Stonyford, CA Radon Mitigation and Testing

Q: What EPA Radon Zone is Stonyford in?

Stonyford is in Colusa County, EPA Zone 3.

Q: How much does radon mitigation cost in Stonyford?

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

Colusa County

EPA Zone 3

Located in Colusa County in Northern California's Coast Range foothills, Stonyford sits on sedimentary and volcanic rock formations typical of the region. With radon testing data sparse for zip code 95979, residents should prioritize individual home assessment. California's complex geology creates variable radon conditions, and even areas with generally lower potential can experience elevated readings in specific locations.

Stonyford, CA Radon Mitigation

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

Stonyford, CA Radon Testing

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

Stonyford Radon Facts

Key details about the radon risk profile for Stonyford and the 95979 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

Colusa County, CA

Zip Code

95979

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Stonyford and the 95979 zip code are located in Colusa 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 Stonyford, CA

What EPA Radon Zone is Stonyford in?

Stonyford and the 95979 zip code are in Colusa 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 Stonyford?

Radon mitigation in Stonyford 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 Stonyford?

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