San Leandro, CA Radon Mitigation and Testing

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

Based on 1 user-submitted tests, the average radon level is 4.00 pCi/L.

Q: What EPA Radon Zone is San Leandro in?

San Leandro is in Alameda County, EPA Zone 2.

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

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

Avg: 4.00 pCi/L

Alameda County

EPA Zone 2

1 user test

San Leandro is located in Alameda County, California. With 1 user-submitted readings averaging 4.00 pCi/L, the area exceeds the EPA's 4.0 pCi/L action threshold, and testing is strongly recommended for homeowners in the 94577 zip code.

4.00

pCi/L average

Above EPA Action Level

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

4.0 EPA

10+

San Leandro, CA Radon Mitigation

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

San Leandro, CA Radon Testing

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

San Leandro, California Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
4 pCi/L	San Leandro, CA	51-99 Years	No Basement/All Crawl Space	Nov 2025

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

San Leandro Radon Facts

Key details about the radon risk profile for San Leandro and the 94577 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Alameda County, CA

Zip Code

94577

Predicted Screening Level

2–4 pCi/L (Zone 2)

Avg. User Submitted Level

4.00 pCi/L

User Tests Submitted

San Leandro and the 94577 zip code are located in Alameda 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 Leandro, CA

What is the average radon level in San Leandro, CA?

Based on 1 user-submitted test, the average radon level in San Leandro is 4.00 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 San Leandro in?

San Leandro and the 94577 zip code are in Alameda 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 Leandro?

Radon mitigation in San Leandro 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 Leandro?

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