Big Sur, CA Radon Levels
Check local Big Sur radon levels and find certified testing and mitigation professionals to keep your home safe
Big Sur, CA Radon Facts
EPA Radon Zone
Zone 2 — Moderate Risk
2–4 pCi/L (Zone 2)
County
Monterey County, CA
Zip Code
93920
Perched along the dramatic coastline of Monterey County, Big Sur sits on the granite and metamorphic rocks of the Santa Lucia Mountains. Testing data for the 93920 zip code is limited, but the crystalline bedrock and steep terrain can create localized radon hotspots despite California's generally lower radon potential. The area's unique mix of coastal homes and mountain retreats warrants individual testing regardless of foundation type.
Big Sur, 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 Big Sur?
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Radon FAQ for Big Sur, CA
What EPA Radon Zone is Big Sur in?
Big Sur and the 93920 zip code are in Monterey 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 Big Sur?
Radon mitigation in Big Sur 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 Big Sur?
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 |