Runnels County, TX radon potential

EPA's own radon map rates Runnels County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. That puts Runnels County in the 7th percentile nationally for radon potential — higher than 7% of the counties EPA has rated.

Runnels County by the numbers

Runnels County, Texas is home to about 9,751 people across 1,051.07 square miles. Averaged across its land area, Runnels County runs about 9 people per square mile. Within its own EPA zone, Runnels County is bigger by population than 20% of the counties that share it. Runnels 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 Runnels County

A Zone 3 county like Runnels County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. Don't read Zone 3 as a pass for Runnels County — EPA's guidance to test every home makes no exception for counties predicted low.

If Runnels County tests above the action level

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find Texas's state radon program

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

Where Runnels County's figures come from

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.