Santa Rosa, CA Radon Levels

Q: What EPA Radon Zone is Santa Rosa in?

Santa Rosa is in Sonoma County, EPA Zone 3.

Q: How much does radon mitigation cost in Santa Rosa?

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

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

Santa Rosa, CA Radon Facts

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

County Sonoma County, CA

Zip Code 95401

As the largest city in Sonoma County, Santa Rosa spans multiple zip codes (95401-95409) in EPA Zone 3, indicating moderate radon potential from the area's volcanic and sedimentary bedrock. The region's diverse geology, ranging from valley floor alluvium to foothill volcanic soils, can create variable radon conditions across neighborhoods. While comprehensive testing data remains limited, residents should test their homes given the moderate radon classification and the area's mix of slab-on-grade and basement foundations typical of Northern California construction.

Santa Rosa, 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 Santa Rosa, CA

What EPA Radon Zone is Santa Rosa in?

Santa Rosa and the 95401 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 Santa Rosa?

Radon mitigation in Santa Rosa 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 Rosa?

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