Water quality is the nature of the water. Nature is defined by the composition of the water. They are physical, chemical and biological nature. In simple terms, water quality is the chemical and biological composition of the water. People understand water quality better by its suitability for a particular use, like for drinking water or domestic uses.

Suitability of water for any uses is measured by water quality parameters. In fact, the level of water quality for any use is defined the concentration of the required parameters. We also call it as Water Quality Standards.