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

EPA places Jasper County in Zone 3 - Low Potential — a predicted county-wide average indoor radon level below 2 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Jasper County sits at the 11th percentile nationally for radon potential — above 11 of every 100 rated counties.

How Jasper County compares

Jasper County, Mississippi is home to about 15,799 people across 676.311 square miles. Averaged across its land area, Jasper County runs about 23 people per square mile. By population, Jasper County is the 698th largest of every county sharing its EPA zone — the 32nd percentile by population within that zone. Geologically, Jasper 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

Jasper County's predicted average sits below the national indoor average of about 1.3 pCi/L, well under EPA's 4 pCi/L action level. A Zone 3 label describes Jasper County's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

Next steps for a home in Jasper County

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

Jasper County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.