Is Jim Wells County, TX a radon risk area?

Jim Wells County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Jim Wells County sits at the 20th percentile nationally for radon potential — above 20 of every 100 rated counties.

Jim Wells County by the numbers

About 38,886 people live in Jim Wells County, Texas, spread over 865.176 square miles. Population density there runs about 45 people per square mile. Rank 410 by population within its EPA zone puts Jim Wells County at the 60th percentile among zone peers. EPA's geology-based Region 6 groups Jim Wells County with 502 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Jim Wells County

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Jim Wells County's Zone 3 prediction is the low end of the scale. A Zone 3 rating means Jim Wells 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.

If Jim Wells County tests above the action level

Nothing about Jim Wells 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

Jim Wells County's test kit answers today; a Airthings radon monitor keeps answering for Jim Wells 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 Jim Wells County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.