What EPA's radon map says about Newberry County

EPA's own radon map rates Newberry County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Newberry County sits at the 20th percentile nationally for radon potential — above 20 of every 100 rated counties.

Newberry County by the numbers

About 39,203 people live in Newberry County, South Carolina, spread over 630.339 square miles. Averaged across its land area, Newberry County runs about 62 people per square mile. Among counties sharing Newberry County's EPA zone, it outranks 61% of them by population. Geologically, Newberry County is grouped into EPA Region 4 alongside 735 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

At Zone 3, Newberry County's predicted county average is under the national indoor average (~1.3 pCi/L) and well below EPA's 4 pCi/L action level — outdoor air nationally runs about 0.4 pCi/L for comparison. A Zone 3 label describes Newberry County's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

Testing and mitigation in Newberry County

Mitigation cost doesn't depend on Newberry County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find South Carolina's state radon program

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

More on how this number was built

Newberry County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Newberry County carries, the zone explainer covers what it does and doesn't tell you about any one house.