Edited Book entitled Removal Technologies of Contaminants in Water explores various alternative treatment technologies that are possible in removing contaminants in water. Nowadays, water problems becoming one of the global issues to be concerned about as it involves all the lives on this planet. Unmanageable water will lead to many problems if it is not treated before flowing out at discharge, such as causing aquatic plants or animals’ death due to pollution. Various treatments have been used in treating water including biological, physical, and chemical treatment technologies. However, the application of the present treatments needs to be upgraded and environmentally friendly. Therefore, the application of membrane filtration, mitigation, anaerobic system, magnet technology, and technique are explained in this book. This book enlightens the reader regarding the various methods and technologies used to enhance the quality of water treatment.