Implementation of Geographical Information System for Bacteriological Contamination Analysis on Refill Drinking Water Depot (Study in Tembalang District)Amelia Rahmitha, Endang Sri Utami and Marya Yenita SitohangE3S Web Conf., 31 (2018) 06014DOI: https://doi.org/10.1051/e3sconf/20183106014