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

Positioned in the Sierra Nevada foothills within Madera County, O'Neals benefits from California's generally lower radon potential, though mountainous terrain can create localized variations. Testing data for zip code 93645 remains limited in this rural community near the Fresno Metro area. While California typically experiences lower radon levels than many states, homeowners should still consider testing, particularly in properties with unique geological settings or enclosed foundation spaces.

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