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      San Diego, CA Radon Levels

      Check local San Diego radon levels and find certified testing and mitigation professionals to keep your home safe

      San Diego, CA Radon Facts

      EPA Radon Zone Zone 3 — Low Risk < 2.0 pCi/L (Zone 3)
      County San Diego County, CA
      Zip Code 92101
      Avg. User Level 3.50 pCi/L
      User Tests 2

      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.

      3.50
      pCi/L average
      Below EPA Action Level

      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.

      0
      4.0 EPA
      10+

      San Diego, CA Radon Mitigation

      Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.

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      San Diego, CA Radon Levels

      User-submitted radon test readings from homes in the San Diego area.

      Radon LevelCityHome AgeFoundation
      4 pCi/L San Diego, CA 51-99 Years No Basement/All Slab
      3 pCi/L San Diego, CA 0-20 Years Partial Basement

      Have a radon test result for San Diego? Submit your reading to help other homeowners.

      Radon FAQ for San Diego, CA

      What is the average radon level in San Diego, CA?
      Based on 2 user-submitted tests, the average radon level in San Diego is 3.50 pCi/L. This is below the EPA's recommended action level of 4.0 pCi/L. However, we recommend all homes be tested regardless of your neighbor's results.
      What EPA Radon Zone is San Diego in?
      San Diego and the 92101 zip code are in San Diego County, which has an EPA assigned Radon Zone of 3. A zone of 3 predicts an average indoor radon screening level less than 2 pCi/L.
      How much does radon mitigation cost in San Diego?
      Radon mitigation in San Diego typically costs between $800 and $2,000. Most homes with standard basements can be mitigated with a sub-slab depressurization system in the $1,000–$1,500 range. Factors that can increase cost include complex foundations, crawl spaces, or very high radon levels.
      Should I test for radon if I'm buying a home in San Diego?
      Yes. Radon testing should be part of every home purchase. A short-term radon test is typically included as part of the home inspection process and costs $150–$250. If elevated levels are found, you can negotiate mitigation as part of the sale.

      Most Active Radon Markets in California

      Cities in California with the most user-submitted radon test data, ranked by number of submissions.

      CityAvg User Radon LevelSubmissions
      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

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      Free Radon Mitigation Quote

      Or call for a free quote: 1-800-299-3578

      A licensed contractor will contact you immediately.

      * Required