Santa Clarita, CA Radon Levels

Q: What EPA Radon Zone is Santa Clarita in?

Santa Clarita is in Los Angeles County, EPA Zone 2.

Q: How much does radon mitigation cost in Santa Clarita?

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

Check local Santa Clarita radon levels and find certified testing and mitigation professionals to keep your home safe

Santa Clarita, CA Radon Facts

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

County Los Angeles County, CA

Zip Code 91350

Situated in the northern reaches of Los Angeles County, Santa Clarita's zip code 91350 area sits on sedimentary formations and alluvial deposits that characterize the Santa Clara River valley. While comprehensive radon testing data is currently limited, the region's mix of older ranch homes and newer suburban developments creates varied conditions for radon accumulation. Homeowners should prioritize testing, particularly in homes with basements, crawl spaces, or lower-level living areas common in hillside neighborhoods.

Santa Clarita, 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 Santa Clarita, CA

What EPA Radon Zone is Santa Clarita in?

Santa Clarita and the 91350 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 Santa Clarita?

Radon mitigation in Santa Clarita 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 Santa Clarita?

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