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

EPA's own radon map rates Logan County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Rank it against the rest of the country and Logan County lands in the 68th percentile for radon potential.

Logan County by the numbers

Logan County, Kansas is home to about 2,694 people across 1,072.993 square miles. Population density there runs about 3 people per square mile. By population, Logan County is the 994th largest of every county sharing its EPA zone — the 7th percentile by population within that zone. Geologically, Logan County is grouped into EPA Region 7 alongside 411 other counties that share its rock and soil setting.

What this actually means for a house in Logan County

Outdoor air nationally averages about 0.4 pCi/L, indoor air about 1.3 pCi/L — Logan County's Zone 1 prediction clears both of those and EPA's fix-it threshold besides. Some Logan County homes will test comfortably under the action level despite the county's Zone 1 rating — the only way to know which kind of home you have is an actual test.

Next steps for a home in Logan County

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

Where Logan County's figures come from

Logan County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.