Sonora, CA Radon Mitigation and Testing

Q: What EPA Radon Zone is Sonora in?

Sonora is in Tuolumne County, EPA Zone 2.

Q: How much does radon mitigation cost in Sonora?

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

Tuolumne County

EPA Zone 2

Mountain community Sonora in Tuolumne County sits in California's Gold Country where granitic bedrock and historic mining activities can create variable radon conditions. Testing data for this Sierra Nevada foothills town is currently limited, making individual home testing advisable for residents. The area's mix of older homes and varied geological conditions warrants careful attention to radon levels, particularly in properties with basements or crawl spaces.

Sonora, CA Radon Mitigation

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

Sonora, CA Radon Testing

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

Sonora Radon Facts

Key details about the radon risk profile for Sonora and the 95370 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Tuolumne County, CA

Zip Code

95370

Predicted Screening Level

2–4 pCi/L (Zone 2)

Sonora and the 95370 zip code are located in Tuolumne County, which has an EPA assigned Radon Zone of 2. A radon zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Sonora, CA

What EPA Radon Zone is Sonora in?

Sonora and the 95370 zip code are in Tuolumne 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 Sonora?

Radon mitigation in Sonora 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 Sonora?

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