What EPA's radon map says about Beaufort County

Beaufort County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Rank it against the rest of the country and Beaufort County lands in the 29th percentile for radon potential.

How Beaufort County compares

About 201,775 people live in Beaufort County, South Carolina, spread over 576.022 square miles. Averaged across its land area, Beaufort County runs about 350 people per square mile. Among counties sharing Beaufort County's EPA zone, it outranks 87% of them by population. Beaufort County falls in EPA Radon Region 4, one of 736 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Beaufort County's Zone 3 prediction is the low end of the scale. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Beaufort County testing above the action level often enough that skipping a test isn't the safe assumption.

If Beaufort County tests above the action level

Mitigation cost doesn't depend on Beaufort 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

Beaufort County's test kit answers today; a Airthings radon monitor keeps answering for Beaufort 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. Whatever zone Beaufort County carries, the zone explainer covers what it does and doesn't tell you about any one house.