Abstract
Domestic water quality survey and question survey were carried out at Palangkaraya City, Central Kalimantan, Indonesia. Although the coliform was not detected from the purified water in the effluent of the treatment plant, coliform were detected from the tap water in the city. The contamination of the tap water by the groundwater was clarified by the composition of the sodium ion and sulfate ion. Some tap water has high turbidity and high color. However, the reason of the high turbidity was not fully clarified. One of the causes was the lack of the continuous monitoring of the turbidity in the water treatment plant.