Water Hardness in Hawaii Well Water

In Hawaii, water hardness levels average 177.54 mg/L CaCO3, with a maximum recorded level of 475.83 mg/L CaCO3. The EPA limit is 180 mg/L CaCO3. Currently 11.7% of tested wells exceed this limit, affecting approximately 14,040 wells.

Testing for water hardness in Hawaii typically costs around $148. If treatment is needed, water treatment systems for water hardness cost approximately $3,332.

The risk level for water hardness in Hawaii is rated as moderate. The state average of 177.54 mg/L CaCO3 is 28.4% above the national average of 138.229 mg/L CaCO3.