Water Hardness in California Well Water

In California, water hardness levels average 88.26 mg/L CaCO3, with a maximum recorded level of 260.13 mg/L CaCO3. The EPA limit is 180 mg/L CaCO3. Currently 3.3% of tested wells exceed this limit, affecting approximately 39,600 wells.

Testing for water hardness in California typically costs around $37. If treatment is needed, water treatment systems for water hardness cost approximately $2,409.

The risk level for water hardness in California is rated as low. The state average of 88.26 mg/L CaCO3 is 36.1% below the national average of 138.229 mg/L CaCO3.