Radon Mitigation in Mansfield, OH
Mansfield is the largest city in north-central Ohio and the seat of Richland County, EPA Radon Zone 1. Mansfield sits at the transition between glacial till (north) and unglaciated Appalachian Plateau (southeast), with both regions contributing to elevated radon. Berea Sandstone and Mississippian-age shales underlie the area, with Devonian Ohio Shale exposed in eastern Richland County.
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Why Do Mansfield Homes Have Elevated Radon?
Geology: Mansfield's geology is the transition zone between Wisconsinan glacial till (deposited to the north and west) and the unglaciated Appalachian Plateau (east and south). Devonian Ohio Shale and Mississippian Berea Sandstone underlie the area — both are uranium-bearing and contribute to consistent elevated radon levels.
Permits: Mansfield Building and Zoning Department building permits may apply to slab penetration or exterior venting work. Ohio Department of Health (ODH) Radon Licensing per Ohio Admin. Code Chapter 3701-69 is required for any radon mitigation contractor performing work in Mansfield.
Neighborhoods we serve in Mansfield: Downtown, Woodland, Maple Lake, Lexington, Ontario, Shelby, Bellville, Lucas.
All Mansfield radon work is performed by NRPP-certified, ODH-certified partner contractors routed through Ohio Radon Experts.
How Does Mansfield Compare on Ohio Radon Levels?
Richland County averages 4.9 pCi/L indoor radon — well above the EPA action level of 4 pCi/L. Here's how Mansfield's radon profile compares to other Ohio cities we serve.
| Metric | Mansfield, OH | Ohio State Average | US National Average |
|---|---|---|---|
| Average indoor radon | 4.9 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) | 39% | ~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 Mansfield Radon Test Result Against the EPA Action Level
Enter your radon test result (in pCi/L) to see whether your Mansfield, OH home meets the EPA action level of 4.0 pCi/L — and exactly what to do next based on official EPA guidance. Mansfield averages 4.9 pCi/L, with 39% 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 Mansfield?
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 Mansfield 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 Mansfield real estate transactions now include a radon contingency in the purchase agreement — and given that 39% of Mansfield 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 Mansfield?
Yes. Mansfield'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. Mansfield winter radon readings are typically 30–50% higher than summer readings.
EPA recommends radon testing under closed-house conditions, which align naturally with Mansfield winters. If your Mansfield home tested low in summer, retest in winter for an accurate baseline before deciding on mitigation.
Recent Mansfield 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 Mansfield, OH Radon FAQs
What are typical radon levels in Mansfield?
Why are Mansfield radon levels so high?
How do I find a certified radon mitigation contractor in Mansfield?
How long does it take to schedule radon mitigation in Mansfield?
What Other Ohio Cities Do We Serve Near Mansfield?
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 Mansfield Radon Quote?
Same-day routing to a Richland County NRPP-certified partner. Written quote within 48 hours of site assessment.