What is the minimum solids content required for water to be classified as mineral water?

Mineral water is defined by its natural mineral content, which plays a significant role in its classification as such. For water to be designated as mineral water, it must contain a minimum concentration of dissolved solids. The correct choice of 250 ppm (parts per million) reflects the established standard that indicates the presence of minerals integral to the water's unique properties and taste.

This minimum solids content ensures that the water has sufficient mineral concentrations that contribute to its flavor and potential health benefits, distinguishing it from regular tap water, which typically has a much lower dissolved solids content. Many regulatory bodies around the world, including those in the European Union and the United States, use this threshold to classify waters as mineral water.