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      San Francisco, CA Radon Levels

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

      San Francisco, CA Radon Facts

      EPA Radon Zone Zone 2 — Moderate Risk 2–4 pCi/L (Zone 2)
      County San Francisco County, CA
      Zip Code 94101
      Avg. User Level 3.50 pCi/L
      User Tests 2

      Downtown San Francisco County shows radon levels averaging 3.5 pCi/L from recent testing, staying within EPA recommended ranges but varying significantly between individual properties. The city's unique position on the San Francisco Peninsula, with its complex geology of sedimentary rock and fill material, creates diverse radon conditions across different neighborhoods. High-rise residents and those in basement units should particularly consider testing, as building materials and construction methods can influence radon accumulation.

      3.50
      pCi/L average
      Below EPA Action Level

      Based on 2 user-submitted radon tests for homes in San Francisco, CA. The EPA recommends taking action at or above 4.0 pCi/L.

      0
      4.0 EPA
      10+

      San Francisco, 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 Francisco, CA Radon Levels

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

      Radon LevelCityHome AgeFoundation
      5 pCi/L San Francisco, CA 0-20 Years No Basement/All Slab
      2 pCi/L San Francisco, CA 21-50 Years —

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

      Radon FAQ for San Francisco, CA

      What is the average radon level in San Francisco, CA?
      Based on 2 user-submitted tests, the average radon level in San Francisco 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 Francisco in?
      San Francisco and the 94101 zip code are in San Francisco County, which has an EPA assigned Radon Zone of 2. A zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L.
      How much does radon mitigation cost in San Francisco?
      Radon mitigation in San Francisco 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 Francisco?
      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