What EPA's radon map says about Logan County

EPA places Logan 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. That puts Logan County in the 14th percentile nationally for radon potential — higher than 14% of the counties EPA has rated.

Where Logan County sits nationally

About 21,457 people live in Logan County, Arkansas, spread over 709.115 square miles. Averaged across its land area, Logan County runs about 30 people per square mile. Among counties sharing Logan County's EPA zone, it outranks 43% of them by population. EPA's geology-based Region 6 groups Logan County with 502 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Logan County's predicted average sits below the national indoor average of about 1.3 pCi/L, well under EPA's 4 pCi/L action level. Don't read Zone 3 as a pass for Logan County — EPA's guidance to test every home makes no exception for counties predicted low.

Next steps for a home in Logan County

Mitigation cost doesn't depend on Logan County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Arkansas's state radon program

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

Logan County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Logan County carries, the zone explainer covers what it does and doesn't tell you about any one house.