Is Norton County, KS a radon risk area?

Norton County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Norton County sits at the 71st percentile nationally for radon potential — above 71 of every 100 rated counties.

Norton County by the numbers

About 5,335 people live in Norton County, Kansas, spread over 878.044 square miles. Population density there runs about 6 people per square mile. Rank 910 by population within its EPA zone puts Norton County at the 15th percentile among zone peers. Norton County falls in EPA Radon Region 7, one of 412 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

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

Next steps for a home in Norton County

Nothing about Norton 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

Norton County's test kit answers today; a Airthings radon monitor keeps answering for Norton 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 Norton County's numbers. Whatever zone Norton County carries, the zone explainer covers what it does and doesn't tell you about any one house.