EPA MAP OF RADON ZONESFind your county’s
Find your county’s
EPA zone.
Search by county or state name. These are area-level potential categories, not measured radon levels in individual homes.
COUNTY SEARCH
Search the published zone table.
County names follow the 2020 Census. If a county equivalent has no clear match to EPA’s list, the result will say so.
WHAT THE MAP CAN’T TELL YOU
Your address needs a test.
The EPA map estimates broad indoor radon potential using old regional inputs. It cannot tell whether one home is above or below EPA’s action level. EPA recommends testing all homes, including those in Zone 3.