There are about 800 textile industries that located in Bandung and discharge their wastewaste directly into the Citarum River. This made the condition of the Citarum River was in heavily polluted status. In Dayeuhkolot there is WWTP area that treated wastewater from 26 textile industry around it and discharge its effluent into the Citarum River. Physical and chemical monitoring can't fully represent the impact of waste on the environment, especially for living things. Therefore it's necessary

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... performed biological monitoring that related to living things. One of method of biological monitaring that we can use is acute toxicity test (Whole Effluent Toxicity) to evaluate the performance of the WWTP so its effluent meet quality standards. This test consists of two stages: the preliminary test (range finding test) and the definitive test. Through this test we could obtaine LC50 values. Test animals that be used is Daphnia magna. Before the acute toxicity tests, characterization test is conducted. From characterization test is obtained some parameters are above the standards and toxic. LC50 values that is obtained in Monday, Tuesday, Wednesday, Thursday, Friday and Saturday were 16.8%, 31.9%, 37.5%, 32%, 34.4%, and 29.3%. LC50 values were not being too different or not fluctuated and still in the same concentration range. Then from definitive test we can obtained actual LC50 values. Actual LC50 values from Monday, Tuesday, Wednesday, Thursday, Friday and Saturday were 13.73%, 52.24%, 28.55%, 56%, 47.06%, and 21.99%. And the TUa values from these six samples were >1 so relatively toxic and is not yet safe discharged into the environment.