Water School

What are total dissolved solids?

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.




The information provided on this site is intended as background on water within the Brazos River basin. There should be no expectation that this information is all encompassing, complete or in any way examines every aspect of this very complex natural resource.

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