Simi Valley, CA Radon Mitigation and Testing

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

Based on 1 user-submitted tests, the average radon level is 7.00 pCi/L.

Q: What EPA Radon Zone is Simi Valley in?

Simi Valley is in Ventura County, EPA Zone 1.

Q: How much does radon mitigation cost in Simi Valley?

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

Avg: 7.00 pCi/L

Ventura County

EPA Zone 1

1 user test

Simi Valley in Ventura County sits within the Oxnard Metro area, where local testing reveals an average radon level of 7.0 pCi/L for zip code 93063. This reading significantly exceeds EPA action levels, reflecting the area's unique geology of sedimentary formations and valley topography. Homeowners in this suburban community should prioritize professional radon mitigation given these elevated readings.

7.00

pCi/L average

Above EPA Action Level

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

4.0 EPA

10+

Simi Valley, CA Radon Mitigation

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

Simi Valley, CA Radon Testing

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

Simi Valley, California Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
7 pCi/L	Simi Valley, CA	21-50 Years	No Basement/All Slab	Jan 2022

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

Simi Valley Radon Facts

Key details about the radon risk profile for Simi Valley and the 93063 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Ventura County, CA

Zip Code

93063

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Avg. User Submitted Level

7.00 pCi/L

User Tests Submitted

Simi Valley and the 93063 zip code are located in Ventura County, which has an EPA assigned Radon Zone of 1. A radon zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Simi Valley, CA

What is the average radon level in Simi Valley, CA?

Based on 1 user-submitted test, the average radon level in Simi Valley is 7.00 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 Simi Valley in?

Simi Valley and the 93063 zip code are in Ventura County, which has an EPA assigned Radon Zone of 1. A zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L.

How much does radon mitigation cost in Simi Valley?

Radon mitigation in Simi Valley 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 Simi Valley?

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