What EPA's radon map says about Red River Parish

EPA's own radon map rates Red River Parish zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Nationally that's the 4th percentile for radon potential — Red River Parish outranks 4% of every county EPA has rated.

Red River Parish by the numbers

About 7,238 people live in Red River Parish, Louisiana, spread over 388.98 square miles. Averaged across its land area, Red River Parish runs about 19 people per square mile. Among counties sharing Red River Parish's EPA zone, it outranks 13% of them by population. Geologically, Red River Parish is grouped into EPA Region 6 alongside 502 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

At Zone 3, Red River 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 rating means Red River 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.

If Red River Parish tests above the action level

Mitigation cost doesn't depend on Red River 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

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

More on how this number was built

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. Whatever zone Red River Parish carries, the zone explainer covers what it does and doesn't tell you about any one house.