Christian County, MO: EPA's radon zone, explained

EPA places Christian 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. Nationally that's the 59th percentile for radon potential — Christian County outranks 59% of every county EPA has rated.

How Christian County compares

Christian County, Missouri is home to about 96,045 people across 562.603 square miles. Averaged across its land area, Christian County runs about 171 people per square mile. By population, Christian County is the 210th largest of every county sharing its EPA zone — the 80th percentile by population within that zone. Geologically, Christian County is grouped into EPA Region 7 alongside 411 other counties that share its rock and soil setting.

What this actually means for a house in Christian County

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Christian County's Zone 2 prediction lands in the gap between the two. Christian County's Zone 2 rating sits in the middle nationally; EPA's guidance is unchanged by that — test every home regardless of its zone.

If Christian County tests above the action level

For a Christian County homeowner, the order is simple: test first, since a kit costs a small fraction of what mitigation would. Only if the result clears 4 pCi/L does a system — typically $800–$2,500, about $1,200 for a common install — become worth pricing out.

Find Missouri's state radon program

For Christian County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Christian County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.

Where Christian County's figures come from

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.