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

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

Sutton County by the numbers

Sutton County, Texas is home to about 3,269 people across 1,453.935 square miles. Averaged across its land area, Sutton County runs about 2 people per square mile. By population, Sutton County is the 972nd largest of every county sharing its EPA zone — the 6th percentile by population within that zone. Geologically, Sutton 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 Sutton County

Sutton 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 Sutton 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 Sutton County tests above the action level

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

Where Sutton County's figures come from

Sutton County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.