Radon Levels in Berks County: Reading Prong Risk in Reading, Kutztown, Hamburg, and Fleetwood

Why Berks County Has Elevated Radon Risk

Berks County is designated EPA Zone 1 — the highest radon potential classification — by the United States Environmental Protection Agency. The county's position on Reading Prong granite and phyllite — crystalline bedrock formed approximately 1.1 billion years ago during the Grenville orogeny — produces soil uranium concentrations that are among the highest in the northeastern United States. Uranium-238 decays to radium-226, which decays to radon-222, a colorless odorless gas that migrates upward through soil and enters structures through foundation gaps, cracks, and utility penetrations.

In Berks County, bedrock in many residential areas sits close to the surface, particularly in the Reading corridor and northward through Kutztown toward Hamburg. This reduces the natural filtration distance between uranium-bearing rock and residential foundations, resulting in higher average indoor radon concentrations than counties where bedrock is deeper.

Homeowners, school administrators, and real estate professionals in Berks County should treat radon testing as mandatory, not optional. Pennsylvania's statewide testing data consistently shows Berks County exceeding the EPA's 4.0 pCi/L action level in a significant percentage of tested homes.

Berks County Municipalities with Elevated Radon Risk

The following cities and boroughs in Berks County are covered by PA Radon Hub with city-level radon data, DEP-certified contractor listings, and local geological analysis:

PA Radon Hub currently covers four municipalities in Berks County: Reading, Kutztown, Hamburg, and Fleetwood. Each city page includes average radon levels, local geological data, cost estimates, and connections to DEP-certified contractors serving that municipality. Berks County contractor listings cover the full county service area.

Reading Prong Geology and the Berks County Risk Profile

The Reading Prong runs northeast to southwest through Berks County, passing directly beneath Reading and continuing through the county's central and northern residential corridors. Pennsylvania's DEP first documented the scale of the radon problem in this region following the 1984 Stanley Watras incident in neighboring Montgomery County — an event that triggered the first major federal radon survey and established the Reading Prong as the primary high-risk zone in the northeastern United States. Berks County's data collected since then confirms elevated radon across all housing vintages, not just older construction. New homes built on Reading Prong geology without radon-resistant features test above the EPA action level at comparable rates to older housing stock.

Under Pennsylvania radon regulations (PA Code § 240), all radon mitigation work must be performed by a DEP-certified contractor. The standard mitigation approach for Berks County foundations is active sub-slab depressurization (ASD), typically using a system such as the RadonAway RP145 fan unit. Installation creates a negative pressure zone beneath the foundation slab, preventing radon from migrating upward into living spaces.

SB 760 and Berks County School Districts

Pennsylvania Senate Bill 760, if enacted as drafted, would mandate radon testing in all public school buildings by the 2026–2027 academic year. As of 2026, the bill remains in committee. Berks County school districts would be subject to this requirement if SB 760 is enacted. Elevated radon in school buildings follows the same geological patterns as residential exposure — districts in Berks County should prioritize testing in older buildings with basement or slab-on-grade construction.

DEP-certified contractors serving Berks County school districts retained for mitigation would be required to follow the same PA Code § 240 protocols required for residential mitigation. PA Radon Hub connects school administrators with verified DEP-certified professionals for both testing and mitigation scopes.

Get Connected with a DEP-Certified Contractor in Berks County

PA Radon Hub is an independent informational resource. We are not a mitigation company, not a government agency, and not affiliated with PA DEP. We connect Pennsylvania property owners and school administrators with independent, DEP-certified radon professionals.

To find a DEP-certified radon contractor serving Berks County, visit the Berks County contractor page or browse city-level listings below:

• Reading — Berks County radon data and DEP contractor listings
• Kutztown — Berks County radon data and DEP contractor listings
• Hamburg — Berks County radon data and DEP contractor listings
• Fleetwood — Berks County radon data and DEP contractor listings
• Berks County — full county contractor directory

Verify any contractor's DEP certification independently at dep.pa.gov before hiring. Retain all documentation including the DEP certification number, installation records, and post-mitigation test results.

PA Radon Hub is an independent resource and not the direct service provider. All listed contractors are independent DEP-certified professionals.