Granby, CO Radon Levels
Check local Granby radon levels and find certified testing and mitigation professionals to keep your home safe
Granby, CO Radon Facts
High in the Colorado Rockies, Granby in Grand County has recorded an average radon level of 8.6 pCi/L, more than double the EPA action threshold. Mountain geology and elevation can create significant radon accumulation in homes throughout zip codes 80451 and 80446.
Based on 4 user-submitted radon tests for homes in Granby, CO. The EPA recommends taking action at or above 4.0 pCi/L.
Granby, CO Radon Mitigation
Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.
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Granby, CO Radon Levels
User-submitted radon test readings from homes in the Granby area.
| Radon Level | City | Home Age | Foundation |
|---|---|---|---|
| 6 pCi/L | Granby, CO | 0-20 Years | No Basement/All Crawl Space |
| 17 pCi/L | Granby, CO | 21-50 Years | No Basement/All Crawl Space |
| 7 pCi/L | Granby, CO | 21-50 Years | Full Basement |
Have a radon test result for Granby? Submit your reading to help other homeowners.
Radon Readings Near Granby, CO
Compare radon levels in Granby with the closest nearby cities that have user-submitted test data.
| City | Distance | Avg User Level | Readings |
|---|---|---|---|
| Grand Lake | 13.0 mi | 6.00 pCi/L | 2 |
| Kremmling | 21.0 mi | 20.00 pCi/L | 2 |
| Silverthorne | 24.3 mi | 10.00 pCi/L | 3 |
| Idaho Springs | 31.3 mi | 4.00 pCi/L | 1 |
| Black Hawk | 32.9 mi | 13.00 pCi/L | 4 |
| Dillon | 33.0 mi | 8.50 pCi/L | 2 |
| Vail | 33.8 mi | 6.00 pCi/L | 1 |
| Golden | 34.3 mi | 9.00 pCi/L | 2 |
Grand County Radon Profile
Because of its underlying geology, Grand County is mapped as EPA Radon Zone 1 — the most elevated classification — where predicted indoor screening averages exceed 4 pCi/L. Homeowner-submitted tests from 3 cities in Grand County average 11.00 pCi/L across 8 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. As the second leading cause of lung cancer in the U.S., radon warrants testing in every Grand County home regardless of zone or a neighbor's results.