The purpose of this project was to examine the water quality of the pre-chosen 362 drinking water systems and 38 simple tap-water systems of the 22 municipal counties or cities. There were 73 analytes for drinking water systems, with 47 of them regulated and the remaining 26 non-regulated. The regulated analytes included 13 metals (arsenic, lead, selenium, chromium, cadmium, barium, antimony, nickel, mercury, silver, indium, molybdenum and aluminum), 1 health affecting substance (cyanide), 4 disinfection byproducts (total trihalomethanes (TTHMs), bromate, chlorite and haloacetic acids (HAA5) ), 15 volatile organics (trichoroethylene, carbon tetrachloride, 1,1,1-trichloroethane, 1,2-dichloroethane, vinyl chloride, benzene, 1,4-dichlorobenzene, 1,1-dichloroethene, dichloromethane, 1,2-dichlorobenzene, xylenes, cis- and trans- 1,2-dichloroethene, tetrachloroethene and toluene), 13 pesticides (endosulfan, lindane, butachlor, 2,4-D, paraquat, methomyl, carbofuran, Isoprocarb, methamidophos, diazinon, parathion, EPN, and monocrotophos) and 1 persistent volatile organic compound (dioxins), which accounted for a total of 47 analytes. 　　The non-regulated analytes included 3 metals (hexavalent chromium, gallium, thallium), 1 formaldehyde, 6 volatile organics (1,1-dichloroethane, 1,2-dichloro propane, styrene, chlorobenzene, ethylbenzene, and MTBE), 2 semi-Volatile organic compounds (hexachlorobenzene, and hexachloro-cyclopentadiene), 3 pesticides (fenthion, thiophanate-methyl, and glufosinate-ammonium), 8 endocrine disrupting chemicals (nonyl phenols, bisphenol A, dimethyl phthalate (DMP), diethyl phthalate (DEP), di-n-butyl phthalate (DBP), nenzyl butyl phthalate (BBP), di-n-octyl phthalate (DNOP), bis(2-ethylhexyl) phthalate (DEHP)), 2 microorganisms (fecal coliforms, E. coli) and 1 biological metabolite (microcystin-LR), which accounted for a total of 24 analytes. 　　The total test counts of the regulated analytes and non-regulated analytes for tap-water systems were 6,460 and 889, and the total test counts of the regulated and non-regulated analytes for simple tapwater systems were 785 and 69, respectively. Water examined for all tested locations met the required drinking water criteria, which had a passing rate of 98.9% and 99.9%. All analytes tested met the required drinking water criteria, which had a passing rate all of 100.0%. 　　The results indicated exceed the drinking water quality standards include for aluminum of TTW-B13 in New Taipei City (Zhong-fu water treatment plant), TTW-B15 in New Taipei City (Shi-ding water treatment plant), TTW-E04 in Hsinchu County (Kan-sai water treatment plant), TTW-E04-1 in Hsinchu County (Kan-sai water distribution point: Kan-sai township), HAA5 of TTW-B15 in New Taipei City (Shi-ding water treatment plant), However, the test locations with analytes that exceeded or approached the drinking water regulatory limits of 2015, aluminum concentrations exceeding 0.2 mg/L, were followed up and re-tested in this year. The results indicated that the analytes re-tested met the drinking water quality standards except for aluminum of TTW-B13 in New Taipei City (Zhong-fu water treatment plant), which still exceeded the drinking water regulatory limits.

Drinking Water Quality Standards, Total Trihalomethane, Aluminum