Cloud County, KS: EPA's radon zone, explained

Cloud County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Rank it against the rest of the country and Cloud County lands in the 74th percentile for radon potential.

Where Cloud County sits nationally

Cloud County, Kansas is home to about 8,723 people across 715.342 square miles. Averaged across its land area, Cloud County runs about 12 people per square mile. By population, Cloud County is the 805th largest of every county sharing its EPA zone — the 24th percentile by population within that zone. EPA's geology-based Region 7 groups Cloud County with 411 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Cloud 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. A Zone 1 rating means testing is worth doing sooner rather than later, but it is still county-wide average, not a reading for any single house — some homes in Cloud County will test well under the action level, and EPA's guidance is to test regardless of zone.

Testing and mitigation in Cloud County

For a Cloud 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 Kansas's state radon program

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

Where Cloud County's figures come from

Cloud County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.