Lafourche Parish, LA radon potential

EPA's own radon map rates Lafourche Parish zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Rank it against the rest of the country and Lafourche Parish lands in the 26th percentile for radon potential.

Where Lafourche Parish sits nationally

Lafourche Parish, Louisiana is home to about 95,342 people across 1,069.696 square miles. That works out to roughly 89 people per square mile. Within its own EPA zone, Lafourche Parish is bigger by population than 78% of the counties that share it. Geologically, Lafourche Parish is grouped into EPA Region 6 alongside 502 other counties that share its rock and soil setting.

Zone vs. an actual test

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Lafourche Parish's Zone 3 prediction is the low end of the scale. A Zone 3 rating means Lafourche 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.

Next steps for a home in Lafourche Parish

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find Louisiana's state radon program

For Lafourche Parish, an ongoing number beats a one-time test - a Airthings radon monitor tracks Lafourche Parish's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

Where Lafourche Parish's figures come from

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