Is St. Bernard Parish, LA a radon risk area?

EPA's own radon map rates St. Bernard Parish zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. That puts St. Bernard Parish in the 21st percentile nationally for radon potential — higher than 21% of the counties EPA has rated.

Where St. Bernard Parish sits nationally

About 44,783 people live in St. Bernard Parish, Louisiana, spread over 377.528 square miles. That works out to roughly 119 people per square mile. Rank 371 by population within its EPA zone puts St. Bernard Parish at the 64th percentile among zone peers. St. Bernard 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 St. Bernard Parish

At Zone 3, St. Bernard 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. Even at Zone 3, St. Bernard Parish homes are not guaranteed a low reading — zone is a county-wide average, and EPA recommends testing every home regardless of zone.

If St. Bernard Parish tests above the action level

Nothing about St. Bernard 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

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

More on how this number was built

St. Bernard Parish's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.