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State overview
Radon in Montana
Of Montana's 56 counties and county equivalents, EPA places 49 in Zone 1, 7 in Zone 2. Zones are county-wide predictions; testing is the only way to know your home's level.
Radon in the news
Montana stories
- Explore Montana: Stunning Views, Rocks That Chime Like Bells And Bathing In Radon GasCowboy State Daily · 2025-08-17
- Free radon test kits available to Montana residents in JanuaryNonStop Local Montana · 2025-01-02
- The Montana Department of Environmental Quality is giving out free Radon test kitsKTVH · 2024-01-04
- Why are people hanging out in Montana's radon-filled mines?Montana Public Radio · 2023-01-18
Headlines link to the original publishers via Google News. Updated 2026-10-27.
All 56 counties
Source: EPA radon zones spreadsheet (EPA 402/A-16/001).