What EPA's radon map says about Dallas County

Dallas County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Nationally that's the 4th percentile for radon potential — Dallas County outranks 4% of every county EPA has rated.

Dallas County by the numbers

About 6,076 people live in Dallas County, Arkansas, spread over 667.323 square miles. Averaged across its land area, Dallas County runs about 9 people per square mile. Among counties sharing Dallas County's EPA zone, it outranks 11% of them by population. Geologically, Dallas County is grouped into EPA Region 6 alongside 502 other counties that share its rock and soil setting.

Zone vs. an actual test

Dallas 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 Dallas County testing above the action level often enough that skipping a test isn't the safe assumption.

Next steps for a home in Dallas County

Mitigation cost doesn't depend on Dallas 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

Dallas County's test kit answers today; a Airthings radon monitor keeps answering for Dallas County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

More on how this number was built

Dallas County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.