Is Rapides Parish, LA a radon risk area?

EPA's own radon map rates Rapides Parish zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Nationally, Rapides Parish ranks higher in radon potential than 27% of rated counties (the 27th percentile).

How Rapides Parish compares

About 125,899 people live in Rapides Parish, Louisiana, spread over 1,324.08 square miles. That works out to roughly 95 people per square mile. Rank 191 by population within its EPA zone puts Rapides Parish at the 82nd percentile among zone peers. Rapides 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

Rapides 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. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Rapides Parish testing above the action level often enough that skipping a test isn't the safe assumption.

Testing and mitigation in Rapides Parish

Nothing about Rapides 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

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

Rapides Parish's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.