Topic · EPA Radon Zones
Radon risk zone by county
The EPA Map of Radon Zones classifies every US county into Zone 1 (high risk), Zone 2 (moderate), or Zone 3 (low) based on measured radon levels.
Last verified 2026-04-24 · methodology
What zipradar shows
Pages show the county zone, what the classification means for home testing recommendations, and state-level supplementary data where available.
Refresh cadence
Static 1993 baseline plus state-level supplementary updates. zipradar honors the regulator's publishing cadence; stale data is flagged rather than silently served.
Limitations
Radon is a regional indicator. Address-level radon measurement requires an at-home test kit (often free from state health departments).
Primary source
Look up radon by ZIP
ZIP 10001
New York, NY
Radon →
ZIP 11201
Brooklyn, NY
Radon →
ZIP 10016
Manhattan (Murray Hill), NY
Radon →
ZIP 02108
Boston, MA
Radon →
ZIP 02139
Cambridge, MA
Radon →
ZIP 19103
Philadelphia, PA
Radon →
ZIP 15222
Pittsburgh, PA
Radon →
ZIP 20001
Washington, DC
Radon →
ZIP 07302
Jersey City, NJ
Radon →
ZIP 06103
Hartford, CT
Radon →
ZIP 60601
Chicago, IL
Radon →
ZIP 60614
Chicago (Lincoln Park), IL
Radon →