Castro Valley, CA Radon Mitigation and Testing
Located in Alameda County within the San Francisco Metro area, Castro Valley sits in the East Bay hills where complex geology creates variable radon conditions. Current testing shows an average of 4.0 pCi/L, exactly at the EPA action threshold. Both the 94546 and 94552 zip code areas should prioritize radon testing given the community's hillside location and diverse housing stock.
Based on 1 user-submitted radon test for homes in Castro Valley, CA. The EPA recommends taking action at or above 4.0 pCi/L.
Castro Valley, CA Radon Mitigation
Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.
Castro Valley, CA Radon Testing
Finding qualified radon testing professionals is the first step toward protecting your home.
Castro Valley, California Radon Levels
User-submitted radon test readings from homes in the Castro Valley area.
| Radon Level | City | Home Age | Foundation | Submitted |
|---|---|---|---|---|
| 4 pCi/L | Castro Valley, CA | 21-50 Years | No Basement/All Crawl Space | Jul 2018 |
Have a radon test result for Castro Valley? Submit your reading to help other homeowners.
Castro Valley Radon Facts
Key details about the radon risk profile for Castro Valley and the 94546 zip code area.
Castro Valley and the 94546 zip code are located in Alameda County, which has an EPA assigned Radon Zone of 2. A radon zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L. The EPA recommends testing every home regardless of zone classification.
Radon FAQ for Castro Valley, 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 |