What EPA's radon map says about Hardin County

EPA places Hardin County in Zone 2 - Moderate Potential — a predicted county-wide average indoor radon level between 2 and 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Rank it against the rest of the country and Hardin County lands in the 50th percentile for radon potential.

Hardin County by the numbers

About 27,617 people live in Hardin County, Tennessee, spread over 577.487 square miles. Population density there runs about 48 people per square mile. Among counties sharing Hardin County's EPA zone, it outranks 51% of them by population. Geologically, Hardin 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

Hardin County's Zone 2 prediction clears the 1.3 pCi/L national indoor average without reaching EPA's own 4 pCi/L point for recommending a fix. A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Hardin County — testing is the only way to know an individual home's actual level.

Testing and mitigation in Hardin County

Mitigation cost doesn't depend on Hardin 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 Tennessee's state radon program

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