Orange, CA Radon Levels

Q: What is the average radon level in Orange, CA?

Based on 1 user-submitted tests, the average radon level is 5.00 pCi/L.

Q: What EPA Radon Zone is Orange in?

Orange is in Orange County, EPA Zone 3.

Q: How much does radon mitigation cost in Orange?

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

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

Orange, CA Radon Facts

EPA Radon Zone Zone 3 — Low Risk < 2.0 pCi/L (Zone 3)

County Orange County, CA

Zip Code 92862

Avg. User Level 5.00 pCi/L

User Tests 1

Located in Orange County within the Los Angeles Metro area, Orange has recorded an average radon level of 5.0 pCi/L based on initial testing data from multiple zip codes including 92862, 92865, and others. This reading exceeds the EPA action level of 4.0 pCi/L, indicating that mitigation systems should be considered for affected properties. The area's diverse housing stock, ranging from mid-century ranch homes to newer developments, combined with underlying sedimentary geology, can create varying radon entry conditions across different neighborhoods.

5.00

pCi/L average

Above EPA Action Level

Based on 1 user-submitted radon test for homes in Orange, CA. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Orange, CA Radon Mitigation

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Orange, CA Radon Levels

User-submitted radon test readings from homes in the Orange area.

Radon Level	City	Home Age	Foundation
5 pCi/L	Orange, CA	21-50 Years	No Basement/All Slab

Have a radon test result for Orange? Submit your reading to help other homeowners.

Radon FAQ for Orange, CA

What is the average radon level in Orange, CA?

Based on 1 user-submitted test, the average radon level in Orange is 5.00 pCi/L. This exceeds the EPA's recommended action level of 4.0 pCi/L, and radon testing is recommended for all homes in the area.

What EPA Radon Zone is Orange in?

Orange and the 92862 zip code are in Orange County, which has an EPA assigned Radon Zone of 3. A zone of 3 predicts an average indoor radon screening level less than 2 pCi/L.

How much does radon mitigation cost in Orange?

Radon mitigation in Orange 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 Orange?

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

Orange, CA Radon Levels

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

Orange, CA Radon Facts

Orange, CA Radon Mitigation

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Orange, CA Radon Levels

Radon FAQ for Orange, CA

Most Active Radon Markets in California

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