Somervell County, TX: EPA's radon zone, explained

EPA's own radon map rates Somervell County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Somervell County sits at the 7th percentile nationally for radon potential — above 7 of every 100 rated counties.

How Somervell County compares

Somervell County, Texas is home to about 10,098 people across 186.207 square miles. Averaged across its land area, Somervell County runs about 54 people per square mile. By population, Somervell County is the 818th largest of every county sharing its EPA zone — the 21st percentile by population within that zone. Somervell County falls in EPA Radon Region 6, one of 503 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Somervell County

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Somervell County's Zone 3 prediction is the low end of the scale. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Somervell County testing above the action level often enough that skipping a test isn't the safe assumption.

Testing and mitigation in Somervell County

For a Somervell County homeowner, the order is simple: test first, since a kit costs a small fraction of what mitigation would. Only if the result clears 4 pCi/L does a system — typically $800–$2,500, about $1,200 for a common install — become worth pricing out.

Find Texas's state radon program

For Somervell County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Somervell County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.

Where Somervell County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Somervell County's numbers. Whatever zone Somervell County carries, the zone explainer covers what it does and doesn't tell you about any one house.