Mercury in California Well Water

In California, mercury levels average 1.328 ppb, with a maximum recorded level of 3.964 ppb. The EPA limit is 2 ppb. Currently 5.5% of tested wells exceed this limit, affecting approximately 66,000 wells.

Testing for mercury in California typically costs around $99. If treatment is needed, water treatment systems for mercury cost approximately $2,854.

The risk level for mercury in California is rated as low. The state average of 1.328 ppb is 43.9% above the national average of 0.923 ppb.