Lawrence County, MS: EPA's radon zone, explained

EPA's own radon map rates Lawrence County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. That puts Lawrence County in the 8th percentile nationally for radon potential — higher than 8% of the counties EPA has rated.

Lawrence County by the numbers

Lawrence County, Mississippi is home to about 11,672 people across 430.602 square miles. Population density there runs about 27 people per square mile. By population, Lawrence County is the 779th largest of every county sharing its EPA zone — the 24th percentile by population within that zone. Geologically, Lawrence County is grouped into EPA Region 4 alongside 735 other counties that share its rock and soil setting.

Zone vs. an actual test

A Zone 3 county like Lawrence County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. A Zone 3 rating means Lawrence 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.

If Lawrence County tests above the action level

For a Lawrence 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 Mississippi's state radon program

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

Where Lawrence County's figures come from

Lawrence County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.