What EPA's radon map says about Nolan County

EPA places Nolan 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. Nolan County sits at the 10th percentile nationally for radon potential — above 10 of every 100 rated counties.

Where Nolan County sits nationally

About 14,182 people live in Nolan County, Texas, spread over 911.994 square miles. Averaged across its land area, Nolan County runs about 16 people per square mile. Among counties sharing Nolan County's EPA zone, it outranks 30% of them by population. EPA's geology-based Region 6 groups Nolan County with 502 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

A Zone 3 county like Nolan County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Nolan County testing above the action level often enough that skipping a test isn't the safe assumption.

Testing and mitigation in Nolan County

Mitigation cost doesn't depend on Nolan 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

Nolan County's test kit answers today; a Airthings radon monitor keeps answering for Nolan 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 Nolan County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.