Northridge, CA Radon Mitigation and Testing

Q: What EPA Radon Zone is Northridge in?

Northridge is in Los Angeles County, EPA Zone 2.

Q: How much does radon mitigation cost in Northridge?

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

Northridge spans zip codes 91324 and 91325 in Los Angeles County, situated in the San Fernando Valley where alluvial deposits over sedimentary bedrock typically produce lower radon levels than California's granite regions. Testing data for this Los Angeles metro area community remains limited, making individual home radon measurements valuable for establishing local patterns. While Southern California's geology generally correlates with lower radon potential, residents should still test to ensure their homes meet EPA safety guidelines, particularly given the area's characteristic slab-on-grade construction.

Northridge, CA Radon Mitigation

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

Northridge, CA Radon Testing

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

Northridge Radon Facts

Key details about the radon risk profile for Northridge and the 91324 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Los Angeles County, CA

Zip Code

91324

Predicted Screening Level

2–4 pCi/L (Zone 2)

Northridge and the 91324 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 Northridge, CA

What EPA Radon Zone is Northridge in?

Northridge and the 91324 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 Northridge?

Radon mitigation in Northridge 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 Northridge?

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