Calistoga, CA Radon Mitigation and Testing

Q: What EPA Radon Zone is Calistoga in?

Calistoga is in Napa County, EPA Zone 3.

Q: How much does radon mitigation cost in Calistoga?

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

Napa County

EPA Zone 3

Nestled in Napa County at the northern end of the famous Napa Valley, Calistoga sits on volcanic soils and geothermal formations that can influence radon levels in this wine country community. While testing data for zip code 94515 remains limited, the area's geological complexity and geothermal activity warrant individual home testing. The combination of historic homes and newer construction throughout the valley creates varied foundation conditions that affect radon accumulation patterns.

Calistoga, CA Radon Mitigation

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

Calistoga, CA Radon Testing

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

Calistoga Radon Facts

Key details about the radon risk profile for Calistoga and the 94515 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

Napa County, CA

Zip Code

94515

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Calistoga and the 94515 zip code are located in Napa County, which has an EPA assigned Radon Zone of 3. A radon zone of 3 predicts an average indoor radon screening level less than 2 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Calistoga, CA

What EPA Radon Zone is Calistoga in?

Calistoga and the 94515 zip code are in Napa 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 Calistoga?

Radon mitigation in Calistoga 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 Calistoga?

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