What is meant by “water quality”?
Water quality is defined in terms of the biological, chemical, and physical content of the water. “Chemically pure” water, entirely free from any other materials, does not exist in nature.
Even distilled water contains naturally occurring substances – mostly bicarbonates, sulphates, sodium, chlorides, magnesium and potassium. Since water plays such a vital role in life on earth, good quality water is a precious resource. Often water quality is more important than water quantity. The quality of the water affects the use we make of it, but the reverse is also true. Once we have used the water, we affect its quality.