Martin County, TX radon potential

Martin County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Nationally, Martin County ranks higher in radon potential than 3% of rated counties (the 3rd percentile).

Where Martin County sits nationally

Martin County, Texas is home to about 5,179 people across 914.956 square miles. That works out to roughly 6 people per square mile. Within its own EPA zone, Martin County is bigger by population than 9% of the counties that share it. Geologically, Martin 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 Martin County

A Zone 3 county like Martin County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. A Zone 3 label describes Martin County's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

Next steps for a home in Martin County

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find Texas's state radon program

For Martin County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Martin 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 Martin County's figures come from

Martin County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Martin County carries, the zone explainer covers what it does and doesn't tell you about any one house.