, taste it, or see it. The only way to know whether the house you live in or the property you’re about to buy contains elevated indoor concentrations is to measure. In East Tennessee, that measurement matters more than in most parts of the country. Much of the region sits over uranium-bearing geology that produces radon at above-average rates, and the EPA has designated several counties in our service area as Zone 1, the agency’s highest-risk category. Radon testing turns an invisible risk into a documented number you can act on.
TEK Inspections provides radon testing throughout Knoxville, Oak Ridge, Oneida, Crossville, LaFollette, Maryville, and Jefferson City. Our team uses continuous radon monitors that produce hour-by-hour measurements over the testing period, follows established testing protocols to keep the results defensible in real estate transactions, and delivers reports that both buyers and homeowners can put to work. Whether the test is being ordered as part of a home purchase, following a mitigation system installation, or simply because the current owner wants to know what indoor levels look like, we handle the process with the care the health implications deserve.
About Radon Testing
Radon is a naturally occurring radioactive gas produced by uranium decay in soil and rock. It rises through the ground and enters buildings through foundation cracks, expansion joints, sump pits, floor drains, crawlspace connections, and any other pathway between the soil below and the interior air above. Once indoors, radon accumulates in enclosed spaces, particularly lower levels of homes, where it can reach concentrations that pose a documented health risk with long-term exposure.
Radon testing measures radon concentration in indoor air over a specified period. Our team uses continuous radon monitors that sample air throughout the testing period, record measurements at set intervals, and produce a report showing both the average concentration and the pattern of levels over time. This approach is more informative than passive charcoal canisters or single-point sampling because it captures how radon levels behave throughout the day, which matters for interpreting the result.
The standard testing protocol requires closed-house conditions during the measurement period. Keep windows and exterior doors closed except for normal entry and exit. HVAC systems operate normally, but technicians avoid whole-house fans, window air conditioners, and other equipment that could disturb the indoor air pressure balance. The monitor is placed in the lowest livable level of the home, positioned away from exterior walls, windows, drafts, and moisture sources. Tests typically run 48 to 96 hours, though longer durations are often preferable when possible.
Once the test period ends, the monitor’s data is retrieved and analyzed. Results are reported in picocuries per liter (pCi/L). The EPA recommends action when indoor concentrations reach or exceed 4.0 pCi/L, and the World Health Organization uses a lower threshold. Our reports include the average measured concentration, the range of hourly measurements, the pattern of levels over time, and information about what the results mean in practical terms.
If the result comes back elevated, we can advise on next steps, including recommendations for post-mitigation testing after a system is installed. Radon mitigation systems, typically installed by a certified mitigation contractor, use sub-slab depressurization or similar techniques to draw soil gas away from the home before it can enter. These systems are typically effective and reasonably priced, and post-mitigation testing confirms that concentrations have dropped to safe levels.
Why Radon Testing Matters in East Tennessee
The Appalachian geology across our service area produces above-average radon concentrations for a reason. The Ridge and Valley province, karst limestone formations, and uranium-bearing rock throughout parts of East Tennessee all contribute soil gas that enters homes through the pathways described above. Knox, Anderson, Roane, Blount, Loudon, Jefferson, and several surrounding counties include areas where the EPA has predicted average indoor radon concentrations exceeding 4.0 pCi/L. That means average homes in these areas, not just homes with particular construction defects, can be expected to test above the action level.
Homes with basements accumulate radon more efficiently than homes without them because the basement floor and walls sit directly against the soil where radon originates. Basement-finished living areas are particularly worth testing because occupants spend meaningful time there. Homes with crawlspaces are also affected, especially those with earth floors or partial vapor management, because radon can migrate from the crawlspace into upper living areas. Slab-on-grade homes are not immune. Cracks in slabs, plumbing and electrical penetrations, and expansion joints all provide entry paths.
Real estate transactions are where radon testing most often gets ordered, and the reasons are worth understanding. Buyers benefit from the documented information because it factors into their long-term health calculation and their decision about whether mitigation is needed after closing. Sellers who order pre-listing radon tests can address elevated levels proactively rather than negotiating over them mid-transaction. Lenders and insurance carriers occasionally have their own interests in the results. For homeowners simply wanting to know, radon testing provides peace of mind or, when levels are elevated, the information needed to remediate before long-term exposure continues.
There’s also a health consideration that deserves a plain statement. Radon is the second leading cause of lung cancer in the United States after smoking, and it is the leading cause among non-smokers. The risk is proportional to concentration and exposure duration, and it accumulates over years. Testing takes 48 to 96 hours. When needed, mitigation is typically a one-time expense that eliminates ongoing exposure. Both are proportionate responses to a documented health risk.
Why Choose TEK Inspections for Your Radon Testing?
Our team is trained and certified to perform radon measurements in accordance with established national standards. We use professional-grade continuous radon monitors, follow proper deployment and retrieval protocols, and maintain closed-house conditions and monitor placement to produce defensible results. As a multi-inspector firm, we can accommodate the scheduling needs of real estate transactions, complete tests within the timelines transactions typically require, and coordinate radon testing with our residential inspections when clients want both services in the same visit.
Our home inspectors treat radon testing as more than a data-collection exercise. We explain what the results mean, how they compare to relevant thresholds, and what the next steps look like when levels come back elevated. Follow-up questions after test delivery are welcome, and we’re happy to talk through implications with buyers, agents, and homeowners as needed. Past client reviews describe the working relationship in more concrete terms than we can here.
Schedule Your Radon Testing in Knoxville, Maryville, Oak Ridge, and Beyond Today
TEK Inspections offers radon testing alongside residential inspections, mold testing, water quality testing, well system inspections, and HUD foundation certifications. Bundling radon testing with a residential inspection is common during real estate transactions and is often the most efficient way to get a complete picture of the property. For rural homes served by private wells, combining radon testing with water quality testing addresses both airborne and waterborne exposure pathways in a single visit.
To book radon testing, contact us or schedule online. We serve Knoxville, Oak Ridge, Oneida, Crossville, LaFollette, Maryville, and Jefferson City. Whether you’re in the middle of a real estate transaction, planning a mitigation system installation, or want to know your indoor radon levels, our team is ready to place a monitor, run the test, and deliver the documented results your situation calls for.