What EPA's radon map says about Upton County

Upton County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Nationally that's the 2nd percentile for radon potential — Upton County outranks 2% of every county EPA has rated.

How Upton County compares

About 3,128 people live in Upton County, Texas, spread over 1,241.323 square miles. Averaged across its land area, Upton County runs about 3 people per square mile. Among counties sharing Upton County's EPA zone, it outranks 5% of them by population. EPA's geology-based Region 6 groups Upton County with 502 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Upton 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 Upton 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 Upton County tests above the action level

Mitigation cost doesn't depend on Upton County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Texas's state radon program

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

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. Whatever zone Upton County carries, the zone explainer covers what it does and doesn't tell you about any one house.