Is Crosby County, TX a radon risk area?

EPA's own radon map rates Crosby County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Crosby County sits at the 36th percentile nationally for radon potential — above 36 of every 100 rated counties.

Where Crosby County sits nationally

About 5,030 people live in Crosby County, Texas, spread over 900.199 square miles. That works out to roughly 6 people per square mile. Rank 941 by population within its EPA zone puts Crosby County at the 9th percentile among zone peers. Geologically, Crosby 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

Crosby County's predicted average falls between EPA's 4 pCi/L action level and the national indoor average of about 1.3 pCi/L (outdoor air runs roughly 0.4 pCi/L). Nothing about a Zone 2 label lowers the case for testing in Crosby County — EPA recommends it in every zone, moderate included.

Testing and mitigation in Crosby County

Nothing about Crosby County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Texas's state radon program

Crosby County's test kit answers today; a Airthings radon monitor keeps answering for Crosby County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

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