San Andreas, CA Radon Levels

Q: What EPA Radon Zone is San Andreas in?

San Andreas is in Calaveras County, EPA Zone 2.

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

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

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

San Andreas, CA Radon Facts

EPA Radon Zone Zone 2 — Moderate Risk 2–4 pCi/L (Zone 2)

County Calaveras County, CA

Zip Code 95249

Positioned in Calaveras County's Sierra Nevada foothills, San Andreas sits on metamorphic and volcanic geology that can create variable radon conditions depending on specific rock formations. The mountain community features diverse housing from historic Gold Rush-era structures to modern mountain homes, many with partial basements or crawl spaces. Testing data for zip codes 95249 and 95250 remains limited, making individual home testing essential for understanding radon levels in this geologically complex terrain.

San Andreas, 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 Andreas, CA

What EPA Radon Zone is San Andreas in?

San Andreas and the 95249 zip code are in Calaveras 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 San Andreas?

Radon mitigation in San Andreas 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 Andreas?

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