What EPA's radon map says about Calhoun County

EPA's own radon map rates Calhoun County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Nationally that's the 3rd percentile for radon potential — Calhoun County outranks 3% of every county EPA has rated.

Where Calhoun County sits nationally

About 5,441 people live in Calhoun County, Georgia, spread over 280.384 square miles. Population density there runs about 19 people per square mile. Among counties sharing Calhoun County's EPA zone, it outranks 10% of them by population. Geologically, Calhoun 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 Calhoun County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. Don't read Zone 3 as a pass for Calhoun County — EPA's guidance to test every home makes no exception for counties predicted low.

If Calhoun County tests above the action level

Mitigation cost doesn't depend on Calhoun County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Georgia's state radon program

Calhoun County's test kit answers today; a Airthings radon monitor keeps answering for Calhoun County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.

More on how this number was built

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.