Water School

Total dissolved solids, or TDS, are the amount of minerals that remain when a water sample is completely evaporated, such as the water spots on your glassware.  TDS is a measurement of all organic and sometimes inorganic solids in water and is reported as milligrams per liter (mg/l). TDS includes elements and organic compounds such as calcium, magnesium, potassium, sodium, bicarbonates, chlorides, and sulfates.  TDS is used as a general indicator of water quality.

Salinity or chloride concentration, refers to the amount of salt dissolved or contained in water. The higher the salinity, the less useful the water is for human consumption, agriculture and other uses.The Brazos River particularly in the upper part of the watershed, contains a high amount of salinity due to a naturally occurring underground salt deposits located northwest of Abilene.  As a result, surface water in some areas of the Brazos River must be treated to remove the amount of salt befor...