San Anselmo, CA Radon Mitigation and Testing

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.

Marin County

EPA Zone 3

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.

San Anselmo, CA Radon Testing

Finding qualified radon testing professionals is the first step toward protecting your home.

San Anselmo Radon Facts

Key details about the radon risk profile for San Anselmo and the 94960 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

Marin County, CA

Zip Code

94960

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

San Anselmo and the 94960 zip code are located in Marin County, which has an EPA assigned Radon Zone of 3. A radon zone of 3 predicts an average indoor radon screening level less than 2 pCi/L. The EPA recommends testing every home regardless of zone classification.

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 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