San Mateo, CA Radon Levels
Check local San Mateo radon levels and find certified testing and mitigation professionals to keep your home safe
San Mateo, CA Radon Facts
EPA Radon Zone
Zone 2 — Moderate Risk
2–4 pCi/L (Zone 2)
County
San Mateo County, CA
Zip Code
94401
Located in San Mateo County on the San Francisco Peninsula between bay and hills, San Mateo sits atop bay mud and marine sedimentary formations. Testing data for zip code 94401 is currently unavailable to establish local radon exposure patterns. The city's diverse housing stock, ranging from mid-century tract developments to contemporary condominiums, presents varied foundation types where radon accumulation potential can differ significantly between individual properties.
San Mateo, 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 Mateo, CA
What EPA Radon Zone is San Mateo in?
San Mateo and the 94401 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 Mateo?
Radon mitigation in San Mateo 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 Mateo?
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 |