What EPA's radon map says about Nome Census Area

EPA places Nome Census Area 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. Nationally, Nome Census Area ranks higher in radon potential than 7% of rated counties (the 7th percentile).

Nome Census Area by the numbers

About 9,836 people live in Nome Census Area, Alaska, spread over 22,969.821 square miles. Averaged across its land area, Nome Census Area runs about 0 people per square mile. Among counties sharing Nome Census Area's EPA zone, it outranks 20% of them by population. Nome Census Area 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 Nome Census Area

Nome Census Area's Zone 3 prediction undercuts the roughly 1.3 pCi/L most US homes average, nowhere near EPA's 4 pCi/L threshold for recommending mitigation. Even at Zone 3, Nome Census Area homes are not guaranteed a low reading — zone is a county-wide average, and EPA recommends testing every home regardless of zone.

If Nome Census Area tests above the action level

Mitigation cost doesn't depend on Nome Census Area's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Alaska's state radon program

Nome Census Area's test kit answers today; a Airthings radon monitor keeps answering for Nome Census Area over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.

More on how this number was built

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