Is Crawford County, IA a radon risk area?

Crawford County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Crawford County sits at the 80th percentile nationally for radon potential — above 80 of every 100 rated counties.

How Crawford County compares

About 16,378 people live in Crawford County, Iowa, spread over 714.198 square miles. Population density there runs about 23 people per square mile. Rank 634 by population within its EPA zone puts Crawford County at the 41st percentile among zone peers. EPA's geology-based Region 7 groups Crawford County with 411 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Crawford County carries a Zone 1 label because its predicted average clears 4 pCi/L outright — three-plus times the 0.4 pCi/L typical outdoors and above the 1.3 pCi/L most homes see. Being in Zone 1 raises the odds Crawford County homes test above the action level, but it does not mean any specific house does — EPA recommends every home be tested, in every zone, because the only way to know is to test.

If Crawford County tests above the action level

Nothing about Crawford 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 Iowa's state radon program

Crawford County's test kit answers today; a Airthings radon monitor keeps answering for Crawford County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 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. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.