Tannins are natural organic materials that are found in decaying vegetation. They fall into two large primary categories: humic acids and fulvic acids. Rain water passes through these organic materials, taking on on a weak-tea or amber color before ending up in wells and surface water supplies. Although this is a natural process, the presence of tannins in water supplies has increased over the years due to climate change. When humans burn fossil fuels, sulphur dioxide and nitrogen oxides are released into the atmosphere. These air pollutants mix with water and other materials before falling to the ground in the form of acid rain. Over time, acid rain alters the PH of the soil in falls on, removing minerals and nutrients. This damages vegetation, leading to an increase in tannins. What Are Tannins?
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