Assessing Water Quality by Bioindicator Inat Pluit Reservoir in Jakarta Urban Area, Indonesia
Pluit Reservoir (6°6'58.13" S; 106°47'54.69" E) is an aquatic ecosystem in Jakarta City that functions as a flood control reservoir, water reservoir, as well as the water source for residents of North Jakarta. This study aims to assess the pollution level of Pluit Reservoir Waters using microalgae as the bioindicator and Saprobity Index as the calculation method. The research was conducted from April to July 2016, covering 11 sampling points. The morphological identification results found 6 microalgae phyla, i.e., Cyanophyta, Chrysophyta, Chlorophyta, Euglenophyta, Dinophyta, and Bacillariophyta. The microalgae abundance reached 400–73,700 cell/liter. The average value of Saprobity Index (X) of -0.93 indicates that the water body is categorised as moderately polluted due to organic and inorganic contaminants. The condition of Pluit Reservoir needs to be improved by implementing more intensive management, e.g., reducing pollution-potential activities including washing and waste disposal into the water body. Hence, the determination of pollution.