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

EPA's own radon map rates Ness County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. That puts Ness County in the 68th percentile nationally for radon potential — higher than 68% of the counties EPA has rated.

Where Ness County sits nationally

Ness County, Kansas is home to about 2,617 people across 1,074.739 square miles. That works out to roughly 2 people per square mile. By population, Ness County is the 997th largest of every county sharing its EPA zone — the 6th percentile by population within that zone. Ness County falls in EPA Radon Region 7, one of 412 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

Outdoor air nationally averages about 0.4 pCi/L, indoor air about 1.3 pCi/L — Ness County's Zone 1 prediction clears both of those and EPA's fix-it threshold besides. That doesn't mean every Ness County house tests high — a zone is a county-wide prediction, never a single-home reading — but it's a reason to test sooner rather than let it wait.

Testing and mitigation in Ness County

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

Where Ness County's figures come from

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