What EPA's radon map says about Iberville Parish

Iberville Parish is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Nationally that's the 17th percentile for radon potential — Iberville Parish outranks 17% of every county EPA has rated.

How Iberville Parish compares

About 29,766 people live in Iberville Parish, Louisiana, spread over 617.275 square miles. That works out to roughly 48 people per square mile. Among counties sharing Iberville Parish's EPA zone, it outranks 53% of them by population. Iberville Parish falls in EPA Radon Region 6, one of 503 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Iberville Parish

At Zone 3, Iberville 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. Even at Zone 3, Iberville Parish homes are not guaranteed a low reading — zone is a county-wide average, and EPA recommends testing every home regardless of zone.

Testing and mitigation in Iberville Parish

Mitigation cost doesn't depend on Iberville Parish's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Louisiana's state radon program

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

More on how this number was built

Iberville Parish's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Iberville Parish carries, the zone explainer covers what it does and doesn't tell you about any one house.