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      Santa Monica, CA Radon Levels

      Check local Santa Monica radon levels and find certified testing and mitigation professionals to keep your home safe

      Santa Monica, CA Radon Facts

      EPA Radon Zone Zone 2 — Moderate Risk 2–4 pCi/L (Zone 2)
      County Los Angeles County, CA
      Zip Code 90401
      Avg. User Level 5.00 pCi/L
      User Tests 1

      This iconic beachside city in Los Angeles County has recorded an average radon level of 5.0 pCi/L across zip codes 90401-90405, which exceeds the EPA action level of 4.0 pCi/L. Despite Santa Monica's coastal location in EPA Zone 2, the underlying marine terrace deposits and urban housing density can create pockets of elevated radon concentration. Residents should prioritize testing, especially in multi-story buildings and homes with basements or enclosed lower levels where radon accumulation is most likely.

      5.00
      pCi/L average
      Above EPA Action Level

      Based on 1 user-submitted radon test for homes in Santa Monica, CA. The EPA recommends taking action at or above 4.0 pCi/L.

      0
      4.0 EPA
      10+

      Santa Monica, CA Radon Mitigation

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

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      Santa Monica, CA Radon Levels

      User-submitted radon test readings from homes in the Santa Monica area.

      Radon LevelCityHome AgeFoundation
      5 pCi/L Santa Monica, CA 51-99 Years No Basement/All Crawl Space

      Have a radon test result for Santa Monica? Submit your reading to help other homeowners.

      Radon FAQ for Santa Monica, CA

      What is the average radon level in Santa Monica, CA?
      Based on 1 user-submitted test, the average radon level in Santa Monica is 5.00 pCi/L. This exceeds the EPA's recommended action level of 4.0 pCi/L, and radon testing is recommended for all homes in the area.
      What EPA Radon Zone is Santa Monica in?
      Santa Monica and the 90401 zip code are in Los Angeles 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 Santa Monica?
      Radon mitigation in Santa Monica 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 Santa Monica?
      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