Radon Levels in Rancho Santa Fe, CA
Rancho Santa Fe is in San Diego County. Radon data is tracked at the county level by the EPA and CDC.
EPA predicts average indoor levels below 2 pCi/L in this county · Source: EPA, CDC
Tipper's take on radon in Rancho Santa Fe
Rancho Santa Fe is in San Diego County, EPA Zone 3, the lowest risk classification. The EPA predicts average indoor radon levels below 2 pCi/L here. CDC data from San Diego County puts the average measured radon level at 0.9 pCi/L.
Lower risk isn't no risk, though. Radon depends on your specific home's foundation, soil, and construction as much as county-level geology. Homes with basements or older foundations can test above 4 pCi/L even in Zone 3 areas.
Tipper's take: if you've never tested, a one-time check is cheap and quick. If you've already tested below 2 pCi/L, retest every two years or after any major renovation.
Sources: EPA Radon Zone Map, CDC Environmental Public Health Tracking
Test Your Home in Rancho Santa Fe
A short-term test kit costs about $15, includes the lab fee, and gives you a result in 48 hours. It's the only way to know your home's actual radon level.
Radon Professionals Near Rancho Santa Fe
Full County Data
Radon data is tracked at the county level. For state comparisons, nearby counties, and detailed analysis, see the full county page.
San Diego County, CA: Full Radon Data →Radon FAQ: Rancho Santa Fe, CA
What is the radon risk in Rancho Santa Fe?
Rancho Santa Fe is in San Diego County, which the EPA classifies as Zone 3 (Low risk). The county average is 0.9 pCi/L. The EPA recommends testing every home regardless of zone. Radon levels vary house to house.
How do I test my home in Rancho Santa Fe for radon?
Place a short-term radon test kit in the lowest livable level of your home for 48 hours under closed-house conditions. Kits cost about $15 and include the lab fee. Keep windows and exterior doors closed during the test (normal entry/exit is fine). Results come back in about a week.
What should I do if radon is high in my Rancho Santa Fe home?
If your test result is at or above 4 pCi/L, the EPA recommends installing a mitigation system. A certified contractor can install one for $800–$2,000 in most cases. The system runs continuously and typically brings levels well below 2 pCi/L. Retest after installation to confirm.