Spatial Analysis of the Impact of Leachate on Groundwater around Sukosari Open Dumping, Karanganyar, Central Java, Indonesia

This study was conducted to determine the impact of leachate pollution from landfills on the quality of well water around them and to map the leachate distribution. A total of eight sample locations were taken for laboratory testing, of the eight samples one was taken at the leachate outlet and the others were taken from wells around the Landfill. Laboratory tests were conducted to analyze the parameters of Potential Hydrogen (Ph), Biological Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Total Suspended Solid (TSS), Mercury (Hg), Cadmium (Cd), Lead (Pb), and Iron (Fe). The results of the test show that the pH and mercury parameters do not exceed the quality standards, however, other parameters such as BOD, COD, TSS, CD, PB, and FE show values ​​that exceed the quality standards. The standard for drinking water quality is based on the World Health Organization (WHO) and the Regulation of the Minister of Health (PERMENKES) of the Republic of Indonesia No. 02 of 2023 and PP No. 22 of 2021. The data creates a pollution distribution map showing areas with significant contamination levels. This finding indicates a significant influence of activities at the landfill on the quality of the surrounding groundwater. This study highlights the importance of proper leachate management to prevent further pollution. And to provide education to the community, especially those who use wells for consumption purposes, to carry out treatment first before consuming.