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Environmental Water Quality Monitoring

Trophic state indices of reservoirs around Taiwan

No testing data

Oligotrophic

Mesotrophic

Eutrophic

Lienchiang Kinmen Penghu Te-Chi Reservoir : Mesotrophic 49 Nan-Hua Reservoir : Mesotrophic 45 Ching-Mien Reservoir : Eutrophic 58 Wu-Shan-Tou Reservoir : Eutrophic 56 Pai-Ho Reservoir : Mesotrophic 49 Mu-Tan Reservoir : Mesotrophic 49 Tou-She Reservoir : Eutrophic 57 Jih-Yueh-Tan Reservoir : Mesotrophic 41 Wu-She Reservoir : Eutrophic 55 Yung-Ho-Shan Reservoir : Mesotrophic 50 Feng-Shan Reservoir : Eutrophic 80 Cheng-Ching-Hu Reservoir : Eutrophic 56 A-Kung-Tien Reservoir : Eutrophic 52 Li-Yu-Tan Reservoir : Mesotrophic 43 Ming-Te Reservoir : Eutrophic 60 Shih-Men Reservoir : Eutrophic 50 IIPao-Shan Reservoir : Eutrophic 57 大埔水庫 Hushan reservoir : Eutrophic 51 Fei-Tsui Reservoir : Oligotrophic 36 Hsi-Shih Reservoir : Eutrophic 51 Hsin-Shan Reservoir : Mesotrophic 50 Tseng-Wen Reservoir : Mesotrophic 45 Jen-Yi-Tan Reservoir : Eutrophic 60 Lan-Tan Reservoir : Eutrophic 51 Pao-Shan Reservoir : Mesotrophic 42 Tung-Yung Reservoir : Eutrophic 69 Chiu-Kuei-Shan Reservoir : Eutrophic 53 Houwo : Eutrophic 59 Chu-Shui-Wo Lower Dam : Eutrophic 60 Chu-Shui-Wo Upper Dam : Eutrophic 56 No.1 Chin-Sha Reservoir : Eutrophic 61 Chin-Sha Reservoir : Eutrophic 56 Sheng-Li Reservoir : Eutrophic 59 Pan-Li Reservoir : Eutrophic 62 Ling-Hu Reservoir : Eutrophic 72 Shan-Hsi Reservoir : Eutrophic 63 Tien-Pu Reservoir : Eutrophic 67 Lien-Hu Reservoir : Eutrophic 68 Jin-Hu Reservoir : Eutrophic 66 Tai-Hu Reservoir : Eutrophic 75 Jung-Hu Reservoir : Eutrophic 74 Jinsha Reservoir : Eutrophic 71 Ran-Hu Reservoir : Eutrophic 77 Ching-Tien Reservoir : Eutrophic 70 Hsi-Hu Reservoir : Eutrophic 78 Hsiao-Chih Reservoir : Eutrophic 59 Chi-Mei Reservoir : Eutrophic 60 Hsi-An Reservoir : Mesotrophic 45 Hsing-Jen Reservoir : Eutrophic 74 Tung-Wei Reservoir : Eutrophic 72 Cheng-Kung Reservoir : Eutrophic 71

Statistics Time: 2025 Q1

Percentage of the number of severely-polluted
water monitoring stations in watersheds around the country

