West Carroll Parish, LA: EPA's radon zone, explained

EPA's own radon map rates West Carroll Parish zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Nationally that's the 6th percentile for radon potential — West Carroll Parish outranks 6% of every county EPA has rated.

Where West Carroll Parish sits nationally

West Carroll Parish, Louisiana is home to about 9,254 people across 359.686 square miles. That works out to roughly 26 people per square mile. By population, West Carroll Parish is the 841st largest of every county sharing its EPA zone — the 18th percentile by population within that zone. West Carroll 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 West Carroll Parish is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like West Carroll Parish testing above the action level often enough that skipping a test isn't the safe assumption.

If West Carroll Parish tests above the action level

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

Where West Carroll Parish's figures come from

West Carroll Parish'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.