Is Carbon County, PA a radon risk area?

EPA's own radon map rates Carbon County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Rank it against the rest of the country and Carbon County lands in the 92nd percentile for radon potential.

Where Carbon County sits nationally

About 65,743 people live in Carbon County, Pennsylvania, spread over 381.356 square miles. Population density there runs about 172 people per square mile. Rank 257 by population within its EPA zone puts Carbon County at the 76th percentile among zone peers. EPA's geology-based Region 3 groups Carbon County with 244 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Fixing a home becomes an EPA recommendation past 4 pCi/L, and that is precisely the side of the line Carbon County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. That doesn't mean every Carbon County house tests high — a zone is a county-wide prediction, never a single-home reading — but it's a reason to test sooner rather than let it wait.

If Carbon County tests above the action level

Nothing about Carbon 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

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

More on how this number was built

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.