San Bernardino, CA Radon Mitigation and Testing

Q: What EPA Radon Zone is San Bernardino in?

San Bernardino is in San Bernardino County, EPA Zone 2.

Q: How much does radon mitigation cost in San Bernardino?

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

San Bernardino County

EPA Zone 2

Positioned in San Bernardino County within the Riverside Metro area (zip code 92401), San Bernardino currently lacks comprehensive radon testing data. The city sits in an alluvial basin surrounded by mountains, with geological conditions that can vary significantly across neighborhoods depending on proximity to granite outcrops versus valley sediments. Individual home testing provides the most reliable assessment of radon exposure risk.

San Bernardino, CA Radon Mitigation

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

San Bernardino, CA Radon Testing

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

San Bernardino Radon Facts

Key details about the radon risk profile for San Bernardino and the 92401 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

San Bernardino County, CA

Zip Code

92401

Predicted Screening Level

2–4 pCi/L (Zone 2)

San Bernardino and the 92401 zip code are located in San Bernardino 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 San Bernardino, CA

What EPA Radon Zone is San Bernardino in?

San Bernardino and the 92401 zip code are in San Bernardino 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 San Bernardino?

Radon mitigation in San Bernardino 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 San Bernardino?

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