The purpose of this project was to examine the water quality of the pre-chosen 242 drinking water systems and 38 simple tap-water systems of the 22 municipal counties or cities. There were 44 analytes for drinking water systems.The regulated analytes included 11 metals (arsenic, lead, selenium, chromium, cadmium, barium, antimony, nickel, mercury, silver and aluminum), 1 health affecting substance (cyanide), 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), which accounted for a total of 43 analytes.
The total test counts of the regulated analytes for tap-water systems were 4352, and the total test counts of the regulated analytes for simple tapwater systems were 540 respectively. Water examined for all tested locations met the required drinking water criteria, which had a passing rate of 98.3% and 99.9%. All analytes tested met the required drinking water criteria, which had a passing rate all of 100.0%.
The results indicated the content of aluminum exceeded the drinking water quality regulations include TTW-B02 which is one the distribution network of Yuan Shan water treatment plant in New Taipei City, TTW-W03 (Ban Li water treatment plant) in Lienchiang County; the content of Total Trihalomethanes (TTHMs) exceeded the drinking water quality regulation include TTW-V02 (Rong Hu water treatment plant) in Kinmen County, TTW-V02-1 (Wu Long Shan points of distribution) in Kinmen County. Focusing on concentration which exceed and approach the drinking water regulation in 2017, the results show that all of the test location had improved since 2018.