Radon in California Well Water

In California, radon levels average 36.553 pCi/L, with a maximum recorded level of 104.317 pCi/L. The EPA limit is 300 pCi/L. Currently 2.8% of tested wells exceed this limit, affecting approximately 33,600 wells.

Testing for radon in California typically costs around $30. If treatment is needed, water treatment systems for radon cost approximately $4,375.

The risk level for radon in California is rated as minimal. The state average of 36.553 pCi/L is 73.5% below the national average of 138.042 pCi/L.