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

EPA places Jasper 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 Jasper County lands in the 61st percentile for radon potential.

Where Jasper County sits nationally

Jasper County, Missouri is home to about 126,479 people across 638.506 square miles. Population density there runs about 198 people per square mile. By population, Jasper County is the 163rd largest of every county sharing its EPA zone — the 84th percentile by population within that zone. EPA's geology-based Region 7 groups Jasper County with 411 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Jasper County's Zone 2 prediction lands in the gap between the two. A county-wide moderate average, like Jasper County's, can still hide a specific house well above or below it — testing is what actually answers the question.

If Jasper County tests above the action level

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

Where Jasper County's figures come from

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