Is Vernon Parish, LA a radon risk area?

Vernon Parish is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Vernon Parish sits at the 21st percentile nationally for radon potential — above 21 of every 100 rated counties.

Vernon Parish by the numbers

About 45,819 people live in Vernon Parish, Louisiana, spread over 1,326.728 square miles. Averaged across its land area, Vernon Parish runs about 35 people per square mile. Rank 367 by population within its EPA zone puts Vernon Parish at the 64th percentile among zone peers. EPA's geology-based Region 6 groups Vernon Parish with 502 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

A Zone 3 county like Vernon 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 Vernon Parish testing above the action level often enough that skipping a test isn't the safe assumption.

Testing and mitigation in Vernon Parish

Nothing about Vernon 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

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

More on how this number was built

Vernon 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.