San Anselmo, CA Radon Levels

Q: What EPA Radon Zone is San Anselmo in?

San Anselmo is in Marin County, EPA Zone 3.

Q: How much does radon mitigation cost in San Anselmo?

Radon mitigation typically costs between $800 and $2,000. Most standard systems fall in the $1,000-$1,500 range.

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

San Anselmo, CA Radon Facts

EPA Radon Zone Zone 3 — Low Risk < 2.0 pCi/L (Zone 3)

County Marin County, CA

Zip Code 94960

Tucked into Marin County's Ross Valley north of San Francisco, San Anselmo sits on alluvial deposits and Franciscan Complex geology that typically results in lower radon potential. The charming community features an eclectic mix of early 20th century Craftsman homes, mid-century ranch houses, and contemporary residences, many with partial basements or raised foundations. While radon testing data for zip code 94960 is limited, residents should consider testing given the varied geological conditions and diverse foundation types found throughout this Bay Area suburb.

San Anselmo, CA Radon Mitigation

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

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Radon FAQ for San Anselmo, CA

What EPA Radon Zone is San Anselmo in?

San Anselmo and the 94960 zip code are in Marin 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 Anselmo?

Radon mitigation in San Anselmo 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 Anselmo?

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.

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
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