Palo Alto, CA Radon Levels

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

Based on 2 user-submitted tests, the average radon level is 6.50 pCi/L.

Q: What EPA Radon Zone is Palo Alto in?

Palo Alto is in Santa Clara County, EPA Zone 2.

Q: How much does radon mitigation cost in Palo Alto?

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

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

Palo Alto, CA Radon Facts

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

County Santa Clara County, CA

Zip Code 94301

Avg. User Level 6.50 pCi/L

User Tests 2

Palo Alto's radon levels in Santa Clara County average 6.5 pCi/L based on available testing data, exceeding the EPA's 4.0 pCi/L action level. The city's Mediterranean climate and diverse housing stock, from mid-century ranch homes to modern developments, can both influence radon accumulation patterns. Residents across all zip codes (94301, 94303, 94304, 94306) should test their homes, as radon can vary significantly even within neighborhoods.

6.50

pCi/L average

Above EPA Action Level

Based on 2 user-submitted radon tests for homes in Palo Alto, CA. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Palo Alto, 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 Palo Alto?

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

Palo Alto, CA Radon Levels

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

Radon Level	City	Home Age	Foundation
4 pCi/L	Palo Alto, CA	51-99 Years	No Basement/All Crawl Space
9 pCi/L	Palo Alto, CA	0-20 Years	Partial Basement

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

Radon FAQ for Palo Alto, CA

What is the average radon level in Palo Alto, CA?

Based on 2 user-submitted tests, the average radon level in Palo Alto is 6.50 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 Palo Alto in?

Palo Alto and the 94301 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 Palo Alto?

Radon mitigation in Palo Alto 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 Palo Alto?

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

Palo Alto, CA Radon Levels

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

Palo Alto, CA Radon Facts

Palo Alto, CA Radon Mitigation

Need Radon Mitigation or Testing in Palo Alto?

Palo Alto, CA Radon Levels

Radon FAQ for Palo Alto, CA

Most Active Radon Markets in California

Free Radon Mitigation Quote

Free Radon Mitigation Quote