Sylmar, CA Radon Mitigation and Testing

Q: What EPA Radon Zone is Sylmar in?

Sylmar is in Los Angeles County, EPA Zone 2.

Q: How much does radon mitigation cost in Sylmar?

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

Los Angeles County

EPA Zone 2

Part of Los Angeles Metro in Los Angeles County, Sylmar sits in the San Fernando Valley where Mediterranean climate and sedimentary geology generally result in lower radon potential. Testing data for zip code 91342 is currently unavailable, but California's overall lower radon risk makes this community relatively favorable. The area's predominantly slab-on-grade construction and warm, dry conditions create less opportunity for radon accumulation compared to regions with basements and higher moisture levels.

Sylmar, CA Radon Mitigation

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

Sylmar, CA Radon Testing

Finding qualified radon testing professionals is the first step toward protecting your home.

Sylmar Radon Facts

Key details about the radon risk profile for Sylmar and the 91342 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Los Angeles County, CA

Zip Code

91342

Predicted Screening Level

2–4 pCi/L (Zone 2)

Sylmar and the 91342 zip code are located in Los Angeles County, which has an EPA assigned Radon Zone of 2. A radon zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Sylmar, CA

What EPA Radon Zone is Sylmar in?

Sylmar and the 91342 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 Sylmar?

Radon mitigation in Sylmar 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 Sylmar?

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 with the most user-submitted radon test data in the state.

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
Woodland Hills	7.67 pCi/L	3
South Lake Tahoe	6.33 pCi/L	3
Palos Verdes Peninsula	6.00 pCi/L	3
Bishop	5.67 pCi/L	3
Sacramento	4.33 pCi/L	3
Oakland	3.33 pCi/L	3
Fresno	10.00 pCi/L	2
Davis	8.00 pCi/L	2
Palo Alto	6.50 pCi/L	2
Studio City	6.50 pCi/L	2
Menlo Park	5.00 pCi/L	2
Truckee	5.00 pCi/L	2
Walnut Creek	4.00 pCi/L	2
San Diego	3.50 pCi/L	2
San Francisco	3.50 pCi/L	2
Belmont	20.00 pCi/L	1