San Diego, CA Radon Mitigation and Testing
Downtown San Diego County in zip code 92101 shows radon levels averaging 3.5 pCi/L, which falls within EPA recommended ranges but still warrants attention. The area's coastal mesa geology, featuring marine sedimentary bedrock typical of Southern California, generally produces moderate radon potential. While current readings suggest acceptable levels, continued testing helps ensure long-term residential safety in this urban core area.
Based on 2 user-submitted radon tests for homes in San Diego, CA. The EPA recommends taking action at or above 4.0 pCi/L.
San Diego, CA Radon Mitigation
Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.
San Diego, CA Radon Testing
Finding qualified radon testing professionals is the first step toward protecting your home.
San Diego, California Radon Levels
User-submitted radon test readings from homes in the San Diego area.
| Radon Level | City | Home Age | Foundation | Submitted |
|---|---|---|---|---|
| 4 pCi/L | San Diego, CA | 51-99 Years | No Basement/All Slab | Dec 2020 |
| 3 pCi/L | San Diego, CA | 0-20 Years | Partial Basement | Nov 2020 |
Have a radon test result for San Diego? Submit your reading to help other homeowners.
San Diego Radon Facts
Key details about the radon risk profile for San Diego and the 92101 zip code area.
San Diego and the 92101 zip code are located in San Diego County, which has an EPA assigned Radon Zone of 3. A radon zone of 3 predicts an average indoor radon screening level less than 2 pCi/L. The EPA recommends testing every home regardless of zone classification.
Radon FAQ for San Diego, CA
What is the average radon level in San Diego, CA?
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Most Active Radon Markets in California
Cities with the most user-submitted radon test data in the state.
| 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 |
| Woodland Hills | 7.67 pCi/L | 3 |
| South Lake Tahoe | 6.33 pCi/L | 3 |
| Palos Verdes Peninsula | 6.00 pCi/L | 3 |
| Bishop | 5.67 pCi/L | 3 |
| Sacramento | 4.33 pCi/L | 3 |
| Oakland | 3.33 pCi/L | 3 |
| Fresno | 10.00 pCi/L | 2 |
| Davis | 8.00 pCi/L | 2 |
| Palo Alto | 6.50 pCi/L | 2 |
| Studio City | 6.50 pCi/L | 2 |
| Menlo Park | 5.00 pCi/L | 2 |
| Truckee | 5.00 pCi/L | 2 |
| Walnut Creek | 4.00 pCi/L | 2 |
| San Diego | 3.50 pCi/L | 2 |
| San Francisco | 3.50 pCi/L | 2 |
| Belmont | 20.00 pCi/L | 1 |