Radon in Berks County, Pennsylvania
Radon levels in Berks County, Pennsylvania are high based on EPA Zone 1. 4 cities have documented radon testing data through PA Radon Hub. The EPA action level of 4 pCi/L is exceeded in approximately 57% of tested homes in this region.
Berks County is classified as Zone 1 on the EPA Map of Radon Zones. This page aggregates radon risk data for every PA Radon Hub city in the county, explains the underlying geology, and connects Pennsylvania property owners with independent, DEP-certified testing and mitigation professionals serving Berks County.
Radon Risk in Berks County
The dominant subsurface formation across PA Radon Hub cities in Berks County is Reading Prong (Granite/Gneiss). Radon is produced continuously in uranium-bearing bedrock, migrates through soil gas, and enters the built environment through foundation penetrations. Pennsylvania's combination of fractured bedrock, older housing stock, and pronounced stack effect during the heating season drives elevated indoor radon across most of the Commonwealth.
The EPA zone classification divides counties by predicted average indoor radon: Zone 1 predicts average indoor radon above 4.0 pCi/L, Zone 2 predicts 2.0–4.0 pCi/L, and Zone 3 predicts below 2.0 pCi/L. Zone classifications are population averages — individual home results can vary substantially. Berks County's Zone 1 classification means the county has high baseline radon potential, but every home should be tested individually.
Cities We Serve in Berks County
Reading Prong / Precambrian Granulite-Gneiss Complex
Blue Mountain / Silurian-Ordovician Shale-Limestone Transition
Reading Prong (Granite/Gneiss)
Reading Prong (Granite/Gneiss)
Radon and Home Sales in Berks County
Radon disclosure expectations and pre-sale testing practices vary across Pennsylvania, but Berks County buyers and lenders increasingly request results during the inspection contingency period. Sellers often mitigate ahead of listing to avoid renegotiation when post-inspection results return high.
For a county-by-county breakdown of disclosure norms, mortgage requirements, and buyer/seller obligations, see the Radon and Home Sales in Pennsylvania guide.
SB 760 Proposed School Testing Mandate in Berks County
Pennsylvania Senate Bill 760, if enacted as currently drafted, would require radon testing in every public school building constructed before 2014 that sits in an EPA Zone 1 county. Initial testing would be required to occur during the 2026–2027 academic year under ANSI-AARST MA-MFLB protocol, with mitigation required within six months of any confirmed result at or above 4.0 pCi/L. As of 2026 SB 760 remains in committee, so no testing mandate is currently in force. For Berks County school districts — which fall in Zone 1 — the proposed mandate would apply directly and, if enacted, would surface results across most pre-2014 buildings during the 2026–2027 window. For full compliance details, see the Pennsylvania Radon Compliance 2026 guide.
Request Radon Information for Berks County
Submit your request and we will connect you with a DEP-certified professional serving Berks County. All providers verified against the PA Department of Environmental Protection Bureau of Radiation Protection directory.
For detailed pricing by foundation type across Pennsylvania, see the Pennsylvania Radon Mitigation Cost Guide.
Verify DEP certification status before hiring — search the PA DEP certified contractor directory.
PA Radon Hub is an independent informational resource. We do not perform radon testing or mitigation. We connect Pennsylvania property owners with independent, DEP-certified professionals — verify any contractor's certification at dep.pa.gov/radon before hiring.
Measured Radon Levels in Berks County
- Basement
- 11.68pCi/L
- based on 7,339 tests
- First Floor
- 7.00pCi/L
- based on 978 tests
PA DEP RadonZip Tool, January 1990 – December 2025 · Last updated 2026-05-20
Frequently Asked Questions
Berks County is classified as Zone 1 — high radon potential — based on EPA radon zone mapping. 57% of tested homes across PA Radon Hub cities in this county exceed the 4.0 pCi/L action level.
The dominant subsurface formation referenced across PA Radon Hub cities in Berks County is Reading Prong (Granite/Gneiss). Radon is produced by the decay of radium-226 in uranium-bearing bedrock and migrates into buildings through soil gas pathways — cracks, utility penetrations, and sump pits in the foundation.
Potentially, if Berks County schools fall in EPA Zone 1 and were built before 2014. Pennsylvania Senate Bill 760, if enacted as currently drafted, would require public school buildings meeting those criteria to complete radon testing during the 2026–2027 academic year, with mitigation required within six months of any confirmed result at or above 4.0 pCi/L. As of 2026 SB 760 remains in committee, so no testing mandate is currently in force.
Adjacent Zone 1 Counties
Radon risk does not stop at county lines. The geological formations driving elevated radon in Berks County extend into neighboring counties. DEP-certified contractors in this region typically serve multiple counties.