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

Jasper County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Jasper County sits at the 18th percentile nationally for radon potential — above 18 of every 100 rated counties.

Jasper County by the numbers

Jasper County, Texas is home to about 32,907 people across 938.655 square miles. That works out to roughly 35 people per square mile. By population, Jasper County is the 458th largest of every county sharing its EPA zone — the 56th percentile by population within that zone. Geologically, Jasper County is grouped into EPA Region 6 alongside 502 other counties that share its rock and soil setting.

What this actually means for a house in Jasper County

Jasper County's Zone 3 prediction undercuts the roughly 1.3 pCi/L most US homes average, nowhere near EPA's 4 pCi/L threshold for recommending mitigation. A Zone 3 label describes Jasper County's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

If Jasper County tests above the action level

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

Where Jasper County's figures come from

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