Ste. Genevieve County, MO radon potential

Ste. Genevieve 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. Nationally that's the 45th percentile for radon potential — Ste. Genevieve County outranks 45% of every county EPA has rated.

Ste. Genevieve County by the numbers

Ste. Genevieve County, Missouri is home to about 18,546 people across 499.163 square miles. Population density there runs about 37 people per square mile. Within its own EPA zone, Ste. Genevieve County is bigger by population than 37% of the counties that share it. Ste. Genevieve 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

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Ste. Genevieve County's Zone 2 prediction lands in the gap between the two. A county-wide moderate average, like Ste. Genevieve County's, can still hide a specific house well above or below it — testing is what actually answers the question.

Next steps for a home in Ste. Genevieve County

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find Missouri's state radon program

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

Where Ste. Genevieve County's figures come from

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