In this study, We have analyzed the information available about the “ District of Taipei Water Management office “, addressed water quality concerns regarding point and non-point source pollution, and some conclusions can be made as following. (1) There are 173 shops have been investigated and identified as point pollution sources, including 78 restaurants and 44 Hot spring resorts. (2) Point source discharge BOD annually contribute 65.23％ in total, discharge TP annually contribute 35.35％ in total, and discharge TN annually contribute 28.78％. Both BOD, and E coli, are most important items concerned. (3) In Wulai sub-watershed area, hot spring resort discharge BOD contribute 23.85％, and household without sewage service discharge BOD contribute 45.49％ in this area. (4) According to latest landcover data analysis shows that forest landuse contribute 93.35％, constructed area only 1.68％. (5) Nan-shih creek is flow-through river, water quality is highly influenced by hydrology condition. During dry season, human activities contribute 80％~90％ of BOD, while in wet season is 30％~40％. This cause the difficulty of water quality management, and more attention should be put on BOD, and E coli, when deal with the Nan-shih creek.

Watershed management, Pollution loading investigation, Pollution elimination.