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

Sharkey County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Sharkey County sits at the 2nd percentile nationally for radon potential — above 2 of every 100 rated counties.

Sharkey County by the numbers

Sharkey County, Mississippi is home to about 3,234 people across 431.72 square miles. Population density there runs about 7 people per square mile. By population, Sharkey County is the 974th largest of every county sharing its EPA zone — the 6th percentile by population within that zone. Geologically, Sharkey 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

A Zone 3 county like Sharkey County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. Even at Zone 3, Sharkey County homes are not guaranteed a low reading — zone is a county-wide average, and EPA recommends testing every home regardless of zone.

Testing and mitigation in Sharkey County

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

The methodology guide shows exactly which EPA and Census sources feed Sharkey County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.