(1) At present, the water quality of the rivers in Taichung City (18 stations) is generally stable and affected by geological influences. Manganese is the main element in the earth's crust. Under the condition that the pH of the water is medium and alkaline, most of them are non-dissolved. The state exists, the content of natural water is high.) The heavy metal manganese (Mn) is a project that often exceeds the standard. Some of the targeted stations, such as Daduxi and Da'anxi, are affected by the rising and falling tides in the river section of the river, and the conductivity is high, while the total phosphorus and ammonia nitrogen in the downstream of the Da'an Zhongke Phase III discharge. In the case of a high situation, a total of 1344 tests were performed between January and December, of which 1,103 were in compliance with the Bingy water standards, and the highest rate of compliance was 90.2% in September. 75.9 %~86.6 %, the total compliance rate was 82.1%. (2) The urban area drainage station (14 stations) except for the green river, the Liuchuan River and the south side of the river, all of which show the degree of water pollution of "moderate pollution". Among them, the green river RPI=2.17 is "light pollution" this year. , Liuchuan RPI = 6.06 is "serious pollution", and Nanbian Creek RPI = 1.84 belongs to "not (slightly) contaminated". (3) The drainage of the Taichung Port Area of ​​the Haidian River and the regional drainage (17 stations) showed “not (slightly) polluted” to “serious pollution”, while Wenyuxi RPI=1.96, the second largest row of RPI in Dingdian =1.59, Dingdian Shenzhen RPI=1.85 area drainage shows "not (slightly) contaminated" water pollution level. (IV) The water quality of the sea area (5 stations) showed that the water quality in the coastal areas of Taichung was very good. At present, 80 out of a total of 80 tests were in compliance with the water quality standards for surface waters in the Jiayu area, with a compliance rate of 100%. (5) Beach water quality (2 stops) The number of beach waters in the period from February to May is “not suitable”; the beach water quality in January, September, December and December is “normal”, reaching in June, July, August and October. The level of "excellent", in which E. coli, enterococci, and turbidity were affected by the current and the flow of Da'anxi, led to the failure of the beach to maintain a "good" grade throughout the year.

Not (slightly) contaminated, Mild pollution, Moderately polluted, Severe pollution