Kershaw County, SC Radon Zone Data

Kershaw County, SC: EPA's radon zone, explained

EPA's own radon map rates Kershaw 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 Kershaw County lands in the 25th percentile for radon potential.

Where Kershaw County sits nationally

Kershaw County, South Carolina is home to about 71,698 people across 726.612 square miles. That works out to roughly 99 people per square mile. By population, Kershaw County is the 264th largest of every county sharing its EPA zone — the 74th percentile by population within that zone. EPA's geology-based Region 4 groups Kershaw County with 735 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Kershaw County

Kershaw 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. A Zone 3 rating means Kershaw County's county-wide average is predicted low, but EPA is explicit that a meaningful share of homes in low-potential zones still test above the action level — a low zone is not a reason to skip testing.

Testing and mitigation in Kershaw County

For a Kershaw 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 South Carolina's state radon program

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

Where Kershaw County's figures come from

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