Wilmington, CA Radon Mitigation and Testing

Q: What EPA Radon Zone is Wilmington in?

Wilmington is in Los Angeles County, EPA Zone 2.

Q: How much does radon mitigation cost in Wilmington?

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

Located within Los Angeles County in the expansive Los Angeles metro region, Wilmington sits on coastal plain sediments that typically result in lower radon concentrations throughout zip code 90744. While radon testing data for this area remains limited, the region's marine sedimentary geology and predominant slab-on-grade construction generally produce minimal radon accumulation. However, residents should still consider baseline testing as part of comprehensive home safety protocols.

Wilmington, CA Radon Mitigation

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

Wilmington, CA Radon Testing

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

Wilmington Radon Facts

Key details about the radon risk profile for Wilmington and the 90744 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Los Angeles County, CA

Zip Code

90744

Predicted Screening Level

2–4 pCi/L (Zone 2)

Wilmington and the 90744 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 Wilmington, CA

What EPA Radon Zone is Wilmington in?

Wilmington and the 90744 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 Wilmington?

Radon mitigation in Wilmington 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 Wilmington?

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