Calimesa, CA Radon Mitigation and Testing

Q: What EPA Radon Zone is Calimesa in?

Calimesa is in Riverside County, EPA Zone 2.

Q: How much does radon mitigation cost in Calimesa?

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

Riverside County

EPA Zone 2

Located in Riverside County between the San Bernardino Mountains and Riverside metropolitan area, Calimesa sits on alluvial deposits and granite formations that can contribute to varying radon levels. With no current testing data for zip code 92320, residents should prioritize individual home testing to assess their radon exposure within this growing suburban community. The area's mix of established homes and newer development creates diverse foundation conditions affecting radon entry patterns.

Calimesa, CA Radon Mitigation

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

Calimesa, CA Radon Testing

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

Calimesa Radon Facts

Key details about the radon risk profile for Calimesa and the 92320 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Riverside County, CA

Zip Code

92320

Predicted Screening Level

2–4 pCi/L (Zone 2)

Calimesa and the 92320 zip code are located in Riverside 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 Calimesa, CA

What EPA Radon Zone is Calimesa in?

Calimesa and the 92320 zip code are in Riverside 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 Calimesa?

Radon mitigation in Calimesa 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 Calimesa?

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