Water Quality of Rivers and Ponds on DKI Jakarta. Thirteen big rivers, some small rivers, and 40 ponds spreadover districts at Jakarta city are potential to support human being life. As the population is growing and the USAge ofstream water is increasing, the condition and quality of rivers and ponds are changing. Crowd housing can affect riversand ponds pollution, as the people awareness about clean and healthy environment is less. Stream water pollutionassessment can be done by counting the effect of pollutant to life of stream water organisms. This assessment unit couldbe classified into physics, chemical, and biological parameter. To know the water quality, those parameters aretransformed into one single value, that is Water Quality Index. The calculation result of Water Quality Index valueshows that 83 % of rivers and 79 % of ponds are bad. This condition is caused by less people and governmentawareness to maintain rivers and ponds.