Belmont, CA Radon Levels

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

Based on 1 user-submitted tests, the average radon level is 20.00 pCi/L.

Q: What EPA Radon Zone is Belmont in?

Belmont is in San Mateo County, EPA Zone 2.

Q: How much does radon mitigation cost in Belmont?

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

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

Belmont, CA Radon Facts

EPA Radon Zone Zone 2 — Moderate Risk 2–4 pCi/L (Zone 2)

County San Mateo County, CA

Zip Code 94002

Avg. User Level 20.00 pCi/L

User Tests 1

Perched in San Mateo County within the San Francisco Metro area, Belmont's hillside location features complex geology that can create pockets of elevated radon despite California's generally lower levels. Recent testing in zip code 94002 shows an average reading of 20.0 pCi/L, which significantly exceeds the EPA action level of 4.0 pCi/L. Homeowners should test their properties and consider mitigation systems, as the area's sloped terrain and varied foundation types can create unpredictable radon patterns.

20.00

pCi/L average

Above EPA Action Level

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

4.0 EPA

10+

Belmont, CA Radon Mitigation

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Belmont, CA Radon Levels

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

Radon Level	City	Home Age	Foundation
20 pCi/L	Belmont, CA	51-99 Years	Partial Basement

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Radon FAQ for Belmont, CA

What is the average radon level in Belmont, CA?

Based on 1 user-submitted test, the average radon level in Belmont is 20.00 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 Belmont in?

Belmont and the 94002 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 Belmont?

Radon mitigation in Belmont 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 Belmont?

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

Belmont, CA Radon Levels

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

Belmont, CA Radon Facts

Belmont, CA Radon Mitigation

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Belmont, CA Radon Levels

Radon FAQ for Belmont, CA

Most Active Radon Markets in California

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