As the name suggests, “acid water” occurs when water is acidic, meaning the water has a pH of less than 7. This can make the water unsafe to consume and can cause damage to your water system. Typically, water should have a pH balance of 7, which means it’s neither basic nor acidic. This water is safe to drink, cook with, and bathe in, among other activities. Acid water may refer to water that is naturally unbalanced toward the lower side of the pH scale.