Is Catahoula Parish, LA a radon risk area?

EPA places Catahoula 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. Nationally that's the 5th percentile for radon potential — Catahoula Parish outranks 5% of every county EPA has rated.

Where Catahoula Parish sits nationally

About 8,280 people live in Catahoula Parish, Louisiana, spread over 709.252 square miles. Population density there runs about 12 people per square mile. Rank 869 by population within its EPA zone puts Catahoula Parish at the 16th percentile among zone peers. Catahoula Parish falls in EPA Radon Region 6, one of 503 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Catahoula Parish

At Zone 3, Catahoula Parish's predicted county average is under the national indoor average (~1.3 pCi/L) and well below EPA's 4 pCi/L action level — outdoor air nationally runs about 0.4 pCi/L for comparison. A Zone 3 label describes Catahoula Parish's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

Testing and mitigation in Catahoula Parish

Nothing about Catahoula Parish's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Louisiana's state radon program

Catahoula Parish's test kit answers today; a Airthings radon monitor keeps answering for Catahoula Parish over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

More on how this number was built

The methodology guide shows exactly which EPA and Census sources feed Catahoula Parish's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.