Quick Answer

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.

Radon in Berks County, Pennsylvania

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 homeowners with 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

Fleetwood, PA →

Zone 1 · 6.2 pCi/L avg · 58.9% exceedance

High radon risk from Precambrian granulite and gneiss of the Reading Prong's core geological complex. Fleetwood sits directly on some of the oldest and most uranium-enriched rock in southeastern Pennsylvania — high-grade metamorphic basement that formed over a billion years ago. The granulite-gneiss complex here has higher uranium concentrations than the surrounding schist, making this section of the Reading Prong particularly productive for radon.

Hamburg, PA →

Zone 1 · 5.4 pCi/L avg · 54.3% exceedance

High radon risk at the transition zone between Blue Mountain's Silurian shale ridge and the Great Valley's Ordovician limestone floor. Hamburg sits at the base of Blue Mountain where runoff and erosion have deposited uranium-enriched colluvium from the ridge slopes onto the carbonate valley floor. This geological contact zone — where mountain-derived sediment meets karst limestone — concentrates radon production in a narrow band along the mountain front.

Kutztown, PA →

Zone 1 · 4.9 pCi/L avg · 56.1% exceedance

Extreme radon risk. Kutztown sits directly on the Reading Prong uranium-bearing granite and gneiss formation — the same bedrock responsible for the highest residential radon concentrations in eastern Pennsylvania. Berks County Zone 1 classification reflects this extreme geological risk.

Reading, PA →

Zone 1 · 5.1 pCi/L avg · 58.7% exceedance

Extreme radon risk. Reading sits directly on the Reading Prong formation — the densest uranium-bearing granitic bedrock in the eastern U.S., producing the highest statewide radon concentrations.

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 School Testing Mandate in Berks County

Pennsylvania Senate Bill 760 requires radon testing in every public school building constructed before 2014 that sits in an EPA Zone 1 county. Initial testing must be completed 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. For Berks County school districts — which fall in Zone 1 — the mandate applies directly and will surface results across most pre-2014 buildings during the 2026–2027 window. For full compliance details, see the Pennsylvania Radon Compliance 2026 guide.

Find a DEP-Certified Radon Contractor in Berks County

PA Radon Hub connects Berks County homeowners with independent DEP-certified radon testing and mitigation professionals. All contractors 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.

County: Berks County

PA Radon Hub is an independent informational resource. We do not perform radon testing or mitigation. We connect homeowners with DEP-certified professionals — verify any contractor's certification at dep.pa.gov/radon before hiring.

Frequently Asked Questions

What EPA radon zone is Berks County in?

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.

What geological formations drive radon risk in Berks County?

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.

Does SB 760 apply to public schools in Berks County?

Yes if Berks County schools fall in EPA Zone 1 and were built before 2014. Pennsylvania Senate Bill 760 requires public school buildings meeting those criteria to complete radon testing in the 2026–2027 academic year, with mitigation required within six months of any confirmed result at or above 4.0 pCi/L.