Wadaslintang Reservoir has potential as a source of raw water for drinking water. One indicator to determine water quality is to use coliform bacteria. The purpose of this study is to determine the water quality of the Wadaslintang Reservoir as a source of drinking water based on microbiological parameters by referring to Government Regulation of the Republic of Indonesia Number 82 of 2001 concerning water quality management and water pollution control. The water sampling method is based on purposive sampling at ten research stations for eight months, microbiological analysis using the Most Probable Number (MPN) method. The results showed that the status of the Wadaslintang Reservoir was polluted based on total coliform criteria. Utilization of reservoir water as raw water for drinking water needs to be done further processing to anticipate deterioration in health.
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