In Taiwan, there is risk of the drinking water sources contaminated by pesticides and affecting the safty of drinking water. This project screened eight pesticides, which have high possibility to affect the safty of drinking water, for higher priority of investigation and evaluation. Considering the geographical location, drinking water treatment process, and argrecultue type at upstream of the water source, six representative drinking water treatment plants were selected for pesticides monitoring. All pesticides were not detected in all drinking water treatment plants, and also in the drinking water treatment units in the process, in the three monitors conducting in this project. Therefore this project evaluated the health risk and established the toxicity database of these pesticides by literatures review, regarding to the treatment process and performance for each pesticide. Besides, this project also reviewed the drinking water quality resgulation items regarding to pesticides and volatile organic compounds. This project considered the health risk and compared the regulation values with at least eight developed or developing contries. The results suggested the regulation value in the reasonable range. There is no urgency to revise the standard values of pesticides. This project also summarized the rules of using pesticides in water source protection area, and give some management suggestion regarding to drinking water source procetion.

pesticides, volatile organic compounds (VOCs), drinking water source protection area