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 ------- |