What EPA's radon map says about Burleigh County

EPA places Burleigh 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. Burleigh County sits at the 94th percentile nationally for radon potential — above 94 of every 100 rated counties.

Where Burleigh County sits nationally

About 103,107 people live in Burleigh County, North Dakota, spread over 1,632.695 square miles. Population density there runs about 63 people per square mile. Among counties sharing Burleigh County's EPA zone, it outranks 82% of them by population. Burleigh County falls in EPA Radon Region 8, one of 291 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Fixing a home becomes an EPA recommendation past 4 pCi/L, and that is precisely the side of the line Burleigh County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. Some Burleigh County homes will test comfortably under the action level despite the county's Zone 1 rating — the only way to know which kind of home you have is an actual test.

Next steps for a home in Burleigh County

Mitigation cost doesn't depend on Burleigh County'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 North Dakota's state radon program

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

More on how this number was built

The methodology guide shows exactly which EPA and Census sources feed Burleigh County's numbers. Whatever zone Burleigh County carries, the zone explainer covers what it does and doesn't tell you about any one house.