Folsom, CA Radon Levels

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

Based on 1 user-submitted tests, the average radon level is 3.00 pCi/L.

Q: What EPA Radon Zone is Folsom in?

Folsom is in Sacramento County, EPA Zone 3.

Q: How much does radon mitigation cost in Folsom?

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

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

Folsom, CA Radon Facts

EPA Radon Zone Zone 3 — Low Risk < 2.0 pCi/L (Zone 3)

County Sacramento County, CA

Zip Code 95630

Avg. User Level 3.00 pCi/L

User Tests 1

Folsom in Sacramento County shows an average radon level of 3.0 pCi/L, which falls within the EPA's recommended range but still warrants continued monitoring and testing. This Sacramento Metro community sits within California's Central Valley, where granitic bedrock from the nearby Sierra Nevada foothills can create variable radon conditions. The area's mix of older ranch-style homes and newer subdivisions creates diverse foundation types that can affect radon entry patterns.

3.00

pCi/L average

Below EPA Action Level

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

4.0 EPA

10+

Folsom, CA Radon Mitigation

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

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Folsom, California Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
3 pCi/L	Folsom, CA	21-50 Years	No Basement/All Crawl Space	Aug 2025

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

Radon FAQ for Folsom, CA

What is the average radon level in Folsom, CA?

Based on 1 user-submitted test, the average radon level in Folsom is 3.00 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 Folsom in?

Folsom and the 95630 zip code are in Sacramento County, which has an EPA assigned Radon Zone of 3. A zone of 3 predicts an average indoor radon screening level less than 2 pCi/L.

How much does radon mitigation cost in Folsom?

Radon mitigation in Folsom 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 Folsom?

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