What EPA's radon map says about Sequatchie County

EPA places Sequatchie County in Zone 3 - Low Potential — a predicted county-wide average indoor radon level below 2 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Nationally, Sequatchie County ranks higher in radon potential than 12% of rated counties (the 12th percentile).

Sequatchie County by the numbers

About 17,620 people live in Sequatchie County, Tennessee, spread over 265.851 square miles. Population density there runs about 66 people per square mile. Among counties sharing Sequatchie County's EPA zone, it outranks 35% of them by population. Sequatchie County falls in EPA Radon Region 4, one of 736 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Sequatchie County's predicted average sits below the national indoor average of about 1.3 pCi/L, well under EPA's 4 pCi/L action level. Even at Zone 3, Sequatchie County homes are not guaranteed a low reading — zone is a county-wide average, and EPA recommends testing every home regardless of zone.

Testing and mitigation in Sequatchie County

Mitigation cost doesn't depend on Sequatchie 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

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

More on how this number was built

Sequatchie County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.