How is TDS Measured in Water? You may wonder How is TDS measured in water and why knowing that matters for health and peace of mind. TDS stands for Total Dissolved Solids and it gives a quick snapshot of all dissolved substances such as calcium, magnesium and sodium in your water. Visit the link and know about the tds measured in water: https://www.netsolwater.com/how-is-tds-measured-in-water.php?blog=7064