Long Barn, CA Radon Mitigation and Testing

Q: What EPA Radon Zone is Long Barn in?

Long Barn is in Tuolumne County, EPA Zone 2.

Q: How much does radon mitigation cost in Long Barn?

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

Positioned in Tuolumne County in the Sierra Nevada foothills, Long Barn sits in mountainous terrain where granite bedrock can contribute to moderate radon levels through natural uranium content. The area's housing consists primarily of mountain cabins and rural homes, many built on pier or crawl space foundations. Since testing data for zip code 95335 is currently limited, residents should consider radon testing to determine their specific exposure risk in this elevated terrain.

Long Barn, CA Radon Mitigation

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

Long Barn, CA Radon Testing

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

Long Barn Radon Facts

Key details about the radon risk profile for Long Barn and the 95335 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Tuolumne County, CA

Zip Code

95335

Predicted Screening Level

2–4 pCi/L (Zone 2)

Long Barn and the 95335 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 Long Barn, CA

What EPA Radon Zone is Long Barn in?

Long Barn and the 95335 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 Long Barn?

Radon mitigation in Long Barn 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 Long Barn?

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