Radon · Connecticut
Radon in Connecticut
Radon (EPA Radon Zones) data for ZIP codes in Connecticut. Pick a ZIP below to dive into the radon summary.
Last verified 2026-04-25 · methodology
What lands here
Pages show the county zone, what the classification means for home testing recommendations, and state-level supplementary data where available.
Source & refresh
EPA Radon Zones. Refreshed static 1993 baseline plus state-level supplementary updates. Primary source →