Crittenden County, AR: EPA's radon zone, explained

EPA places Crittenden County in Zone 3 - Low Potential — a predicted county-wide average indoor radon level below 2 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Nationally, Crittenden County ranks higher in radon potential than 21% of rated counties (the 21st percentile).

Where Crittenden County sits nationally

Crittenden County, Arkansas is home to about 46,633 people across 611.812 square miles. Population density there runs about 76 people per square mile. By population, Crittenden County is the 362nd largest of every county sharing its EPA zone — the 65th percentile by population within that zone. EPA's geology-based Region 6 groups Crittenden County with 502 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Crittenden County's Zone 3 prediction undercuts the roughly 1.3 pCi/L most US homes average, nowhere near EPA's 4 pCi/L threshold for recommending mitigation. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Crittenden County testing above the action level often enough that skipping a test isn't the safe assumption.

If Crittenden County tests above the action level

For a Crittenden 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 Arkansas's state radon program

For Crittenden County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Crittenden 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 Crittenden County's figures come from

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