This book is concern with the pure water. Water is a great gift of God. A study on comparative analysis of selected drinking water filtration plants was conducted at Haripur, Pakistan. The objective of this study was to know the design of drinking water plants in district Haripur and determine their efficiency against each other. Three filtration plants were selected for this purpose situated at T.I.P., main city and circular road. Each filtration plant was analyzed to assess their performance quality to provide effective water treatment for the consumers. Water must be purify otherwise it carries a lot of diseases which can lead us and other animals, to death.