Relationship Between the Efficiency of Local Administrative Organizations' Water Supply Systems and Bacterial Contamination in Tap Water

Abstract

The purpose of this study was to analyze the relationship between the efficiency of the Local Administrative Organization's water supply system and the water quality in terms of bacterial contamination. It was a survey study, with a total of 630 samples of water supply systems. The research tool used the residual free chlorine test kit, the coliform bacteria test kit, and the water supply system efficiency evaluation guideline of the Department of Water Resources. Data were analyzed by mean, percentage, standard deviation, Independent T-test, and Spearman correlation statistics. Results of the study of the water supply system were 51.1% of the groundwater system and 48.9% of the surface water system. The structure of water supply systems was the model of the Department of Water Resources at 37.3%, and the model of the Department of Public Works at 28.4%. Efficiency evaluation results of most water supply systems were 79.04% fair level, followed by 12.50% good level. The results of water quality analysis on coliform bacteria at the end of the pipe found bacteria contamination at 88.3%. The water quality in terms of bacterial contamination was positively correlated with the efficiency of the local government water supply system in five aspects (r = 0.134) with a statistical significance of 0.05. It was found that the water supply system (positive relationship r = 0.132) and production control and water supply system maintenance (positive relationship r = 0.087) resulted in a statistically significant improvement in bacterial water quality.