Towner County, ND: EPA's radon zone, explained

EPA's own radon map rates Towner 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 Towner County lands in the 67th percentile for radon potential.

Where Towner County sits nationally

Towner County, North Dakota is home to about 2,051 people across 1,025.129 square miles. Population density there runs about 2 people per square mile. By population, Towner County is the 1031st largest of every county sharing its EPA zone — the 3rd percentile by population within that zone. Towner County falls in EPA Radon Region 8, one of 291 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

Fixing a home becomes an EPA recommendation past 4 pCi/L, and that is precisely the side of the line Towner County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. That doesn't mean every Towner 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 Towner County

For a Towner 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 North Dakota's state radon program

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

Where Towner County's figures come from

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.