What EPA's radon map says about Plaquemines Parish

Plaquemines Parish is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Rank it against the rest of the country and Plaquemines Parish lands in the 15th percentile for radon potential.

Plaquemines Parish by the numbers

About 22,289 people live in Plaquemines Parish, Louisiana, spread over 780.595 square miles. That works out to roughly 29 people per square mile. Among counties sharing Plaquemines Parish's EPA zone, it outranks 45% of them by population. EPA's geology-based Region 6 groups Plaquemines Parish with 502 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

At Zone 3, Plaquemines 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. A Zone 3 label describes Plaquemines Parish's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

Testing and mitigation in Plaquemines Parish

Mitigation cost doesn't depend on Plaquemines 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

Plaquemines Parish's test kit answers today; a Airthings radon monitor keeps answering for Plaquemines 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 Plaquemines Parish's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.