The pH of pure water is 7, which is considered neutral. The pH scale ranges from 0 to 14, with 7 being neutral, values below 7 being acidic, and values above 7 being basic or alkaline. The pH of water can vary depending on several factors, including the weather, but tap water typically has a pH of about 7.5. It is important to note that the pH of water alone does not provide a full picture of the characteristics or limitations of the water supply.