Trigg County, KY: EPA's radon zone, explained

EPA's own radon map rates Trigg County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Nationally that's the 43rd percentile for radon potential — Trigg County outranks 43% of every county EPA has rated.

How Trigg County compares

Trigg County, Kentucky is home to about 14,559 people across 441.433 square miles. That works out to roughly 33 people per square mile. By population, Trigg County is the 724th largest of every county sharing its EPA zone — the 30th percentile by population within that zone. Trigg County falls in EPA Radon Region 4, one of 736 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

Trigg 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). A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Trigg County — testing is the only way to know an individual home's actual level.

Testing and mitigation in Trigg County

For a Trigg 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 Kentucky's state radon program

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

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.