Is Benton County, MO a radon risk area?

Benton 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. Benton County sits at the 46th percentile nationally for radon potential — above 46 of every 100 rated counties.

Where Benton County sits nationally

About 20,614 people live in Benton County, Missouri, spread over 704.033 square miles. That works out to roughly 29 people per square mile. Rank 616 by population within its EPA zone puts Benton County at the 40th percentile among zone peers. Geologically, Benton County is grouped into EPA Region 7 alongside 411 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

Call it a middle case: above the 1.3 pCi/L most US homes average, below the 4 pCi/L line EPA uses to recommend mitigation — that's Benton County's Zone 2 prediction. A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Benton County — testing is the only way to know an individual home's actual level.

If Benton County tests above the action level

Nothing about Benton 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

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

Benton County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.