Somerset County, PA: EPA's radon zone, explained

EPA's own radon map rates Somerset County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. That puts Somerset County in the 58th percentile nationally for radon potential — higher than 58% of the counties EPA has rated.

Where Somerset County sits nationally

Somerset County, Pennsylvania is home to about 72,134 people across 1,075.047 square miles. That works out to roughly 67 people per square mile. By population, Somerset County is the 254th largest of every county sharing its EPA zone — the 75th percentile by population within that zone. Geologically, Somerset 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 Somerset County

Somerset County's Zone 2 prediction clears the 1.3 pCi/L national indoor average without reaching EPA's own 4 pCi/L point for recommending a fix. A county-wide moderate average, like Somerset County's, can still hide a specific house well above or below it — testing is what actually answers the question.

If Somerset County tests above the action level

For a Somerset County homeowner, the order is simple: test first, since a kit costs a small fraction of what mitigation would. Only if the result clears 4 pCi/L does a system — typically $800–$2,500, about $1,200 for a common install — become worth pricing out.

Find Pennsylvania's state radon program

For Somerset County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Somerset County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.

Where Somerset County's figures come from

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.