What EPA's radon map says about Moniteau County

EPA places Moniteau County in Zone 2 - Moderate Potential — a predicted county-wide average indoor radon level between 2 and 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Moniteau County sits at the 43rd percentile nationally for radon potential — above 43 of every 100 rated counties.

Where Moniteau County sits nationally

About 15,294 people live in Moniteau County, Missouri, spread over 415.033 square miles. That works out to roughly 37 people per square mile. Among counties sharing Moniteau County's EPA zone, it outranks 31% of them by population. EPA's geology-based Region 7 groups Moniteau County with 411 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Moniteau County

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Moniteau County's Zone 2 prediction lands in the gap between the two. Moniteau County's Zone 2 rating sits in the middle nationally; EPA's guidance is unchanged by that — test every home regardless of its zone.

If Moniteau County tests above the action level

Mitigation cost doesn't depend on Moniteau 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

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

Moniteau County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Moniteau County carries, the zone explainer covers what it does and doesn't tell you about any one house.