Madison Parish, LA radon potential

EPA's own radon map rates Madison Parish zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Nationally that's the 6th percentile for radon potential — Madison Parish outranks 6% of every county EPA has rated.

Madison Parish by the numbers

Madison Parish, Louisiana is home to about 9,093 people across 623.885 square miles. That works out to roughly 15 people per square mile. Within its own EPA zone, Madison Parish is bigger by population than 18% of the counties that share it. Madison Parish falls in EPA Radon Region 6, one of 503 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

Madison Parish's Zone 3 prediction undercuts the roughly 1.3 pCi/L most US homes average, nowhere near EPA's 4 pCi/L threshold for recommending mitigation. A Zone 3 label describes Madison Parish's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

If Madison Parish tests above the action level

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

Where Madison Parish's figures come from

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.