What EPA's radon map says about Bollinger County

EPA places Bollinger 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. That puts Bollinger County in the 40th percentile nationally for radon potential — higher than 40% of the counties EPA has rated.

How Bollinger County compares

About 10,610 people live in Bollinger County, Missouri, spread over 617.904 square miles. Averaged across its land area, Bollinger County runs about 17 people per square mile. Among counties sharing Bollinger County's EPA zone, it outranks 22% of them by population. Geologically, Bollinger County is grouped into EPA Region 7 alongside 411 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

EPA's Zone 2 rating for Bollinger County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. Bollinger County's Zone 2 rating sits in the middle nationally; EPA's guidance is unchanged by that — test every home regardless of its zone.

Testing and mitigation in Bollinger County

Mitigation cost doesn't depend on Bollinger 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

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

Bollinger County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.