What EPA's radon map says about Fulton County

EPA places Fulton County in Zone 1 - Highest Potential — a predicted county-wide average indoor radon level above 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Nationally, Fulton County ranks higher in radon potential than 100% of rated counties (the 100th percentile).

How Fulton County compares

About 1,090,354 people live in Fulton County, Georgia, spread over 526.859 square miles. Population density there runs about 2,070 people per square mile. Among counties sharing Fulton County's EPA zone, it outranks 100% of them by population. Geologically, Fulton 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

Where the national indoor average runs about 1.3 pCi/L, Fulton County's Zone 1 rating puts its predicted county average above EPA's 4 pCi/L action level itself. A Zone 1 rating means testing is worth doing sooner rather than later, but it is still county-wide average, not a reading for any single house — some homes in Fulton County will test well under the action level, and EPA's guidance is to test regardless of zone.

Next steps for a home in Fulton County

Mitigation cost doesn't depend on Fulton 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

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