Is Dickinson County, KS a radon risk area?

EPA places Dickinson 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 81st percentile for radon potential — Dickinson County outranks 81% of every county EPA has rated.

Dickinson County by the numbers

About 18,621 people live in Dickinson County, Kansas, spread over 847.068 square miles. Population density there runs about 22 people per square mile. Rank 591 by population within its EPA zone puts Dickinson County at the 45th percentile among zone peers. Geologically, Dickinson 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 Dickinson County

Dickinson County's predicted average sits above EPA's own action level of 4 pCi/L — the concentration at which EPA recommends fixing a home — versus a national average around 1.3 pCi/L indoors and 0.4 pCi/L outdoors. EPA's guidance doesn't change because of a Zone 1 label: test the house. What changes is the reason to not put it off in Dickinson County specifically.

Testing and mitigation in Dickinson County

Nothing about Dickinson 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 Kansas's state radon program

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

The methodology guide shows exactly which EPA and Census sources feed Dickinson County's numbers. Whatever zone Dickinson County carries, the zone explainer covers what it does and doesn't tell you about any one house.