San Gabriel, CA Radon Levels

Q: What EPA Radon Zone is San Gabriel in?

San Gabriel is in Los Angeles County, EPA Zone 2.

Q: How much does radon mitigation cost in San Gabriel?

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

Check local San Gabriel radon levels and find certified testing and mitigation professionals to keep your home safe

San Gabriel, CA Radon Facts

EPA Radon Zone Zone 2 — Moderate Risk 2–4 pCi/L (Zone 2)

County Los Angeles County, CA

Zip Code 91775

Situated in the San Gabriel Valley portion of Los Angeles County, this community sits on alluvial fan deposits from the nearby San Gabriel Mountains, creating generally stable soil conditions with low natural radon potential. The area features predominantly single-family residential development from the mid-20th century forward, with many homes built on concrete slab foundations typical of Southern California construction. While comprehensive radon testing data is currently limited, the geological conditions suggest individual home testing can provide valuable baseline information for residents.

San Gabriel, CA Radon Mitigation

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

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Radon FAQ for San Gabriel, CA

What EPA Radon Zone is San Gabriel in?

San Gabriel and the 91775 zip code are in Los Angeles 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 San Gabriel?

Radon mitigation in San Gabriel 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 San Gabriel?

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