San Joaquin, CA Radon Levels

Q: What EPA Radon Zone is San Joaquin in?

San Joaquin is in Fresno County, EPA Zone 2.

Q: How much does radon mitigation cost in San Joaquin?

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

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

San Joaquin, CA Radon Facts

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

County Fresno County, CA

Zip Code 93660

Situated in the Central Valley portion of Fresno County, San Joaquin sits on deep agricultural soils formed from Sierra Nevada mountain runoff, typically characterized by low natural radon production due to the young alluvial deposits. The community features rural and semi-rural residential development with varied housing types including farmhouses, mobile homes, and newer single-family construction on larger lots. Testing data is presently limited in this agricultural area, so residents are encouraged to conduct radon testing to establish baseline levels given the varied soil depths and construction styles throughout the community.

San Joaquin, CA Radon Mitigation

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

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Radon FAQ for San Joaquin, CA

What EPA Radon Zone is San Joaquin in?

San Joaquin and the 93660 zip code are in Fresno 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 San Joaquin?

Radon mitigation in San Joaquin 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 San Joaquin?

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