California, KY Radon Levels

Q: What EPA Radon Zone is California in?

California is in Campbell 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.

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

California, KY Radon Facts

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

County Campbell County, KY

Zip Code 41007

Situated in Campbell County just across the Ohio River from Cincinnati, California sits on limestone and shale formations typical of northern Kentucky's geology. Testing data for this community in zip code 41007 remains insufficient, making individual home testing essential for assessing radon exposure within the Cincinnati metropolitan area. The proximity to the river valley and varied residential foundation types common to the region create diverse radon entry conditions.

5.00

pCi/L area average

Above EPA Action Level

Campbell County average: 5.00 pCi/L, based on 1 user-submitted test across 1 city in the county. No homeowner readings have been submitted for California itself yet, so this county figure is the closest available benchmark. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

California, KY Radon Mitigation

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

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Radon Readings Near California, KY

No homeowner tests have been submitted for California yet. The closest cities with user-submitted radon data are shown below — explore them to gauge local conditions. Radon varies by home, so testing is the only way to know your level.

City	Distance	Avg User Level	Readings
Alexandria	4.8 mi	5.00 pCi/L	1
Independence	12.6 mi	4.00 pCi/L	1
Florence	18.5 mi	5.40 pCi/L	5
Union	22.2 mi	4.67 pCi/L	3
Hebron	23.7 mi	4.50 pCi/L	2
Burlington	25.7 mi	6.50 pCi/L	2
Cynthiana	35.2 mi	5.00 pCi/L	1
Flemingsburg	46.6 mi	8.00 pCi/L	2

Campbell County Radon Profile

EPA mapping assigns Campbell County to Radon Zone 2, indicating moderate predicted indoor screening levels in the 2 to 4 pCi/L range based on regional geology. Homeowner-submitted tests from 1 city in Campbell County average 5.00 pCi/L across 1 test — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. As the second leading cause of lung cancer in the U.S., radon warrants testing in every Campbell County home regardless of zone or a neighbor's results.

Radon FAQ for California, KY

What EPA Radon Zone is California in?

California and the 41007 zip code are in Campbell 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.

Why are radon readings shown from areas near California?

No homeowner radon tests have been submitted for California yet. Because radon is driven by regional soil and bedrock geology, readings from the closest cities—and the Campbell County average—are the best available indicator of local conditions until California homeowners submit their own results. The EPA still recommends testing every individual home, since levels can vary significantly from house to house.

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.