Radon levels in Butler County, Pennsylvania are high based on EPA Zone 1. 1 city has documented radon testing data through PA Radon Hub. The EPA action level of 4 pCi/L is exceeded in approximately 45% of tested homes in this region.
Radon in Butler County, Pennsylvania
Butler 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 Butler County.
Radon Risk in Butler County
The dominant subsurface formation across PA Radon Hub cities in Butler County is Appalachian Plateau / Glaciated Pittsburgh Plateau. 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. Butler County's Zone 1 classification means the county has high baseline radon potential, but every home should be tested individually.
Cities We Serve in Butler County
Radon and Home Sales in Butler County
Radon disclosure expectations and pre-sale testing practices vary across Pennsylvania, but Butler 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 Butler 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 Butler 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 Butler County
PA Radon Hub connects Butler 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.
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
Butler County is classified as Zone 1 — high radon potential — based on EPA radon zone mapping. 45% 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 Butler County is Appalachian Plateau / Glaciated Pittsburgh Plateau. 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.
Yes if Butler 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.