Is Webster Parish, LA a radon risk area?

EPA's own radon map rates Webster Parish zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Webster Parish sits at the 19th percentile nationally for radon potential — above 19 of every 100 rated counties.

How Webster Parish compares

About 35,184 people live in Webster Parish, Louisiana, spread over 593.319 square miles. Averaged across its land area, Webster Parish runs about 59 people per square mile. Rank 438 by population within its EPA zone puts Webster Parish at the 58th percentile among zone peers. EPA's geology-based Region 6 groups Webster Parish with 502 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

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

Next steps for a home in Webster Parish

Nothing about Webster 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

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

More on how this number was built

Webster 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.