If a radon test came back above 4 pCi/L, the next search is almost always “certified radon mitigation contractors near me.” In Ohio, that search should lead you to someone licensed through the Ohio Department of Health — not just anyone with a drill and a shop-vac. Here is how to tell the difference before anyone sets foot in your basement.
How Do I Verify a Radon Mitigation Contractor Is Licensed in Ohio?
Ask for the contractor's Ohio radon license number and confirm it directly with the Ohio Department of Health, which administers radon tester and mitigation specialist licensing under Ohio Revised Code Chapter 3748. A legitimate operator will give you that number without hesitation, because it is public record.
Ohio treats radon testing and radon mitigation as two separate license categories — a tester license is not the same as a mitigation specialist license, and a contractor can hold one without the other. If someone offers to test your home and install a system, confirm both licenses are current. Licenses expire and must be renewed, so “licensed in the past” is not the same as licensed now.
What Certifications Should a Radon Mitigation Contractor Have?
Look for a current credential from the National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB), since Ohio's licensing process accepts proficiency through these two national bodies. Either credential, paired with an active Ohio state license, is the baseline for someone installing a sub-slab system in your home.
These programs require continuing education and periodic re-certification, not a one-time exam. A contractor whose NRPP or NRSB listing has lapsed may still be a capable installer, but they are not currently meeting the standard Ohio requires for licensure, which matters if you ever need to reference the work during a real estate transaction.
Does Ohio Require a Separate License for Radon Mitigation vs. Radon Testing?
Yes — Ohio issues distinct radon tester and radon mitigation specialist licenses, and a company advertising “certified radon testing” is not automatically authorized to design or install a mitigation system. This split exists because measurement and system design involve different skill sets and liability.
This is also why some outfits subcontract: a licensed tester identifies the problem, and a separately licensed mitigation specialist designs and installs the fix. That is normal and not a red flag by itself — it only becomes a problem if neither party can produce a license number when asked. For a deeper walkthrough of verifying the testing side specifically, see Certified Radon Testing Near Me in Ohio: How to Verify a Pro.
What Actually Happens During a Radon Mitigation Installation?
A typical sub-slab depressurization install involves sealing a suction point through the foundation, running PVC pipe from below the slab up through the house and out above the roofline, and installing an inline fan that pulls soil gas out before it enters living space. A u-tube manometer is mounted on the pipe so you can visually confirm the fan is creating suction at any time.
Most installs take a single day, though homes with crawlspaces, multiple foundation sections, or finished basements can take longer because the pipe routing has to be planned around existing rooms. The licensed operators in our network will walk you through where the pipe and fan will be visible before work starts, since exterior fan placement affects both performance and how the house looks from the street.
How Much Does Radon Mitigation Cost in Ohio?
Cost depends on foundation type, how many suction points the system needs, and whether the fan and pipe run through finished living space or an unfinished basement — there is no single statewide flat rate. A home with a simple unfinished basement and one suction point is generally the least complex and least expensive scenario; additions, finished basements, and slab-on-grade homes with multiple foundation sections typically cost more because they need additional suction points or longer pipe runs.
For a detailed cost breakdown by factor, see Cincinnati Radon Mitigation Cost: What Actually Drives the Price, which applies to the pricing logic used across the state even outside that metro.
Is Certified Radon Mitigation Available Near Kettering and the Dayton Area?
Yes — licensed radon mitigation specialists operate throughout the Dayton metro, including Kettering, Centerville, and Oakwood, where glacial till soils and basement foundation styles are common enough that mitigation demand is steady. Local radon potential varies by county and even by neighborhood soil composition, which is why a home-specific test always comes before quoting a system.
If you have not tested yet, the Ohio Department of Health and the EPA both note that radon levels can shift with the seasons as homes are sealed up differently for heating and cooling. Our guide on the best time to test for radon in Ohio covers why winter readings are often the most representative.
What Should I Ask Before Hiring a Radon Mitigation Contractor?
Ask for the Ohio license number, the NRPP or NRSB certification ID, a written system diagram, and a post-install retest plan — a legitimate contractor should answer all four without pushback. You should also ask how the fan and pipe routing will look from outside the home before work begins.
After installation, the EPA recommends a follow-up test to confirm the system brought levels below 4 pCi/L. Keep that retest result with your paperwork — in Ohio, radon test results and mitigation disclosures can matter later during a home sale under the state's property disclosure requirements.
This article is general educational information, not legal or engineering advice. Confirm current license status directly with the Ohio Department of Health and verify any contractor's NRPP or NRSB credential before signing a contract. Radon levels, codes, and local permitting requirements vary by municipality — check your local building department for specifics.