Is Winn Parish, LA a radon risk area?

EPA's own radon map rates Winn Parish zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Winn Parish sits at the 9th percentile nationally for radon potential — above 9 of every 100 rated counties.

Where Winn Parish sits nationally

About 13,405 people live in Winn Parish, Louisiana, spread over 950.004 square miles. Population density there runs about 14 people per square mile. Rank 743 by population within its EPA zone puts Winn Parish at the 28th percentile among zone peers. Geologically, Winn Parish is grouped into EPA Region 6 alongside 502 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

At Zone 3, Winn 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. Don't read Zone 3 as a pass for Winn Parish — EPA's guidance to test every home makes no exception for counties predicted low.

Next steps for a home in Winn Parish

Nothing about Winn 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

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

Winn 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.