The book “Sanitary Engineering” highlights the current state of water supply and sanitation in developing countries. It also provides insight into the challenges and solutions in the field of water supply, sanitary, and environmental engineering. The book emphasizes the importance of communication between sector professionals to improve the delivery of services in the water supply and sanitation sector. It also establishes a link between improved water supply and sanitation and the overall development of a country.The book also discusses the challenges faced in rural areas, particularly in developing countries. Appropriate technology for rural communities is presented as part of the solution to the problem of sustainable delivery of services within the water supply and sanitation sector. These technologies are tailored to meet the specific needs of rural communities and are designed to be sustainable and cost-effective. The editor has collected reliable and scientifically proven information from various credible sources to provide readers with the latest and most accurate information available. The book is a compilation of contributions from various experts in the field, and the editor expresses gratitude to these contributors for sharing their knowledge and expertise.