Water can be classified by the level of total dissolved solids (TDS) in the water:
*Fresh water: TDS is less than 1,000 ppm
*Brackish water: TDS = 1,000 to 10,000 ppm
*Saline water: TDS = 10,000 to 35,000 ppm
*Hypersaline: TDS greater than 35,000 ppm
Drinking water generally has a TDS below 500 ppm.  Higher TDS Fresh Water is drinkable but taste may be objectionable.