Pearl River County, MS: EPA's radon zone, explained

EPA's own radon map rates Pearl River County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. That puts Pearl River County in the 23rd percentile nationally for radon potential — higher than 23% of the counties EPA has rated.

Where Pearl River County sits nationally

Pearl River County, Mississippi is home to about 59,030 people across 811.508 square miles. Averaged across its land area, Pearl River County runs about 73 people per square mile. By population, Pearl River County is the 306th largest of every county sharing its EPA zone — the 70th percentile by population within that zone. Geologically, Pearl River 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, Pearl River 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. Even at Zone 3, Pearl River County homes are not guaranteed a low reading — zone is a county-wide average, and EPA recommends testing every home regardless of zone.

If Pearl River County tests above the action level

For a Pearl River 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 Pearl River County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Pearl River 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 Pearl River County's figures come from

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.