Is Tangipahoa Parish, LA a radon risk area?

EPA's own radon map rates Tangipahoa Parish zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Tangipahoa Parish sits at the 27th percentile nationally for radon potential — above 27 of every 100 rated counties.

How Tangipahoa Parish compares

About 139,823 people live in Tangipahoa Parish, Louisiana, spread over 791.18 square miles. Averaged across its land area, Tangipahoa Parish runs about 177 people per square mile. Rank 175 by population within its EPA zone puts Tangipahoa Parish at the 83rd percentile among zone peers. Geologically, Tangipahoa 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 Tangipahoa Parish

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Tangipahoa Parish's Zone 3 prediction is the low end of the scale. A Zone 3 rating means Tangipahoa Parish's county-wide average is predicted low, but EPA is explicit that a meaningful share of homes in low-potential zones still test above the action level — a low zone is not a reason to skip testing.

If Tangipahoa Parish tests above the action level

Nothing about Tangipahoa 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

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

The methodology guide shows exactly which EPA and Census sources feed Tangipahoa Parish's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.