Cupertino, CA Radon Levels

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

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

Q: What EPA Radon Zone is Cupertino in?

Cupertino is in Santa Clara County, EPA Zone 2.

Q: How much does radon mitigation cost in Cupertino?

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

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

Cupertino, CA Radon Facts

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

County Santa Clara County, CA

Zip Code 95014

Avg. User Level 4.00 pCi/L

User Tests 1

Heart of Silicon Valley in Santa Clara County, Cupertino shows an average radon level of 4.0 pCi/L based on limited testing data. This reading meets the EPA's action threshold, reflecting the South Bay's complex geology of sedimentary rocks and alluvial soils. The city's predominantly post-1960s housing stock, featuring slab-on-grade construction typical of California, still warrants radon testing due to the area's geological variability.

4.00

pCi/L average

Above EPA Action Level

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

4.0 EPA

10+

Cupertino, CA Radon Mitigation

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

Need Radon Mitigation or Testing in Cupertino?

100% Free, No-Obligation Quotes
Matches You with State-Licensed Santa Clara County Pros

1-800-299-3578 Toll-free · Mon–Fri 8am–6pm ET

Cupertino, CA Radon Levels

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

Radon Level	City	Home Age	Foundation
4 pCi/L	Cupertino, CA	—	No Basement/All Slab

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

Radon FAQ for Cupertino, CA

What is the average radon level in Cupertino, CA?

Based on 1 user-submitted test, the average radon level in Cupertino 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 Cupertino in?

Cupertino and the 95014 zip code are in Santa Clara 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 Cupertino?

Radon mitigation in Cupertino 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 Cupertino?

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

Cupertino, CA Radon Levels

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

Cupertino, CA Radon Facts

Cupertino, CA Radon Mitigation

Need Radon Mitigation or Testing in Cupertino?

Cupertino, CA Radon Levels

Radon FAQ for Cupertino, CA

Most Active Radon Markets in California

Free Radon Mitigation Quote

Free Radon Mitigation Quote