Odour and taste threshold in waterPhenol and especially most of its reaction products with chlorine (2- and 4-chlorophenol,2,4- and 2,6-dichlorophenol, 2,4,6-trichlorophenol) have an unpleasant taste and odour. Theoccurrence of phenol in drinking water is unacceptable, if the substance or one of the reactionproducts after drinking water chlorination can be detected by taste and odour.