Lafayette County, MO Radon Zone Data

Lafayette County, MO: EPA's radon zone, explained

EPA places Lafayette 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. Rank it against the rest of the country and Lafayette County lands in the 51st percentile for radon potential.

Lafayette County by the numbers

Lafayette County, Missouri is home to about 33,511 people across 628.284 square miles. Averaged across its land area, Lafayette County runs about 53 people per square mile. By population, Lafayette County is the 455th largest of every county sharing its EPA zone — the 56th percentile by population within that zone. Lafayette County falls in EPA Radon Region 7, one of 412 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Lafayette 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 Lafayette County address — a moderate county average still leaves individual homes to test either side of it.

Testing and mitigation in Lafayette County

For a Lafayette County homeowner, the order is simple: test first, since a kit costs a small fraction of what mitigation would. Only if the result clears 4 pCi/L does a system — typically $800–$2,500, about $1,200 for a common install — become worth pricing out.

Find Missouri's state radon program

For Lafayette County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Lafayette 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 Lafayette County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Lafayette County's numbers. Whatever zone Lafayette County carries, the zone explainer covers what it does and doesn't tell you about any one house.