evidence: Acidic water refers to water with a pH of less than 7 (1). [...] While acidic groundwater hasn’t been studied specifically, beverages with a pH of 4.5 or less have been shown to increase the risk of tooth decay. As such, regularly drinking acidic water may slowly erode your tooth enamel, causing cavities ( [...] However, drinking acidic water is not recommended, as it may lead to heavy metal poisoning and toxicity with repeated exposure. Additionally, its high acidity may corrode your teeth and the pipes in your home.