Sonora, CA Radon Levels

Q: What is the average radon level in Sonora, CA?

Based on 1 user-submitted tests, the average radon level is 4.00 pCi/L.

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.

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

Sonora, CA Radon Facts

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

County Tuolumne County, CA

Zip Code 95370

Avg. User Level 4.00 pCi/L

User Tests 1

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.

4.00

pCi/L average

Above EPA Action Level

Based on 1 user-submitted radon test for homes in Sonora, CA. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Sonora, CA Radon Mitigation

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Sonora, CA Radon Levels

User-submitted radon test readings from homes in the Sonora area.

Radon Level	City	Home Age	Foundation
4 pCi/L	Sonora, CA	21-50 Years	No Basement/All Crawl Space

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Radon FAQ for Sonora, CA

What is the average radon level in Sonora, CA?

Based on 1 user-submitted test, the average radon level in Sonora is 4.00 pCi/L. This exceeds the EPA's recommended action level of 4.0 pCi/L, and radon testing is recommended for all homes in the area.

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 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

Sonora, CA Radon Levels

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

Sonora, CA Radon Facts

Sonora, CA Radon Mitigation

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Sonora, CA Radon Levels

Radon FAQ for Sonora, CA

Most Active Radon Markets in California

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