Purified drinking water is water that has been filtered or processed to remove impurities like chemicals and other contaminants. It is usually produced using groundwater or tap water. Through purification, many types of impurities are removed, including bacteria, algae, fungi, parasites, metals like copper and lead, and chemical pollutants. Several methods are used to purify water commercially and in the home, including filtration, reverse osmosis, distillation, and deionization. Purified water is of significantly higher purity than spring water, tap water, or filtered water. In most developed countries, tap water is purified to ensure it’s safe for consumption. While most sources of public drinking water are closely regulated and safe to drink, many prefer to drink purified water.