What EPA's radon map says about Richmond County

Richmond County is mapped as Zone 2 - Moderate Potential by EPA — meaning the county-wide average indoor level is predicted between 2 and 4 pCi/L. That puts Richmond County in the 62nd percentile nationally for radon potential — higher than 62% of the counties EPA has rated.

Where Richmond County sits nationally

About 206,303 people live in Richmond County, Georgia, spread over 324.36 square miles. That works out to roughly 636 people per square mile. Among counties sharing Richmond County's EPA zone, it outranks 88% of them by population. Geologically, Richmond County is grouped into EPA Region 4 alongside 735 other counties that share its rock and soil setting.

Zone vs. an actual test

Call it a middle case: above the 1.3 pCi/L most US homes average, below the 4 pCi/L line EPA uses to recommend mitigation — that's Richmond County's Zone 2 prediction. Richmond County's Zone 2 rating sits in the middle nationally; EPA's guidance is unchanged by that — test every home regardless of its zone.

If Richmond County tests above the action level

Mitigation cost doesn't depend on Richmond 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

Richmond County's test kit answers today; a Airthings radon monitor keeps answering for Richmond 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

The methodology guide shows exactly which EPA and Census sources feed Richmond County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.