Is Calcasieu Parish, LA a radon risk area?

Calcasieu Parish is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Calcasieu Parish sits at the 29th percentile nationally for radon potential — above 29 of every 100 rated counties.

Calcasieu Parish by the numbers

About 206,861 people live in Calcasieu Parish, Louisiana, spread over 1,064.189 square miles. That works out to roughly 194 people per square mile. Rank 128 by population within its EPA zone puts Calcasieu Parish at the 88th percentile among zone peers. Geologically, Calcasieu Parish is grouped into EPA Region 6 alongside 502 other counties that share its rock and soil setting.

What this actually means for a house in Calcasieu Parish

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Calcasieu Parish's Zone 3 prediction is the low end of the scale. Even at Zone 3, Calcasieu Parish homes are not guaranteed a low reading — zone is a county-wide average, and EPA recommends testing every home regardless of zone.

Testing and mitigation in Calcasieu Parish

Nothing about Calcasieu 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

Calcasieu Parish's test kit answers today; a Airthings radon monitor keeps answering for Calcasieu 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

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. Whatever zone Calcasieu Parish carries, the zone explainer covers what it does and doesn't tell you about any one house.