Two cases of taste and odor episodes in raw and groundwater in the Barcelona (NE Spain) metropolitan area are described. The first was caused by creosote, a distill of coal tar, dumped into river water by two wood-preserving factories. The second taste and odor episode was caused by the presence of a potent odorous compound, the 2-ethyl-5,5-dimethyl-1,3-dioxane, in different groundwater samples. This compound is a by-product present in wastes from resin manufacturing plants that use neopentyl glycol as a raw material for acid-catalysed condensations.

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