Is Laclede County, MO a radon risk area?

EPA places Laclede County in Zone 2 - Moderate Potential — a predicted county-wide average indoor radon level between 2 and 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Rank it against the rest of the country and Laclede County lands in the 52nd percentile for radon potential.

Where Laclede County sits nationally

About 36,738 people live in Laclede County, Missouri, spread over 764.684 square miles. That works out to roughly 48 people per square mile. Rank 427 by population within its EPA zone puts Laclede County at the 59th percentile among zone peers. Geologically, Laclede County is grouped into EPA Region 7 alongside 411 other counties that share its rock and soil setting.

Zone vs. an actual test

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 Laclede County's Zone 2 prediction. Middle-of-the-pack doesn't mean risk-free for any one Laclede County address — a moderate county average still leaves individual homes to test either side of it.

Next steps for a home in Laclede County

Nothing about Laclede 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

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

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. Whatever zone Laclede County carries, the zone explainer covers what it does and doesn't tell you about any one house.