Walnut Creek, CA Radon Mitigation and Testing

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

Based on 3 user-submitted tests, the average radon level is 3.70 pCi/L.

Q: What EPA Radon Zone is Walnut Creek in?

Walnut Creek is in Contra Costa County, EPA Zone 2.

Q: How much does radon mitigation cost in Walnut Creek?

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

Avg: 3.70 pCi/L

Contra Costa County

EPA Zone 2

3 user tests

Walnut Creek is located in Contra Costa County, California. With 3 user-submitted readings averaging 3.70 pCi/L, levels are currently below the EPA's recommended action level of 4.0 pCi/L. However, we recommend all homes be tested regardless of your neighbor's results.

3.70

pCi/L average

Below EPA Action Level

Based on 3 user-submitted radon tests for homes in Walnut Creek, CA. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Walnut Creek, CA Radon Mitigation

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

Walnut Creek, CA Radon Testing

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

Walnut Creek, California Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
4 pCi/L	Walnut Creek, CA	51-99 Years	No Basement/All Crawl Space	Dec 2020

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

Walnut Creek Radon Facts

Key details about the radon risk profile for Walnut Creek and the 94595 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Contra Costa County, CA

Zip Code

94595

Predicted Screening Level

2–4 pCi/L (Zone 2)

Avg. User Submitted Level

3.70 pCi/L

User Tests Submitted

Walnut Creek and the 94595 zip code are located in Contra Costa 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 Walnut Creek, CA

What is the average radon level in Walnut Creek, CA?

Based on 3 user-submitted tests, the average radon level in Walnut Creek is 3.70 pCi/L. This is below the EPA's recommended action level of 4.0 pCi/L. However, we recommend all homes be tested regardless of your neighbor's results.

What EPA Radon Zone is Walnut Creek in?

Walnut Creek and the 94595 zip code are in Contra Costa 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 Walnut Creek?

Radon mitigation in Walnut Creek 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 Walnut Creek?

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