The manual shows the purpose, scope, physicochemical and biological essence of methods, technologies and structures, design features of structures and devices of water supply systems. Methods of their calculation and design are given, equipped with the necessary reference graphic and tabular materials. Due attention is paid to investment design, assessment of environmental activities of enterprises, reliability and optimization of water supply systems, organization of sanitary protection zones. Detailed examples of calculation of the main structures and installations are given. The handbook is intended for engineers, teachers and university students involved in the design of water supply systems and structures.