Is Chester County, TN a radon risk area?

EPA places Chester 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. Nationally, Chester County ranks higher in radon potential than 45% of rated counties (the 45th percentile).

Where Chester County sits nationally

About 17,876 people live in Chester County, Tennessee, spread over 285.736 square miles. Population density there runs about 63 people per square mile. Rank 663 by population within its EPA zone puts Chester County at the 36th percentile among zone peers. EPA's geology-based Region 4 groups Chester County with 735 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Chester County's Zone 2 prediction lands in the gap between the two. Nothing about a Zone 2 label lowers the case for testing in Chester County — EPA recommends it in every zone, moderate included.

Testing and mitigation in Chester County

Nothing about Chester County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Tennessee's state radon program

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

Chester County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Chester County carries, the zone explainer covers what it does and doesn't tell you about any one house.