What EPA's radon map says about Phillips County

EPA's own radon map rates Phillips County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. That puts Phillips County in the 10th percentile nationally for radon potential — higher than 10% of the counties EPA has rated.

How Phillips County compares

About 14,661 people live in Phillips County, Arkansas, spread over 690.36 square miles. Averaged across its land area, Phillips County runs about 21 people per square mile. Among counties sharing Phillips County's EPA zone, it outranks 31% of them by population. Geologically, Phillips County is grouped into EPA Region 6 alongside 502 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Phillips County's Zone 3 prediction is the low end of the scale. A Zone 3 label describes Phillips County's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

Testing and mitigation in Phillips County

Mitigation cost doesn't depend on Phillips 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

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

Phillips County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.