What EPA's radon map says about Randall County

EPA's own radon map rates Randall County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Nationally that's the 61st percentile for radon potential — Randall County outranks 61% of every county EPA has rated.

Randall County by the numbers

About 150,547 people live in Randall County, Texas, spread over 912.711 square miles. Averaged across its land area, Randall County runs about 165 people per square mile. Among counties sharing Randall County's EPA zone, it outranks 85% of them by population. EPA's geology-based Region 6 groups Randall County with 502 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Randall County's predicted average falls between EPA's 4 pCi/L action level and the national indoor average of about 1.3 pCi/L (outdoor air runs roughly 0.4 pCi/L). Nothing about a Zone 2 label lowers the case for testing in Randall County — EPA recommends it in every zone, moderate included.

If Randall County tests above the action level

Mitigation cost doesn't depend on Randall 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 Texas's state radon program

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

More on how this number was built

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.