Logan County, ND Radon Zone Data

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

EPA places Logan 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. That puts Logan County in the 67th percentile nationally for radon potential — higher than 67% of the counties EPA has rated.

Logan County by the numbers

Logan County, North Dakota is home to about 1,880 people across 992.599 square miles. Averaged across its land area, Logan County runs about 2 people per square mile. By population, Logan County is the 1034th largest of every county sharing its EPA zone — the 3rd percentile by population within that zone. Logan 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 Logan County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. That doesn't mean every Logan 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.

If Logan County tests above the action level

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

Where Logan County's figures come from

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