Presenting an in-depth coverage, this textbook brings together and integrates key topics including water resources, wastewater, air, and solid waste in a single volume.The textbook introduces a unique approach that emphases on the water and wastewater treatments with its distribution system and engineering. It begins by discussing the public health and sanitation, then covers the wastewater collection system and design, wastewater characteristics, natural purification water, different wastewater treatments, industrial and rural wastewater. Finally, the emerging technologies in the reuse/recycle of waste and processes to conserve the environmental resources are discussed.The text will be useful for senior undergraduate and graduate students in the fields of civil and environmental engineering. Pedagogical features including solved problems, exercises and multiple-choice questions are interspersed throughout the book for better understanding. Discusses latest technologies and engineering design in water and wastewater management. Focusses on reuse and conservation of natural resources. Comprehensively covers topics on air pollution and noise pollution. Explains important topics including coagulation and flocculation, sedimentation, filtration, disinfection, water softening and water distribution. Includes pedagogical features including solved examples, exercises and multiple-choice questions with answers for better understanding of concepts.