Abstract
Several types of research have shown that the household waste and septic tank have polluted the water of the wells in several small islands in the world and therefore requiring water well quality measurement. The research aims at measuring the water quality index of water well in small islands using the parameters of Coliform bacteria concentration, salinity, pH, and temperature. The research used survey analytics method with point time approach and combined with water quality index (WQI) formulation. There are 18 samples taken from the water well of Lae-Lae island, Barrang Lompo, and Barrang Caddi. The results have shown that the highest bacteria concentration of Coliform found was 2400 coliny/100 ml. The highest salinity is 0.007. The average temperature in well water was 20.5°C to 29.1 °C. The average pH was 7.6 to 8.9. Based on the water quality index (WQI) the calculation, the condition of 11 well water was moderately polluted, 3 well water was mildly polluted, and 4 well water was categorized as good. The results of the research showed that the development of water quality index (WQI) using Coliform parameters, salinity, pH and temperature enables identification of well water conditions in small islands and therefore informed the public regarding the quality of their well water.
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