Is Edwards County, TX a radon risk area?

EPA's own radon map rates Edwards County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. That puts Edwards County in the 1st percentile nationally for radon potential — higher than 1% of the counties EPA has rated.

Edwards County by the numbers

About 1,383 people live in Edwards County, Texas, spread over 2,117.872 square miles. Population density there runs about 1 people per square mile. Rank 1004 by population within its EPA zone puts Edwards County at the 3rd percentile among zone peers. Edwards 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

A Zone 3 county like Edwards County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. A Zone 3 rating means Edwards County's county-wide average is predicted low, but EPA is explicit that a meaningful share of homes in low-potential zones still test above the action level — a low zone is not a reason to skip testing.

Testing and mitigation in Edwards County

Nothing about Edwards 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

Edwards County's test kit answers today; a Airthings radon monitor keeps answering for Edwards County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

More on how this number was built

The methodology guide shows exactly which EPA and Census sources feed Edwards County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.