The main goal of this project is to monitor the water quality of nine cities and counties in the southern area of Taiwan, and to analyze the degree of pollution in various bodies of water so that trends in water quality can be observed. The result of this investigation can provide grounds for policy making to environmental protection authorities. 　　For river quality, 109 sampling sites covering 31 rivers (including main streams and tributaries) were monitored monthly. The results of 2009 showed that the water quality in the area of Zeng-Wen river, domestic rivers of Pingdong county and Taidong county were the best, the area of Jiang-Jun river, A-Gong-Dian river and Er-Ren river were found in relatively high extent of pollution. Since there was a major water shortage this year, specifically, a lack of rainfall from January to May, parts of some rivers were nearly dried up, so test results for most pollutants were high, and thus the percentage of serious pollution would tend to look high. Due to a lot of rainfall in August through October, the suspended solids in the rivers tend to be high thus the percentage of unpolluted rivers is low and over 50% of the results indicated the rivers were intermediately polluted. As a whole, the highest percentage of the water quality is 33.3%, it belongs to unpolluted rivers. Overall, water quality in this year is nondifference between the recent years. 　　For ocean monitoring, 42 sampling sites covering eight coastal areas were monitored quarterly. Since the river affected the estuary areas during high tide, the concentrations of the inorganic salts were high. The results of 2009 showed that most monitoring data could meet quality criteria of each category except the results of dissolved oxygen and ammonia nitrogen monitored at estuary areas of Dong-Gang river. Because of typhoon coming before sampling period in 3rd quarter and 4th quarter, there are some index including salinity and inorganic salts different with the past results. 　　Eighteen sampling sites covering six beaches were monitored from May to September. The results of 2009 showed that most monitoring data could show excellent level. Due to a lot of rainfall at 10th August to 24th August, the results were showed common level. As a whole, Shan-Shui Beach had the best water quality. 　　Forty-five sampling sites covering 17 water reservoirs were monitored quarterly. The results of 2009 showed that most results of Lan-Tan Reservoir, Ren-Yi-Tan Reservoir, Zeng-Wen Reservoir, Wu-Shan-Tou Reservoir and Mu-Dan Reservoir were showed mesotrophic level. The other reservoirs belong to eutrophic level over 50%, Feng- Shan Reservoir where the water quality was the worst belonged to eutrophic level. 　　Ammonia nitrogen, iron, and manganese were the major analytes with results that reached the regulatory monitoring criteria in 202 ground water sampling sites for the nine cities and counties being monitored quarterly. The failing rates are between 10% to 90% for different cities and counties. To analyze graphically each monitoring item by Stiff-plotting and Piper-plotting showed a trend as same as last two years, there is no significant difference compared to the past. The highest percentage of Stiff-plotting and Piper-plotting is about 60%, it belongs to HCO3－+CO32─- Ca2＋ type and area of I.

Water Quality Monitoring；Water Quality Standards；Method Detection Limit