Atchison County, MO radon potential

EPA's own radon map rates Atchison County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Nationally that's the 71st percentile for radon potential — Atchison County outranks 71% of every county EPA has rated.

How Atchison County compares

Atchison County, Missouri is home to about 5,139 people across 547.285 square miles. Population density there runs about 9 people per square mile. Within its own EPA zone, Atchison County is bigger by population than 14% of the counties that share it. Atchison County falls in EPA Radon Region 7, one of 412 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Where the national indoor average runs about 1.3 pCi/L, Atchison County's Zone 1 rating puts its predicted county average above EPA's 4 pCi/L action level itself. Some Atchison 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.

Next steps for a home in Atchison 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 Atchison County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Atchison 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 Atchison County's figures come from

Atchison County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.