What is permissible value for hardness in well water drinking purpose?

- Total Hardness: Should not exceed 200 mg/L (milligram per liter) as CaCO3.

_Excess hardness may cause scale formation in water heaters and pipes._

Additional guidelines for drinking water quality by World Health Organization (WHO):

- Total Hardness: It is recommended that total hardness in drinking water not exceed 500 mg/L (milligram per liter) as CaCO3. However, higher levels may be acceptable based on local circumstances and consumer acceptance.