What EPA's radon map says about Dade County

Dade County is mapped as Zone 2 - Moderate Potential by EPA — meaning the county-wide average indoor level is predicted between 2 and 4 pCi/L. Rank it against the rest of the country and Dade County lands in the 38th percentile for radon potential.

How Dade County compares

About 7,622 people live in Dade County, Missouri, spread over 490.01 square miles. Population density there runs about 16 people per square mile. Among counties sharing Dade County's EPA zone, it outranks 15% of them by population. Dade County falls in EPA Radon Region 7, one of 412 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

Dade County's predicted average falls between EPA's 4 pCi/L action level and the national indoor average of about 1.3 pCi/L (outdoor air runs roughly 0.4 pCi/L). Middle-of-the-pack doesn't mean risk-free for any one Dade County address — a moderate county average still leaves individual homes to test either side of it.

If Dade County tests above the action level

Mitigation cost doesn't depend on Dade 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 Missouri's state radon program

Dade County's test kit answers today; a Airthings radon monitor keeps answering for Dade County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 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 Dade County carries, the zone explainer covers what it does and doesn't tell you about any one house.