Is Cumberland County, PA a radon risk area?

EPA places Cumberland County in Zone 1 - Highest Potential — a predicted county-wide average indoor radon level above 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Nationally, Cumberland County ranks higher in radon potential than 97% of rated counties (the 97th percentile).

Where Cumberland County sits nationally

About 275,516 people live in Cumberland County, Pennsylvania, spread over 545.483 square miles. Averaged across its land area, Cumberland County runs about 505 people per square mile. Rank 82 by population within its EPA zone puts Cumberland County at the 92nd percentile among zone peers. Geologically, Cumberland County is grouped into EPA Region 3 alongside 244 other counties that share its rock and soil setting.

What this actually means for a house in Cumberland County

Cumberland County carries a Zone 1 label because its predicted average clears 4 pCi/L outright — three-plus times the 0.4 pCi/L typical outdoors and above the 1.3 pCi/L most homes see. Some Cumberland County homes will test comfortably under the action level despite the county's Zone 1 rating — the only way to know which kind of home you have is an actual test.

Testing and mitigation in Cumberland County

Nothing about Cumberland County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Pennsylvania's state radon program

Cumberland County's test kit answers today; a Airthings radon monitor keeps answering for Cumberland County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.

More on how this number was built

Cumberland County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.