What EPA's radon map says about Falls County

EPA's own radon map rates Falls County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Rank it against the rest of the country and Falls County lands in the 12th percentile for radon potential.

Falls County by the numbers

About 17,752 people live in Falls County, Texas, spread over 765.495 square miles. Population density there runs about 23 people per square mile. Among counties sharing Falls County's EPA zone, it outranks 35% of them by population. EPA's geology-based Region 6 groups Falls County with 502 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

A Zone 3 county like Falls County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. Even at Zone 3, Falls County homes are not guaranteed a low reading — zone is a county-wide average, and EPA recommends testing every home regardless of zone.

Next steps for a home in Falls County

Mitigation cost doesn't depend on Falls 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

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

Falls County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Falls County carries, the zone explainer covers what it does and doesn't tell you about any one house.