Out of all 23 target analytes, seven were quantifiable with standard addition in the laboratory municipal water supply sample used here for method performance assessment and are reported in Table . The highest concentrations were measured for two HAAs, bromodichloro-and chlorodibromoacetic acid, at 680 and 300 ng/L, respectively. These DBPs are cytotoxic, genotoxic, mutagenic and teratogenic .. The US Environmental Protection Agency and the EU set a maximum contaminant level (MCL) for five specific HAAs at 60 µg/L, but not including those HAA substances detected here. Acesulfame is an artificial sweetener and has been shown to survive treatment to result in drinking water concentrations at the ng-µg/L range (here, at 194 ng/L). Four perfluoroalkylsulfonic acids were also quantified at concentrations <5 ng/L, and more evidence is emerging showing their effects in humans.