Is Audrain County, MO a radon risk area?

Audrain County is mapped as Zone 2 - Moderate Potential by EPA — meaning the county-wide average indoor level is predicted between 2 and 4 pCi/L. Nationally that's the 48th percentile for radon potential — Audrain County outranks 48% of every county EPA has rated.

How Audrain County compares

About 24,304 people live in Audrain County, Missouri, spread over 692.25 square miles. Averaged across its land area, Audrain County runs about 35 people per square mile. Rank 561 by population within its EPA zone puts Audrain County at the 46th percentile among zone peers. Geologically, Audrain County is grouped into EPA Region 7 alongside 411 other counties that share its rock and soil setting.

Zone vs. an actual test

Audrain County's predicted average falls between EPA's 4 pCi/L action level and the national indoor average of about 1.3 pCi/L (outdoor air runs roughly 0.4 pCi/L). A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Audrain County — testing is the only way to know an individual home's actual level.

Next steps for a home in Audrain County

Nothing about Audrain 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 Missouri's state radon program

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

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