Sebastopol, CA Radon Mitigation and Testing

Q: What EPA Radon Zone is Sebastopol in?

Sebastopol is in Sonoma County, EPA Zone 3.

Q: How much does radon mitigation cost in Sebastopol?

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

Sonoma County

EPA Zone 3

Set in the heart of Sonoma County's wine country, Sebastopol sits on alluvial soils and volcanic deposits that generally create moderate radon conditions. The community features a blend of historic Victorian homes and modern residences, with many properties in the 95472 area having crawl spaces or concrete slab foundations. While local testing data is currently limited, the region's geological makeup suggests homeowners should test for radon, especially in homes with enclosed foundation areas.

Sebastopol, CA Radon Mitigation

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

Sebastopol, CA Radon Testing

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

Sebastopol Radon Facts

Key details about the radon risk profile for Sebastopol and the 95472 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

Sonoma County, CA

Zip Code

95472

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Sebastopol and the 95472 zip code are located in Sonoma 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 Sebastopol, CA

What EPA Radon Zone is Sebastopol in?

Sebastopol and the 95472 zip code are in Sonoma 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 Sebastopol?

Radon mitigation in Sebastopol 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 Sebastopol?

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