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

EPA's own radon map rates Upshur County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Nationally that's the 21st percentile for radon potential — Upshur County outranks 21% of every county EPA has rated.

Where Upshur County sits nationally

Upshur County, Texas is home to about 44,050 people across 582.98 square miles. That works out to roughly 76 people per square mile. By population, Upshur County is the 380th largest of every county sharing its EPA zone — the 63rd percentile by population within that zone. Geologically, Upshur County is grouped into EPA Region 6 alongside 502 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

Upshur 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. A Zone 3 rating means Upshur 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 Upshur County

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

Where Upshur 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. Whatever zone Upshur County carries, the zone explainer covers what it does and doesn't tell you about any one house.