Radon Risk in Oklahoma

Oklahoma's statewide average radon level is 3.11 pCi/L, which falls below the EPA's action level of 4 pCi/L. That's a reasonable baseline, but statewide averages can mask significant county-to-county variation. Some parts of Oklahoma run considerably higher than others.

Looking at the zone breakdown: none of Oklahoma's counties are in the high-risk Zone 1 category, 9 are Zone 2 (moderate), and 68 are Zone 3 (low). Use the county list below to find your area and see the most specific data available.

Within Oklahoma, the spread is notable. Alfalfa County has the highest measured average in the state at 29.3 pCi/L. Jefferson County sits at the other end with 0.1 pCi/L. 10 counties have a measured average above 4 pCi/L. Remember: these are averages. Individual homes can test significantly higher or lower than their county average depending on construction, foundation type, and ventilation.

Tipper's recommendation for Oklahoma residents: if you haven't tested your home, start there. A short-term test kit costs around $15 and gives you a result in 48 hours. If your home tests at or above 4 pCi/L, a professional mitigation system (typically $800–$2,000 depending on your foundation and home size) will reliably bring levels down.