What EPA's radon map says about Ramsey County

EPA's own radon map rates Ramsey 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 Ramsey County lands in the 99th percentile for radon potential.

Where Ramsey County sits nationally

About 542,015 people live in Ramsey County, Minnesota, spread over 152.259 square miles. That works out to roughly 3,560 people per square mile. Among counties sharing Ramsey County's EPA zone, it outranks 97% of them by population. Geologically, Ramsey County is grouped into EPA Region 5 alongside 523 other counties that share its rock and soil setting.

What this actually means for a house in Ramsey County

Ramsey County carries a Zone 1 label because its predicted average clears 4 pCi/L outright — three-plus times the 0.4 pCi/L typical outdoors and above the 1.3 pCi/L most homes see. Some Ramsey 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.

Testing and mitigation in Ramsey County

Mitigation cost doesn't depend on Ramsey 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 Minnesota's state radon program

Ramsey County's test kit answers today; a Airthings radon monitor keeps answering for Ramsey County 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

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. Whatever zone Ramsey County carries, the zone explainer covers what it does and doesn't tell you about any one house.