Based on the many studies related to the importance of clean water needs, the condition of clean water is increasingly becoming a serious problem and management needs to be minimized, especially in guaranteeing the lives of the population and for the sake of sustainable use of clean water. This study aims to analyze the quality of physics and organic-inorganic chemistry, and analyze the number of total coliform bacteria and Escherichia coli in well water in the densely populated slum residential. The research data was obtained by observing and conducting laboratory analysis in three slums in the city of Bandung, namely Kampong Pelangi, Kampong Cimaung, and Kampong Middle Mengger referring to the environmental quality standard threshold values based on Minister of Health Regulation Number 32 2017. Results The study showed that the quality of well water in slum areas for parameters of physics and organic-inorganic chemistry was not heavily polluted because it did not exceed the required environmental quality standards. The opposite results in the actual condition of water quality classified as heavily polluted are shown in microbiological parameters that have exceeded the quality standards, namely total coliform of 2400 APM/100 mL, and Escherecia Coli of 2-17 APM/100 mL. The parameter for increasing the maximum threshold for the condition of the quality of water in residential wells is due to the lack of order in settlement development and the layout of the distance between septic tanks adjacent to the location of well water accompanied by waste disposal from settlements. From the results of the Pollution Index (IP), it can be concluded that the status of consumptive water quality is 2 Parts which are categorized as Light Polluted, and 1 Part is categorized as Meets Quality Standards. The middle section of consumptive well water with the category of meeting quality standards. Meanwhile, the upper and lower sections are categorized as lightly polluted.