access to safe drinking water has always been a challenge for Bangladesh due to the geogenic contamination in shallow aquifers. The objective of this study was to identify the depth for extracting safe water and to develop a developed to validate the indigenous knowledge of targeting safe depth based on sediment color. To address the preparing safe water atlas for a specific region in Bangladesh, serving as a decision-making tool for households. The atlas identifies depths at which tube-wells can be installed to obtain uncontaminated groundwater, helping people make informed choices and avoid potential health risks. Additionally, the safe water atlas can support the
