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

Jones County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. That puts Jones County in the 24th percentile nationally for radon potential — higher than 24% of the counties EPA has rated.

How Jones County compares

Jones County, Mississippi is home to about 65,837 people across 694.845 square miles. Averaged across its land area, Jones County runs about 95 people per square mile. By population, Jones County is the 284th largest of every county sharing its EPA zone — the 73rd percentile by population within that zone. EPA's geology-based Region 4 groups Jones County with 735 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Jones County's Zone 3 prediction is the low end of the scale. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Jones County testing above the action level often enough that skipping a test isn't the safe assumption.

If Jones County tests above the action level

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

Where Jones County's figures come from

Jones 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.