Palo Alto, CA Radon Mitigation and Testing

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.

Avg: 6.50 pCi/L

Santa Clara County

EPA Zone 2

2 user tests

Palo Alto is located in Santa Clara County, California. With 2 user-submitted readings averaging 6.50 pCi/L, the area exceeds the EPA's 4.0 pCi/L action threshold, and testing is strongly recommended for homeowners in the 94301 zip code.

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.

Palo Alto, CA Radon Testing

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

Palo Alto, California Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
4 pCi/L	Palo Alto, CA	51-99 Years	No Basement/All Crawl Space	Sep 2024
9 pCi/L	Palo Alto, CA	0-20 Years	Partial Basement	Dec 2023

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

Palo Alto Radon Facts

Key details about the radon risk profile for Palo Alto and the 94301 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Santa Clara County, CA

Zip Code

94301

Predicted Screening Level

2–4 pCi/L (Zone 2)

Avg. User Submitted Level

6.50 pCi/L

User Tests Submitted

Palo Alto and the 94301 zip code are located in Santa Clara 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 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 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