The purpose of this project is to examine the water quality of the pre-chosen 364 drinking water systems and 36 simple tap-water systems of the 25 municipal counties (or cities). The items being tested include heavy metals (As, Pb, Se, Cr, Cd, Ba, Sb, Ni, Hg, Ag ; In, Mo only tested at simple tap-water systems), volatile organics (trichoroethylene, carbon tetrachloride, 1,1,1-trichloroethane, 1,2-dichloroethane, vinyl chloride, benzene, 1,4-dichlorobenzene, 1,1-dichloroethene), fluoride, MBAS (only tested at drinking water systems) and THMs , a total of 21 to 22 items. 　　The analytical results indicates that most of the analytes were detected in some drinking water systems except carbon tetrachloride, 1,1,1-trichloroethane, 1,2-dichloroethane, benzene and 1,4-dichloro- benzene were found to be not detected in the systems. Most of the analytes were found in some simple tap water systems except trichloroethylene, 1,1,1-trichloroethane, 1,2-dichloroethane, vinyl chloride, benzene and 1,4-dichlorobenzene were found to be not detected in these systems. This annual, because of heavy metals detected by ICP-MS, detection limits were lower than ICP-OES, and so detected frequency was higher than past years. The results indicated that only one value of vinyl chloride at one site(TTW-J09) of Yun-Lin county and one value of THMs at one site(TTW-W04) of Lien-Chiang county which did not meet the regulation, the test results for rest of the items all in compliance which the drinking water quality standards.

Drinking Water Quality Standards, Total Trihalomethane, Heavy Metals