Northridge, CA Radon Levels

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.

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

Northridge, CA Radon Facts

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

County Los Angeles County, CA

Zip Code 91324

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.

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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 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