O Neals, CA Radon Levels
Check local O Neals radon levels and find certified testing and mitigation professionals to keep your home safe
O Neals, CA Radon Facts
EPA Radon Zone
Zone 2 — Moderate Risk
2–4 pCi/L (Zone 2)
County
Madera County, CA
Zip Code
93645
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.
Need Radon Mitigation or Testing in O Neals?
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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 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 |