What EPA's radon map says about Barton County

EPA places Barton County in Zone 1 - Highest Potential — a predicted county-wide average indoor radon level above 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Nationally that's the 83rd percentile for radon potential — Barton County outranks 83% of every county EPA has rated.

Barton County by the numbers

About 24,835 people live in Barton County, Kansas, spread over 895.257 square miles. Averaged across its land area, Barton County runs about 28 people per square mile. Among counties sharing Barton County's EPA zone, it outranks 51% of them by population. EPA's geology-based Region 7 groups Barton County with 411 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Barton 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 Barton County will test well under the action level, and EPA's guidance is to test regardless of zone.

Next steps for a home in Barton County

Mitigation cost doesn't depend on Barton 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 Kansas's state radon program

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

The methodology guide shows exactly which EPA and Census sources feed Barton County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.