Is Caldwell Parish, LA a radon risk area?

Caldwell Parish is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. That puts Caldwell Parish in the 6th percentile nationally for radon potential — higher than 6% of the counties EPA has rated.

How Caldwell Parish compares

About 9,393 people live in Caldwell Parish, Louisiana, spread over 529.77 square miles. Averaged across its land area, Caldwell Parish runs about 18 people per square mile. Rank 837 by population within its EPA zone puts Caldwell Parish at the 19th percentile among zone peers. EPA's geology-based Region 6 groups Caldwell Parish with 502 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Caldwell Parish's predicted average sits below the national indoor average of about 1.3 pCi/L, well under EPA's 4 pCi/L action level. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Caldwell Parish testing above the action level often enough that skipping a test isn't the safe assumption.

Next steps for a home in Caldwell Parish

Nothing about Caldwell 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

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

Caldwell 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.