Nitrate in California Well Water

In California, nitrate levels average 3.594 mg/L, with a maximum recorded level of 10.713 mg/L. The EPA limit is 10 mg/L. Currently 12.4% of tested wells exceed this limit, affecting approximately 148,800 wells.

Testing for nitrate in California typically costs around $76. If treatment is needed, water treatment systems for nitrate cost approximately $4,519.

The risk level for nitrate in California is rated as moderate. The state average of 3.594 mg/L is 17.0% below the national average of 4.332 mg/L.