Napa Valley: Where Do Total Dissolved Solids Come From?
You may often see the term “TDS” in terms of water contaminants and filter labels that claim to remove them. But what exactly are they? How do they affect you? And how can you deal with them?
Dissolved solids are defined as anything dissolved in water, including metals, salts and minerals. TDS can include inorganic salts and organic matter that have leached into the water. Most are harmless in nature, particularly in low concentrations. It’s unlikely that any water you drink has zero TDS. However, the EPA has set TDS as a contaminant of secondary standards, with a limit set at 500 mg/L.
Where Do TDS Come From?
Total dissolved solids can come from a number of sources, and the location of your home, climate, water treatment method, source, and a number of variables can contribute to the composition of your water. Common TDS contaminants can include ionic compounds derived from calcium, magnesium, potassium, sodium, chlorides, sulfates, phosphates and nitrates.
1. Industrial Wastewater and Sewage – treatment of both brings the biproduct of nitrates, which is important for animal growth. Algal blooms are prone to occur with the availability of nitrogen, causing an uptick in disinfectants being used by your municipality. This, in turn, leads to a more potent chlorine taste and smell. Phosphates can also be a non-point (water pollution from diffuse) source of total dissolved solids from wastewater treatment.
3. Piping/Hardware/Plumbing – the infrastructure of your own home could be the source of dissolved solids. [pullquote]Did you know water too LOW in TDS can actually have negative effects on your tap water?[/pullquote] Water in its purest form is a corrosive solvent, and can rake toxic materials such as lead and copper into your tap. This can be a major health risk. It’s a rare event the water source in your home is so low in total dissolved solids that it could become an issue, but if you are concerned about this, have your water tested today.
4. Sea Water – sea water, naturally, contains an excessive amount of NaCl (sodium) and other ionic compounds that contribute to a salty or brackish taste. While there are a handful of desalination plants (designed to remove sodium compounds from sea water), the hard truth is that purifying sea water takes an increased amount of energy and money to break such chemical bonds that most municipalities can not afford.
5. Agricultural/Farming/Irrigation Systems – just like in lawn treatment, synthetic farm fertilizers have nitrates that can dissolve into the soil. Elevated levels of nitrates also occur in animal waste and compost. Nitrogen is an essential nutrient for plant growth. But excess nitrogen can combine with organic materials on the surface to produce nitrates, which can be harmful to drinking water systems.
6. Naturally Occurring – When water makes its way through the ground, it encounters layers of limestone and chalk. These beds are comprised of calcium and magnesium bicarbonates. The bi-product of these dissolved solids is hard water. More than 85% of U.S. households have hard water, according to studies. Contact Culligan of Napa Valley today to learn more about how hard water could be affecting your home.
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