Franklin Parish, LA: EPA's radon zone, explained

EPA places Franklin Parish in Zone 3 - Low Potential — a predicted county-wide average indoor radon level below 2 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Franklin Parish sits at the 13th percentile nationally for radon potential — above 13 of every 100 rated counties.

Franklin Parish by the numbers

Franklin Parish, Louisiana is home to about 19,107 people across 624.298 square miles. That works out to roughly 31 people per square mile. By population, Franklin Parish is the 640th largest of every county sharing its EPA zone — the 38th percentile by population within that zone. Franklin Parish falls in EPA Radon Region 6, one of 503 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

A Zone 3 county like Franklin Parish is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. Don't read Zone 3 as a pass for Franklin Parish — EPA's guidance to test every home makes no exception for counties predicted low.

Testing and mitigation in Franklin Parish

For a Franklin Parish 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 Louisiana's state radon program

For Franklin Parish, an ongoing number beats a one-time test - a Airthings radon monitor tracks Franklin Parish's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.

Where Franklin Parish'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.