Identification Of Iron (Fe) and Manganese (Mn) in Shallow Groundwater Potential Using Geographic Information System (Kramat Jati District, East Jakarta)

Abstract Well water is a source of water for household. However, shallow groundwater with a depth of less than 15 m carries a high risk of contamination. Kramat Jati is one of urban areas in the city of Jakarta where sources of groundwater pollution can come from livestock areas and bad sanitation. from physical indicators of water pollution, shallow groundwater in Kramat Jati District has characteristics that indicate pollution due to the solubility of iron (Fe) and manganese (Mn). This research aims to map the distribution of iron (Fe) and manganese (Mn) pollution in shallow groundwater in Kramat Jati District. Sampling was taken using the Stratified Random Sampling (SRS) method at a radius 250 m, 500 m, and 750 m from the livestock area. The total sample is 20 sampling points. Questionnaires are used to obtain clean water sanitation characteristics. The method used to map the distribution of pollution is the interpolation method with ArcGIS and Surfer software. The results from this analysis were used to create a map that delineates the actual spatial distribution of Fe and Mn in Kramat Jati District. The highest pollution concentration for iron parameters was 3.24 mg/l, and manganese 7.91 mg/l. Interpolation results show that the increase in groundwater concentration is dominant into northern and southern areas of the subdistrict. The main factors that cause pollution come from the distance between septic tank and well being less than <10 meters, and alluvial soil type in this area study. This shows that the groundwater in this area is not suitable as a source of drinking water and sanitation hygiene according to Minister of Health Regulation No. 2 of 2023. Therefore, it is necessary to carry out simple processing using filtration and it is necessary to provide a clean water piping system in this area.