The ideal pH level of drinking water is between 6 and 8.5. The pH value of water is used to determine whether water is hard or soft. Pure water has a pH of 7, and water lower than 7 pH is considered acidic.
Acidic water sometimes contains metal ions such as manganese, copper, lead and iron. Acidic water causes damage to metal piping and has a sour taste. A neutralizer is typically used to treat a low-pH water system. Water with a pH above 8.5 is considered hard water and typically has a bitter taste. Hard water typically does not pose any health risks.