No testing data

0 ~ 10%

11 ~ 20%

21 ~ 40%

40% above

Yangang River :0 ~ 10% (0.00%) Keya River :0 ~ 10% (0.00%) Toucian River :0 ~ 10% (0.00%) Fongshan River :0 ~ 10% (0.00%) Sinfong River :0 ~ 10% (0.00%) Fusing River :0 ~ 10% (0.00%) Shezih River :0 ~ 10% (0.00%) Laojiie River :11~ 20% (14.00%) Nankan River :41% above (82.00%) Danshuei River :0 ~ 10% (0.00%) Huang River :0 ~ 10% (0.00%) Shuangsi :0 ~ 10% (0.00%) Beigang River :21 ~ 40% (29.00%) Sin Huwei River :41% above (80.00%) Jhuoshuei River :0 ~ 10% (0.00%) Wu River :0 ~ 10% (0.00%) Dajia River :0 ~ 10% (0.00%) Da-an River :0 ~ 10% (0.00%) Sihu River :0 ~ 10% (0.00%) Houlong River :0 ~ 10% (0.00%) Jhonggang River :0 ~ 10% (0.00%) Jhihben River :0 ~ 10% (0.00%) Lijiia River :0 ~ 10% (0.00%) Tai Pingsi :0 ~ 10% (0.00%) Beinan River :0 ~ 10% (0.00%) Siouguluan River :0 ~ 10% (0.00%) Hualien River :0 ~ 10% (0.00%) Meilun River :0 ~ 10% (0.00%) Sanjhan River :0 ~ 10% (0.00%) Liwu River :0 ~ 10% (0.00%) Heping River :0 ~ 10% (0.00%) Nan-ao River :0 ~ 10% (0.00%) Su-ao River :0 ~ 10% (0.00%) Sincheng River :0 ~ 10% (0.00%) Dongshan River :0 ~ 10% (0.00%) Lanyang River :0 ~ 10% (0.00%) Dezihkou River :0 ~ 10% (0.00%) Gangkou River :0 ~ 10% (0.00%) Baoli River :0 ~ 10% (0.00%) Sihchong River :0 ~ 10% (0.00%) Linbian River :0 ~ 10% (0.00%) Donggang River :0 ~ 10% (0.00%) Gaoping River :0 ~ 10% (0.00%) Agongdian River :11~ 20% (20.00%) Erren River :0 ~ 10% (10.00%) Yanshuei River :0 ~ 10% (0.00%) Zengwun River :0 ~ 10% (9.00%) 曾文溪流域 Jishuei River :11~ 20% (14.00%) 急水溪流域 Bajhang River :0 ~ 10% (0.00%) Puzih River :0 ~ 10% (0.00%) Fonggang River :0 ~ 10% (0.00%) Fangshan River :0 ~ 10% (0.00%) Shuaimang River :0 ~ 10% (0.00%) Jian River :0 ~ 10% (0.00%)

Statistics Time: May, 2025

Percentage of groundwater areas that
exceed the standard around Taiwan
3 2 33.00% NH3-N 1 Percentage Item Rank 3 2 1 Percentage Item Rank 33.00% TDS 3 33.00% Hardness 2 33.00% Mn 1 Percentage Item Rank 40.00% Mn 3 60.00% NH3-N 2 60.00% Fe 1 Percentage Item Rank 3 2 100.00% Mn 1 Percentage Item Rank 3 2 1 Percentage Item Rank 3 2 100.00% Mn 1 Percentage Item Rank 3 2 1 Percentage Item Rank 3 2 1 Percentage Item Rank 3 2 1 Percentage Item Rank

Statistics Time: 2025 Q1

Carlson trophic state index?

The index to assess the degree of eutrophication in reservoirs is called the Carlson Trophic State Index (CTSI). The concentrations of three parameters, including Secchi disc depth (SD), chlorophyll-a (Chl-a) and total phosphorus (TP), are used to calculate and form an index value, which can help determine the level of eutrophication of reservoirs.

Reservoir eutrophication degree over the years

River Pollution Index?

The River Pollution Index (RPI) is a comprehensive index used to assess river water quality. The concentrations of four parameters, including dissolved oxygen (DO), biochemical oxygen demand (BOD5), suspended solids (SS) and ammonia nitrogen (NH3-N), are used to calculate the RPI, which determines the level of pollution in river water. The levels of pollution are divided into four categories: non/mildly-polluted, lightly-polluted, moderately-polluted, and severely-polluted.

River RPI over the years

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