What EPA's radon map says about Stewart County

EPA's own radon map rates Stewart County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Rank it against the rest of the country and Stewart County lands in the 43rd percentile for radon potential.

How Stewart County compares

About 14,365 people live in Stewart County, Tennessee, spread over 459.776 square miles. Averaged across its land area, Stewart County runs about 31 people per square mile. Among counties sharing Stewart County's EPA zone, it outranks 30% of them by population. Geologically, Stewart County is grouped into EPA Region 4 alongside 735 other counties that share its rock and soil setting.

What this actually means for a house in Stewart County

EPA's Zone 2 rating for Stewart County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Stewart County — testing is the only way to know an individual home's actual level.

Testing and mitigation in Stewart County

Mitigation cost doesn't depend on Stewart 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

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

The methodology guide shows exactly which EPA and Census sources feed Stewart County's numbers. Whatever zone Stewart County carries, the zone explainer covers what it does and doesn't tell you about any one house.