Grass Valley, CA Radon Levels
Check local Grass Valley radon levels and find certified testing and mitigation professionals to keep your home safe
Grass Valley, CA Radon Facts
Perched in the Sierra Nevada foothills of Nevada County, Grass Valley's zip codes 95945 and 95949 have recorded an average radon level of 11.5 pCi/L, significantly exceeding the EPA action level. Built on gold-bearing metamorphic bedrock and granitic soils from historic mining activities, the area's Victorian-era homes and newer mountain residences often feature partial basements or crawl spaces. Given these elevated readings, all residents should test their homes and implement mitigation measures if necessary.
Based on 2 user-submitted radon tests for homes in Grass Valley, CA. The EPA recommends taking action at or above 4.0 pCi/L.
Grass Valley, CA Radon Mitigation
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Grass Valley, CA Radon Levels
User-submitted radon test readings from homes in the Grass Valley area.
| Radon Level | City | Home Age | Foundation |
|---|---|---|---|
| 10 pCi/L | Grass Valley, CA | 0-20 Years | Partial Basement |
| 13 pCi/L | Grass Valley, CA | 0-20 Years | No Basement/All Slab |
Have a radon test result for Grass Valley? Submit your reading to help other homeowners.
Radon FAQ for Grass Valley, CA
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Most Active Radon Markets in California
Cities in California with the most user-submitted radon test data, ranked by number of submissions.
| City | Avg User Radon Level | Submissions |
|---|---|---|
| Los Angeles | 7.83 pCi/L | 6 |
| Mammoth Lakes | 10.80 pCi/L | 5 |
| San Jose | 4.20 pCi/L | 5 |
| Rancho Palos Verdes | 8.00 pCi/L | 4 |
| Bishop | 6.25 pCi/L | 4 |
| Oakland | 5.00 pCi/L | 4 |
| Woodland Hills | 7.67 pCi/L | 3 |
| South Lake Tahoe | 6.33 pCi/L | 3 |
| Palos Verdes Peninsula | 6.00 pCi/L | 3 |
| Sacramento | 4.33 pCi/L | 3 |