What EPA's radon map says about Chariton County

EPA's own radon map rates Chariton County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Nationally that's the 38th percentile for radon potential — Chariton County outranks 38% of every county EPA has rated.

How Chariton County compares

About 7,397 people live in Chariton County, Missouri, spread over 751.178 square miles. Averaged across its land area, Chariton County runs about 10 people per square mile. Among counties sharing Chariton County's EPA zone, it outranks 14% of them by population. Chariton County falls in EPA Radon Region 7, one of 412 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Chariton County

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Chariton County's Zone 2 prediction lands in the gap between the two. A county-wide moderate average, like Chariton County's, can still hide a specific house well above or below it — testing is what actually answers the question.

Testing and mitigation in Chariton County

Mitigation cost doesn't depend on Chariton 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 Missouri's state radon program

Chariton County's test kit answers today; a Airthings radon monitor keeps answering for Chariton 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. Whatever zone Chariton County carries, the zone explainer covers what it does and doesn't tell you about any one house.