Menlo Park, CA Radon Mitigation and Testing

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

Based on 2 user-submitted tests, the average radon level is 5.00 pCi/L.

Q: What EPA Radon Zone is Menlo Park in?

Menlo Park is in San Mateo County, EPA Zone 2.

Q: How much does radon mitigation cost in Menlo Park?

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

Avg: 5.00 pCi/L

San Mateo County

EPA Zone 2

2 user tests

Menlo Park is located in San Mateo County, California. With 2 user-submitted readings averaging 5.00 pCi/L, the area exceeds the EPA's 4.0 pCi/L action threshold, and testing is strongly recommended for homeowners in the 94025 zip code.

5.00

pCi/L average

Above EPA Action Level

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

4.0 EPA

10+

Menlo Park, CA Radon Mitigation

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

Menlo Park, CA Radon Testing

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

Menlo Park, California Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
6 pCi/L	Menlo Park, CA	51-99 Years	No Basement/All Crawl Space	Feb 2026
4 pCi/L	Menlo Park, CA	21-50 Years	No Basement/All Crawl Space	Jul 2019

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

Menlo Park Radon Facts

Key details about the radon risk profile for Menlo Park and the 94025 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

San Mateo County, CA

Zip Code

94025

Predicted Screening Level

2–4 pCi/L (Zone 2)

Avg. User Submitted Level

5.00 pCi/L

User Tests Submitted

Menlo Park and the 94025 zip code are located in San Mateo 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 Menlo Park, CA

What is the average radon level in Menlo Park, CA?

Based on 2 user-submitted tests, the average radon level in Menlo Park is 5.00 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 Menlo Park in?

Menlo Park and the 94025 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 Menlo Park?

Radon mitigation in Menlo Park 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 Menlo Park?

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