Is Orangeburg County, SC a radon risk area?

EPA's own radon map rates Orangeburg County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Rank it against the rest of the country and Orangeburg County lands in the 25th percentile for radon potential.

Orangeburg County by the numbers

About 83,129 people live in Orangeburg County, South Carolina, spread over 1,106.379 square miles. Population density there runs about 75 people per square mile. Rank 245 by population within its EPA zone puts Orangeburg County at the 76th percentile among zone peers. Orangeburg 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

Orangeburg County's Zone 3 prediction undercuts the roughly 1.3 pCi/L most US homes average, nowhere near EPA's 4 pCi/L threshold for recommending mitigation. Don't read Zone 3 as a pass for Orangeburg County — EPA's guidance to test every home makes no exception for counties predicted low.

If Orangeburg County tests above the action level

Nothing about Orangeburg 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 South Carolina's state radon program

Orangeburg County's test kit answers today; a Airthings radon monitor keeps answering for Orangeburg 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.