The purpose of this project is to examine the water quality of the pre-chosen 164 drinking water systems and 125 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), volatile organics (trichoroethylene, carbon tetrachloride, 1,1,1-trichloroethane, 1,2-dichloroethane, vinyl chloride, benzene, 1,4-dichlorobenzene, 1,1-dichloroethene), pesticides(Endosulfan(I & II), Lindane, Butachlor, 2,4-D, paraquat, methomyl, carbofuran, MIPC, methamidophos, diazinon, parathion, EPN, monocrotophos), fluoride and THMs , a total of 33 items. This year, the systems to be tested were chosen in accordance with the demand of each water system. In 13 municipal counties (cities) including Yilan County, eight systems were selected in each municipal county (city), a total of 104 systems were tested for 33 items. Five systems were selected for testing from each of the rest 12 municipal counties (cities). A total of 60 systems were tested for 20 items which did not include pesticides. The simple tap-water systems in 12 municipal counties (cities) including Yilan county were tested for 20 items as well. Two to four systems were selected in each municipal county for the test. A total of 26 systems were tested. The analytical results indicates that most of the analytes were found to be not detected in the drinking water systems except very low concentrations of trichoroethylene, 1,1-dichloroethene and paraquat were detected in some systems. All of the analytes were found to be not detected in the simple tap water systems except trace carbon tetrachloride were found in one system. The results indicated that all water tested met the current drinking water quality standards.

drinking water quality standards,volatile organic compounds,total trihalomethane,pesticides