This project implement contaminants screening process of drinking water quality regulation. Six unregulated contaminants were selected from Universe Contaminant Candidate List. Their concentration were monitored in six representative drinking water treatment plants, and their health risk in drinking water system in Taiwan were evaluated. This project also collected the monitoring histories of unregulated contaminants, and proposed a priority list of unregulated contaminants monitoring. Besides, boron, N-nitrosodimethylamine, N-nitrosodiethylamine, perfluorooctanoic acid, perfluorooctane sulfonic acid, and dibutyl phthalate were proposed to be included into Contaminant Candidate List. In addition, this project inspected 25 unregulated compounds of emerging concern in drinking water. Only di(2-ethylhexyl)phthalate have been tested with concentration higher than drinking water quality standard of other countries. After evaluating monitoring histories of di(2-ethylhexyl)phthalate, it was included into Regulation Determination List to assess if it is necessary to be regulated. This project also review and update toxicology database of 9 metals and 9 volatile organic compounds of drinking water quality regulation compounds. After collecting and review international drinking water management, this project suggested to put drinking water quality regulated and unregulated contaminants monitoring plan in Law. Besides, this project suggested to select a drinking water system to demonstrate the implement of water safety plan.

monitoring plan, water safty plan, nitrosamines