San Rafael, CA Radon Levels

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

Based on 1 user-submitted tests, the average radon level is 2.00 pCi/L.

Q: What EPA Radon Zone is San Rafael in?

San Rafael is in Marin County, EPA Zone 3.

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

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

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

San Rafael, CA Radon Facts

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

County Marin County, CA

Zip Code 94901

Avg. User Level 2.00 pCi/L

User Tests 1

Located in Marin County within the San Francisco Metro area, San Rafael sits on bay sediments and volcanic formations that generally produce low radon readings. Testing data for zip code 94901 remains sparse, making professional radon testing a prudent step for homeowners. The community's housing stock includes both historic downtown properties and hillside homes with diverse foundation types.

2.00

pCi/L average

Below EPA Action Level

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

4.0 EPA

10+

San Rafael, CA Radon Mitigation

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

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Radon FAQ for San Rafael, CA

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

Based on 1 user-submitted test, the average radon level in San Rafael is 2.00 pCi/L. This is below the EPA's recommended action level of 4.0 pCi/L. However, we recommend all homes be tested regardless of your neighbor's results.

What EPA Radon Zone is San Rafael in?

San Rafael and the 94901 zip code are in Marin 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 San Rafael?

Radon mitigation in San Rafael 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 Rafael?

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