The United States Environmental Protection Agency (EPA), which is responsible for drinking water regulations in the United States, includes TDS as a secondary standard, meaning that it is a voluntary guideline in the United States. In fact, many people buy mineral water, which has naturally elevated levels of dissolved solids. What Happens to the Water When the TDS Level is High?Īlone, a high concentration of dissolved solids is usually not a health hazard. Agricultural and urban runoff can carry excess minerals into water sources, as can wastewater discharges, industrial wastewater and salt that is used to de-ice roads. These minerals can also come from human activities. The water in the Prairie provinces tends to have high levels of dissolved solids, because of high amounts of calcium and magnesium in the ground. Mineral springs contain water with high levels of dissolved solids, because the water has flowed through a region where the rocks have a high salt content. These minerals can originate from a number of sources, both natural and as a result of human activities. How do These Solids End Up Dissolved in Water? Cations are positively charged ions and anions are negatively charged ions. Common inorganic salts that can be found in water include calcium, magnesium, potassium and sodium, which are all cations, and carbonates, nitrates, bicarbonates, chlorides and sulfates, which are all anions. TDS is made up of inorganic salts, as well as a small amount of organic matter. TDS stands for total dissolved solids, and represents the total concentration of dissolved substances in water.
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