Westerville homeowners often assume radon is someone else’s problem, tied to states with different geology or older housing stock. In reality, Franklin County falls squarely within the EPA’s Zone 1 classification, the highest radon potential category in the country, and radon testing has become one of the most important steps in protecting a home and the people living in it.
Why Westerville Homes Are at Elevated Risk
Radon is a colorless, odorless gas produced when uranium naturally present in soil and bedrock breaks down. Franklin County’s underlying geology tends to generate higher-than-average radon concentrations, and the gas moves upward through the ground until it finds a way inside a structure. Basements, crawl spaces, and homes built with foundation cracks or unsealed sump pits are especially vulnerable, since these are the most common entry points radon uses to accumulate indoors.
County-wide testing data collected over the past two decades shows Franklin County homes averaging well above the EPA’s action level of 4 picocuries per liter, and Westerville addresses have been part of that pattern for years. That does not mean every home in the area has a radon problem, but it does mean testing should never be skipped simply because a home looks well maintained or was recently renovated. Radon levels depend heavily on a home’s specific foundation, soil conditions directly beneath it, and how air circulates through the structure, so two nearly identical houses on the same street can produce very different results.
How Radon Testing Works
A radon test involves placing a specialized monitor in the lowest livable level of the home, typically a basement, for a set monitoring period. The device tracks radon concentration continuously and generates a report showing the average level recorded, along with details about any significant fluctuations during the test. For real estate transactions, Ohio requires radon testing to be performed by a state-licensed professional, since results are frequently used in negotiations between buyers and sellers.
Understanding What Your Results Mean
Results below 2 picocuries per liter are considered lower risk, although the EPA is clear that no radon exposure level is entirely without risk. Homes testing between 2 and 4 picocuries per liter fall into a range where mitigation is worth considering, particularly for households that spend significant time in basement living spaces. Any result at or above 4 picocuries per liter meets the EPA’s action threshold, and the agency recommends installing a mitigation system to bring levels down.
Mitigation itself is a well-established process. A sub-slab depressurization system draws radon gas from beneath the foundation and vents it above the roofline before it can accumulate indoors. Most systems reduce radon levels dramatically, often bringing a home that tested well above the action level down to a small fraction of that reading within a matter of weeks.
Why This Matters During a Home Purchase
Buyers moving into Westerville, whether relocating from another state or simply purchasing their first home locally, often have no idea the area carries this level of radon potential until a home inspector raises the issue. Testing before closing gives buyers real information to work with, whether that means negotiating for the seller to cover mitigation costs or simply budgeting for a system after move-in. Sellers benefit as well, since knowing a home’s radon status ahead of a buyer’s inspection allows them to address the issue proactively rather than scrambling once a deal is already underway.
Ongoing Testing Even After You Move In
Radon levels can shift over time as soil conditions change, as a home settles, or after renovations that affect the foundation or ventilation. Homeowners who tested clear when they bought their home still benefit from retesting every couple of years, and the EPA specifically recommends retesting within thirty days of installing a mitigation system and periodically afterward to confirm it continues working as intended.
While You Wait for Your Results
Radon monitoring periods leave a little time to explore the area. Hoover Reservoir Parkland on the edge of Westerville offers miles of trails, fishing access, and scenic water views, making it an easy stop for residents and visiting family alike. You can find current details through Columbus Recreation and Parks’ official Hoover Reservoir page.
Frequently Asked Questions
How long does a radon test take? Most short-term radon tests run for a minimum monitoring period set by state guidelines, typically a few days depending on the device used.
Can I test for radon myself instead of hiring a professional? Consumer test kits exist, but Ohio requires testing performed by a state-licensed radon professional for results used in real estate transactions.
Does a high radon reading mean something is wrong with the house itself? No. Elevated radon is primarily a result of local soil and geology, not poor construction, and it can be effectively addressed with a mitigation system regardless of the home’s age or condition.
How often should I retest my home? The EPA recommends retesting every two years, and sooner if you complete a major renovation, install a new HVAC system, or notice any changes to your foundation.
Schedule Your Radon Test Today
By-Lions Home Inspections has provided radon testing throughout Westerville and Central Ohio for years, backed by owner Josh Branham’s thorough, detail-oriented approach to every inspection. Schedule your inspection today and get clear answers about your home’s radon levels.