What EPA's radon map says about Caldwell County

EPA's own radon map rates Caldwell County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Nationally that's the 39th percentile for radon potential — Caldwell County outranks 39% of every county EPA has rated.

Where Caldwell County sits nationally

About 9,000 people live in Caldwell County, Missouri, spread over 426.393 square miles. Averaged across its land area, Caldwell County runs about 21 people per square mile. Among counties sharing Caldwell County's EPA zone, it outranks 19% of them by population. Caldwell County falls in EPA Radon Region 7, one of 412 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

Caldwell 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. Nothing about a Zone 2 label lowers the case for testing in Caldwell County — EPA recommends it in every zone, moderate included.

Testing and mitigation in Caldwell County

Mitigation cost doesn't depend on Caldwell 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

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

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