What EPA's radon map says about Reynolds County

EPA's own radon map rates Reynolds County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. That puts Reynolds County in the 37th percentile nationally for radon potential — higher than 37% of the counties EPA has rated.

Where Reynolds County sits nationally

About 5,927 people live in Reynolds County, Missouri, spread over 808.477 square miles. Averaged across its land area, Reynolds County runs about 7 people per square mile. Among counties sharing Reynolds County's EPA zone, it outranks 11% of them by population. Reynolds County falls in EPA Radon Region 7, one of 412 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Reynolds 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 Reynolds County — EPA recommends it in every zone, moderate included.

Testing and mitigation in Reynolds County

Mitigation cost doesn't depend on Reynolds 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

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

More on how this number was built

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