Is Stephens County, TX a radon risk area?

EPA places Stephens 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. Rank it against the rest of the country and Stephens County lands in the 6th percentile for radon potential.

How Stephens County compares

About 9,475 people live in Stephens County, Texas, spread over 896.721 square miles. Population density there runs about 11 people per square mile. Rank 833 by population within its EPA zone puts Stephens County at the 19th percentile among zone peers. Stephens County falls in EPA Radon Region 6, one of 503 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

Stephens County's predicted average sits below the national indoor average of about 1.3 pCi/L, well under EPA's 4 pCi/L action level. Don't read Zone 3 as a pass for Stephens County — EPA's guidance to test every home makes no exception for counties predicted low.

Testing and mitigation in Stephens County

Nothing about Stephens County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Texas's state radon program

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

Stephens County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.