Denali Borough, AK: EPA's radon zone, explained

EPA places Denali Borough in Zone 3 - Low Potential — a predicted county-wide average indoor radon level below 2 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Rank it against the rest of the country and Denali Borough lands in the 1st percentile for radon potential.

Where Denali Borough sits nationally

Denali Borough, Alaska is home to about 1,621 people across 12,639.746 square miles. Averaged across its land area, Denali Borough runs about 0 people per square mile. By population, Denali Borough is the 998th largest of every county sharing its EPA zone — the 3rd percentile by population within that zone. Denali Borough falls in EPA Radon Region 10, one of 142 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Denali Borough

Denali Borough's predicted average sits below the national indoor average of about 1.3 pCi/L, well under EPA's 4 pCi/L action level. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Denali Borough testing above the action level often enough that skipping a test isn't the safe assumption.

Testing and mitigation in Denali Borough

For a Denali Borough 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 Alaska's state radon program

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

Where Denali Borough'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. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.