What EPA's radon map says about Floyd County

EPA places Floyd County in Zone 2 - Moderate Potential — a predicted county-wide average indoor radon level between 2 and 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Nationally that's the 36th percentile for radon potential — Floyd County outranks 36% of every county EPA has rated.

How Floyd County compares

About 5,042 people live in Floyd County, Texas, spread over 992.143 square miles. Averaged across its land area, Floyd County runs about 5 people per square mile. Among counties sharing Floyd County's EPA zone, it outranks 9% of them by population. Geologically, Floyd 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

EPA's Zone 2 rating for Floyd County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. A county-wide moderate average, like Floyd County's, can still hide a specific house well above or below it — testing is what actually answers the question.

If Floyd County tests above the action level

Mitigation cost doesn't depend on Floyd 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

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

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