California, MO Radon Mitigation and Testing

Q: What EPA Radon Zone is California in?

California is in Moniteau County, EPA Zone 2.

Q: How much does radon mitigation cost in California?

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

Moniteau County

EPA Zone 2

Found in Moniteau County in central Missouri near both Columbia and Jefferson City, California sits over limestone and dolomite bedrock characteristic of the Missouri River valley region. While testing data for zip code 65018 is currently limited, the geological conditions suggest potential for moderate radon levels that warrant individual home testing. The community's location between two metro areas provides access to radon services while maintaining its rural residential character.

California, MO Radon Mitigation

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

California, MO Radon Testing

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

California Radon Facts

Key details about the radon risk profile for California and the 65018 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Moniteau County, MO

Zip Code

65018

Predicted Screening Level

2–4 pCi/L (Zone 2)

California and the 65018 zip code are located in Moniteau 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 California, MO

What EPA Radon Zone is California in?

California and the 65018 zip code are in Moniteau 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 California?

Radon mitigation in California 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 California?

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 Missouri

Cities with the most user-submitted radon test data in the state.

City	Avg User Radon Level	Submissions
Troy	8.50 pCi/L	4
Lees Summit	7.00 pCi/L	3
Columbia	3.00 pCi/L	2
House Springs	7.00 pCi/L	1
Kansas City	7.00 pCi/L	1
Springfield	7.00 pCi/L	1
Independence	5.00 pCi/L	1
Wentzville	No submissions	0