The purpose of this project was to examine the drinking water quality of the prechosen 212 drinking water systems and 38 simple tap-water systems of the 22 municipal counties or cities. The regulated analytes included 13 metals (arsenic, lead, selenium, chromium, cadmium, barium, antimony, nickel, mercury, silver , aluminum, indium and molybdenum ), 2 health affecting substance (cyanide and fluoride), 3 disinfection byproducts (total trihalomethanes (TTHMs), bromate 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), and 2 effect drinkability sensory substances(MBAs and Phenols). 　　Compared with drinking water criteria, which drinking water systems and simple tap-water systems has a passing rate of 99.05% and 92.11%. All testing result had a passing rate of 99.94%. 　　The results showed that the content of 2 sites metallic aluminum (As), 1 site metallic mercury (Hg) and 2 sites total trihalomethanes (TTHM) exceeded the water quality standard for drinking water in drinking water system.

Drinking Water Quality Standards, Total Trihalomethane, Aluminum, Mercury