A recent cross-country survey of 1750 people in the United States examined public perception of chlorinous flavours in tap water and found that the majority of consumers were satisfied with their municipal tap water. However, taste was often the cause of higher consumer dissatisfaction, and the most common off-flavour reported in drinking water was "chlorinous" (15.5% for taste, 14.8% for odour) (AwwaRF, 2004). In this study, average threshold sensitivity to the taste of free chlorine was 0.82 mg/L, with 46% unable to detect free chlorine at the highest residual concentrations (~1 mg/L) in their household tap water.
Suffet et al. (1996) indicated that it is possible that chlorine odour problems are produced by other compounds and are not a result of the disinfection process. Although consumers may report a taste or odour problem as "chlorinous," it should be noted that they may be confusing chlorinous taste and odour with tastes and odours from CDBPs (AwwaRF, 2004). Thus, in many cases, it is difficult to accurately identify consumers' taste and odour problems based solely on their description of the tastes and odours.
Bookmarks