MONTANA - EPA Map of Radon Zones
http://www.epa.gov/radon/zonemap.html
The purpose of this map is to assist National, State and local organizations to target their resources and to
implement radon-resistant building codes.
This map is not intended to determine if a home in a given zone should be tested for radon.
Homes with elevated levels of radon have been found in all three zones.
All homes should be tested, regardless of zone designation.
LINCOLN
FLATHEAD
LIB-
ERTY
PONDERA
DANIELS
BLAINE
SANDERS
SHERIDAN
LAKE
VALLEY
TETON
PHILLIPS
CHOUTEAU
LEWIS
AND
7 CLARK
RICHLAND
MISSOULA
MCCONE
JUDITH
BASIN
GARFIELD
PETRO-
LEUM
POWELL
DAWSON
GRANITE
MEAGHER
RAVALLI
BROAD-
WATER
'HEATLAND
~ WI-
BAUX
MUSSELSHELL
PRAIRIE
SILVER
\BOW
30LDENX
VALLEY
TREA-
TS URE
ROSEBUD
GALLATIN
FALLON
YELLOW-
STONE
STILL-
WATER
PARK
MADISON
BEAVERHEAD
BIG HORN
CARBON
POWDER RIVER
YELLOWSTONE
PARK
IMPORTANT: Consult the publication entitled
"Preliminary Geologic Radon Potential Assessment of
Montana" (USGS Open-file Report 93-292-H) before
using this map. See
http://energy.cr.usgs.gov/radon/grpinfo.html This
document contains information on radon potential
variations within counties. EPA also recommends that
this map be supplemented with any available local data
in order to further understand and predict the radon
potential of a specific area.
Zone 1 Zone 2
Zone 3

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