Caddo County, OK: EPA's radon zone, explained

EPA's own radon map rates Caddo County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Nationally that's the 16th percentile for radon potential — Caddo County outranks 16% of every county EPA has rated.

How Caddo County compares

Caddo County, Oklahoma is home to about 26,337 people across 1,277.754 square miles. Population density there runs about 21 people per square mile. By population, Caddo County is the 523rd largest of every county sharing its EPA zone — the 49th percentile by population within that zone. EPA's geology-based Region 6 groups Caddo County with 502 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Caddo County'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 Caddo County'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 Caddo County

For a Caddo County homeowner, the order is simple: test first, since a kit costs a small fraction of what mitigation would. Only if the result clears 4 pCi/L does a system — typically $800–$2,500, about $1,200 for a common install — become worth pricing out.

Find Oklahoma's state radon program

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

Where Caddo County'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.