Radon Mitigation in Allentown, PA
Allentown anchors the Lehigh Valley metro (Allentown-Bethlehem-Easton) and Lehigh County is squarely on the Reading Prong — the uranium-rich Precambrian geological formation that drives some of the highest indoor radon readings in the eastern United States. EPA Zone 1 designation reflects this. The Lehigh Valley has historically led PA in average residential radon levels.
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Who provides radon mitigation in Allentown, PA?
Pennsylvania Radon Experts connects Allentown homeowners with NRPP-certified radon mitigation specialists serving Lehigh County. Allentown averages 10.4 pCi/L — above the EPA action level of 4.0 — so testing and mitigation are routed to a qualified local partner, typically within hours. Free quote within 24 hours. Call (717) 527-6206.
Why Do Allentown Homes Have Elevated Radon?
Allentown anchors the Lehigh Valley metro (Allentown-Bethlehem-Easton) and Lehigh County is squarely on the Reading Prong — the uranium-rich Precambrian geological formation that drives some of the highest indoor radon readings in the eastern United States. EPA Zone 1 designation reflects this. The Lehigh Valley has historically led PA in average residential radon levels.
Geology: The Reading Prong extends through Lehigh, Northampton, and Berks counties — a band of uranium-bearing Precambrian gneiss and granite that produced the original 'Watras incident' radon readings that led to the federal radon program. Lehigh Valley basement readings routinely exceed 20 pCi/L; some homes have tested above 100 pCi/L.
Permits: City of Allentown building permits may apply. PA DEP Bureau of Radiation Protection certification (Title 25 Pa. Code Chapter 240) is required for the contractor — the Reading Prong context makes credentialed mitigation critical.
Neighborhoods we serve in Allentown: West End, South Side, East Side, Center City Allentown, Trexlertown, Wescosville, Macungie.
All Allentown radon work is performed by NRPP-certified, PA DEP-certified partner contractors routed through Pennsylvania Radon Experts.
How Does Allentown Compare on Pennsylvania Radon Levels?
Lehigh County averages 10.4 pCi/L indoor radon — well above the EPA action level of 4 pCi/L. Here's how Allentown's radon profile compares to other Pennsylvania cities we serve.
| Metric | Allentown, PA | Pennsylvania State Average | US National Average |
|---|---|---|---|
| Average indoor radon | 10.4 pCi/L | 8.6 pCi/L | 1.3 pCi/L |
| EPA Radon Zone | Zone 1 | Zone 1 (majority) | Varies (Zones 1–3) |
| % homes elevated (>4 pCi/L) | 50% | ~40% (2 in 5) | ~6% |
| Multiple of EPA action level | 2.6x | 2.1x | 0.3x |
| EPA action level | 4.0 pCi/L | 4.0 pCi/L | 4.0 pCi/L |
Check Your Allentown Radon Test Result Against the EPA Action Level
Enter your radon test result (in pCi/L) to see whether your Allentown, PA home meets the EPA action level of 4.0 pCi/L — and exactly what to do next based on official EPA guidance. Allentown averages 10.4 pCi/L, with 50% 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 Allentown?
Radon Mitigation
Active radon mitigation system installation for Pennsylvania homes — sub-slab depressurization is the most common method, reducing…
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Radon Testing
Professional radon testing services for Pennsylvania homes — short-term (2-7 day) and long-term (90+ day) testing options. Require…
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Sub-Slab Depressurization Installation
Pennsylvania's most common radon mitigation method — sub-slab depressurization (ASD) creates negative pressure beneath the basemen…
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Crawl Space Radon Mitigation
Sub-membrane depressurization for Pennsylvania homes with crawl spaces — includes vapor barrier installation, sealing, and active …
Learn more →Do Allentown Real Estate Transactions Require Radon Testing?
Pennsylvania Real Estate Seller Disclosure Law (68 Pa. C.S. § 7301-7315) requires sellers to disclose any known radon test results to buyers. In practice, most Allentown real estate transactions now include a radon contingency in the purchase agreement — and given that 50% of Allentown 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 Allentown?
Yes. Allentown'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. Allentown winter radon readings are typically 30–50% higher than summer readings.
EPA recommends radon testing under closed-house conditions, which align naturally with Allentown winters. If your Allentown home tested low in summer, retest in winter for an accurate baseline before deciding on mitigation.
Recent Allentown Radon Mitigation Projects
Recent radon mitigation projects across Pennsylvania — every image is geo-tagged to a specific Pennsylvania city and entity-described for transparency and provenance. All work performed by NRPP-certified, PA DEP-certified partner contractors.
📍 Philadelphia, Pennsylvania 
📍 Pittsburgh, Pennsylvania 
📍 State College, Pennsylvania 
📍 West Philadelphia, Pennsylvania Allentown, PA Radon FAQs
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The Closest Pennsylvania Metros to Allentown We Also Serve
The nearest cities to Allentown in our statewide partner network. Click any for its county radon average, local profile, and a free quote.
Ready to Get a Free Allentown Radon Quote?
Same-day routing to a Lehigh County NRPP-certified partner. Written quote within 48 hours of site assessment.