Spatial Analysis of Metal Content in Community Drinking Water Sources in Post Eruption of Sinabung Mountain in Karo District Sri Malem Indirawati 1 , Umi Salmah 2 , Lanova Dwi Arde 3 {srimalem@usu.ac.id 1 , umisalmah@usu.ac.id 2 , lanovadwi@usu.ac.id 3 } Public Health Faculty Universitas Sumatera Utara 123 Abstract. Sinabung mountain in North Sumatra Province has been erupted since August 2010. The post-eruption conditions caused changes in land cover and had direct impact on the surrounding area. The community used drinking water sources from springs and wells which have been exposed to metals contained in volcanic ash eruptions. This study aims to analyze the chemical quality of community drinking water sources. Amount 21 samples of drinking water sources representing the direction of volcanic eruption were analyzed in the laboratory using Atomic Absorption Spectrometry method. Each sample point was analyzed by using the Inversed distance weighted (IDW) method. The results of the laboratory showed that Fe concentrations exceeded the environmental quality standard, while other metals still met the requirements for drinking water quality. The order of metal concentration in drinking water Fe> Mn> Cd> Pb. The results of correlation between distance and Fe concentration obtained value r = 0.083. Keywords: Drinking water; metal; post-eruption 1 Introduction Sinabung mountain in North Sumatra Province has been erupted since August 2010. The post-eruption conditions caused changes in land cover and had direct impact on the surrounding area. The community used drinking water sources from springs and wells which have been exposed to metals contained in volcanic ash eruptions. This can have an impact on public health. The eruption caused changes in environmental quality, especially affecting the quality of community drinking water sources which contain potentially toxic ions and metals [1]. The sources of water used by community in post-eruption residential area is obtained directly from springs and bore well. Minister of health Regulation No.32,2017 concerning clean water and water safety plan [2] Drinking water used must meet physical, chemical, microbiological and radioactive quality requirements. The results of previous studies found Pb in the mount Sinabung’s soil in at depth of 0-5 cm and 0-15 cm was 61.01 ppm and 70.67 ppm, respectively [3]. Another research found that Sinabung volcanic ash contains element of iron was 0.58 -3.1%, sulfur 0.05-0.32%, Pb 1.5-5.3% [4]. The survey results in post-eruption settlement areas people complained about water quality. The purpose of this research is analyzing the chemical quality of community drinking water sources in Post eruption area and analyzing distance from center of eruption and concentration of metal in sources of drinking water. ICEHHA 2021, June 03-05, Flores, Indonesia Copyright © 2021 EAI DOI 10.4108/eai.3-6-2021.2310649