What EPA's radon map says about Nevada County

Nevada County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. That puts Nevada County in the 5th percentile nationally for radon potential — higher than 5% of the counties EPA has rated.

Nevada County by the numbers

About 8,004 people live in Nevada County, Arkansas, spread over 617.79 square miles. Population density there runs about 13 people per square mile. Among counties sharing Nevada County's EPA zone, it outranks 15% of them by population. EPA's geology-based Region 6 groups Nevada County with 502 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Nevada County

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Nevada County's Zone 3 prediction is the low end of the scale. Don't read Zone 3 as a pass for Nevada County — EPA's guidance to test every home makes no exception for counties predicted low.

Testing and mitigation in Nevada County

Mitigation cost doesn't depend on Nevada 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

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

The methodology guide shows exactly which EPA and Census sources feed Nevada County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.