Radon Mitigation in Hilliard, OH
Hilliard is a fast-growing west-side Columbus suburb in Franklin County, where indoor radon averages 4.8 pCi/L. The area's rapid full-basement subdivision growth over glaciated limestone makes radon testing important even for recently built homes. Hilliard homeowners should test after move-in and every two years thereafter.
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Why Do Hilliard Homes Have Elevated Radon?
Geology: Ohio's cold winters intensify the stack effect, drawing radon-laden soil gas up through foundation cracks, sumps, and slab penetrations. Indoor radon commonly tests higher in winter, so a cold-season short-term test or a long-term test gives the most reliable reading.
Permits: Ohio requires radon mitigation contractors to hold an Ohio Department of Health (ODH) radon license. Franklin County homeowners should verify the contractor's ODH license number and obtain post-mitigation testing to confirm levels fall below the 4 pCi/L action level.
Neighborhoods we serve in Hilliard: Old Hilliard, Heritage Lakes, Brown Township line, Hoffman Farms, Trails End.
All Hilliard radon work is performed by NRPP-certified, ODH-certified partner contractors routed through Ohio Radon Experts.
How Does Hilliard Compare on Ohio Radon Levels?
Franklin County averages 4.8 pCi/L indoor radon — well above the EPA action level of 4 pCi/L. Here's how Hilliard's radon profile compares to other Ohio cities we serve.
| Metric | Hilliard, OH | Ohio State Average | US National Average |
|---|---|---|---|
| Average indoor radon | 4.8 pCi/L | 4.7 pCi/L | 1.3 pCi/L |
| EPA Radon Zone | Zone 1 | Zone 1 (majority) | Varies (Zones 1–3) |
| % homes elevated (>4 pCi/L) | 38% | ~33% (1 in 3) | ~6% |
| Multiple of EPA action level | 1.2x | 2.1x | 0.3x |
| EPA action level | 4.0 pCi/L | 4.0 pCi/L | 4.0 pCi/L |
Check Your Hilliard Radon Test Result Against the EPA Action Level
Enter your radon test result (in pCi/L) to see whether your Hilliard, OH home meets the EPA action level of 4.0 pCi/L — and exactly what to do next based on official EPA guidance. Hilliard averages 4.8 pCi/L, with 38% of homes testing elevated.
Enter the picocuries-per-liter value from your charcoal canister or continuous radon monitor (CRM) report.
How the calculator maps test results to EPA guidance
| Radon level (pCi/L) | Risk tier | EPA-aligned recommendation |
|---|---|---|
| 0.0 – 1.9 | Below average — low | No action needed. Re-test every 2 years or after major renovation. |
| 2.0 – 3.9 | Elevated — EPA "consider mitigating" | Consider mitigation, especially with smokers, children, or lower-level bedrooms. Run a long-term (90+ day) test for confirmation. |
| 4.0 or higher | EPA Action Level — fix the home | Install an active radon mitigation system. EPA recommends fixing the home as soon as practical. |
Which Radon Services Are Available in Hilliard?
Radon Mitigation
Active radon mitigation system installation for Ohio homes — sub-slab depressurization is the most common method, reducing indoor …
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Radon Testing
Professional radon testing services for Ohio homes — short-term (2-7 day) and long-term (90+ day) testing options. Required for mo…
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Sub-Slab Depressurization Installation
Ohio's most common radon mitigation method — sub-slab depressurization (ASD) creates negative pressure beneath the basement slab, …
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Crawl Space Radon Mitigation
Sub-membrane depressurization for Ohio homes with crawl spaces — includes vapor barrier installation, sealing, and active depressu…
Learn more →Do Hilliard Real Estate Transactions Require Radon Testing?
Ohio Residential Property Disclosure Act (Ohio Rev. Code § 5302.30) requires sellers to disclose any known radon test results to buyers. In practice, most Hilliard real estate transactions now include a radon contingency in the purchase agreement — and given that 38% of Hilliard homes test elevated, buyers are increasingly insisting on pre-closing mitigation when results exceed 4 pCi/L.
Our partner contractor network handles closing-timeline mitigations within typical 7–14 day windows, including post-mitigation verification testing to satisfy lender and inspector requirements.
Are Winter Radon Levels Higher in Hilliard?
Yes. Hilliard's cold winters intensify radon entry through the stack effect — heated indoor air rising creates negative pressure in basements that pulls soil gas into the home at higher rates than warmer climates. Hilliard winter radon readings are typically 30–50% higher than summer readings.
EPA recommends radon testing under closed-house conditions, which align naturally with Hilliard winters. If your Hilliard home tested low in summer, retest in winter for an accurate baseline before deciding on mitigation.
Recent Hilliard Radon Mitigation Projects
Recent radon mitigation projects across Ohio — every image is geo-tagged to a specific Ohio city and entity-described for transparency and provenance. All work performed by NRPP-certified, ODH-certified partner contractors.
📍 Philadelphia, Ohio 
📍 Pittsburgh, Ohio 
📍 State College, Ohio 
📍 West Philadelphia, Ohio Hilliard, OH Radon FAQs
What are typical radon levels in Hilliard?
Why are Hilliard radon levels so high?
How do I find a certified radon mitigation contractor in Hilliard?
How long does it take to schedule radon mitigation in Hilliard?
What Other Ohio Cities Do We Serve Near Hilliard?
Columbus, OH
Franklin County · 4.8 pCi/L avg
Cleveland, OH
Cuyahoga County · 5.2 pCi/L avg
Cincinnati, OH
Hamilton County · 4.5 pCi/L avg
Toledo, OH
Lucas County · 4.6 pCi/L avg
Akron, OH
Summit County · 5.5 pCi/L avg
Dayton, OH
Montgomery County · 4.4 pCi/L avg
Youngstown, OH
Mahoning County · 5.8 pCi/L avg
Canton, OH
Stark County · 5 pCi/L avg
Ready to Get a Free Hilliard Radon Quote?
Same-day routing to a Franklin County NRPP-certified partner. Written quote within 48 hours of site assessment.