San Carlos, CA Radon Mitigation and Testing

Q: What EPA Radon Zone is San Carlos in?

San Carlos is in San Mateo County, EPA Zone 2.

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

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

San Mateo County

EPA Zone 2

This San Mateo County community in the San Francisco Metro area (zip code 94070) currently has limited radon testing data available for analysis. Located on the San Francisco Peninsula with marine sedimentary geology and bay fill influences, the area generally experiences lower radon potential than inland granite regions. Nonetheless, homeowners should consider testing as individual properties may vary from regional geological patterns.

San Carlos, CA Radon Mitigation

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

San Carlos, CA Radon Testing

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

San Carlos Radon Facts

Key details about the radon risk profile for San Carlos and the 94070 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

San Mateo County, CA

Zip Code

94070

Predicted Screening Level

2–4 pCi/L (Zone 2)

San Carlos and the 94070 zip code are located in San Mateo 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 Carlos, CA

What EPA Radon Zone is San Carlos in?

San Carlos and the 94070 zip code are in San Mateo 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 Carlos?

Radon mitigation in San Carlos 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 Carlos?

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