This book deals with a research study conducted at District Dir Lower Khyber Pakhtunkhwa Pakistan. The study was carried out to assess the drinking water quality and to prepare thematic maps for the physico-chemical parameters. A total of 33 water samples were collected from the study area. The parameters studied were having varying range such as pH (6.5-8.5), electrical conductivity (680-3250 us/cm), alkalinity (190-420 mg/L), total hardness (260-615 mg/L), calcium hardness (150-340 mg/L), magnesium hardness (75-220 mg/L), total solids (880-1250 mg/L), total dissolved solids (720-2010 mg/L),...