O Neals, CA Radon Mitigation and Testing

Q: What EPA Radon Zone is O Neals in?

O Neals is in Madera County, EPA Zone 2.

Q: How much does radon mitigation cost in O Neals?

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

Madera County

EPA Zone 2

O Neals, CA resides in Madera 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. Testing is recommended for all homes in the 93645 zip code area.

O Neals, CA Radon Mitigation

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

O Neals, CA Radon Testing

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

O Neals Radon Facts

Key details about the radon risk profile for O Neals and the 93645 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Madera County, CA

Zip Code

93645

Predicted Screening Level

2–4 pCi/L (Zone 2)

O Neals and the 93645 zip code are located in Madera 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 O Neals, CA

What EPA Radon Zone is O Neals in?

O Neals and the 93645 zip code are in Madera 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 O Neals?

Radon mitigation in O Neals 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 O Neals?

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