The book “Water Quality Control” by Leonid Sergeevich Alekseev is an indispensable educational material for students of secondary special educational institutions studying in the specialty 2912 “Water Supply and Sewerage” .. This publication not only highlights important aspects of water quality control, but also immerses the reader in the current problems faced by modern society in the field of water supply. Water is the basis of life, and its quality directly affects human health and the ecosystem as a whole. In his book, Alexeyev examines in detail the methods and technologies used to assess and control water quality, which makes his work especially valuable for future specialists in this field. Readers will be able to learn about various parameters that affect water quality, such as chemical composition, physical properties, and biological performance. The author focuses on the importance of regular monitoring and analysis, which is especially relevant in the context of global climate change and environmental pollution. The book will be of interest not only to students, but also to teachers, specialists in the field of ecology and water supply, as well as to anyone who wants to better understand the problems associated with the quality of water resources. It raises important topics such as the impact of pollution on human health, methods of water purification, and modern technologies used to improve the quality of water supply. These aspects make the book relevant and useful to a wide audience. Leonid Sergeevich Alekseev is an author with extensive experience in the field of water supply and ecology . His writing style is clear and accessible, making it easy for readers to assimilate complex scientific concepts. In his works, he seeks to combine theory with practical examples, which makes his books not only educational, but also fascinating. If you are familiar with his other works, such as “Ecology of reservoirs” or “Modern wastewater treatment technologies”, then you will be pleased to know that in “Water Quality Control” he continues to develop his ideas and approaches. The book “Water Quality Control” is not just a textbook, but a real find for everyone interested in environmental issues and sustainable development. It can be the basis for discussions about the future of water resources, how to maintain the purity and availability of water for future generations. Readers passionate about ecology, engineering, as well as those who want to contribute to the protection of the environment, will find in this book a lot of useful information and inspiration. If you are looking for a quality training manual for water quality control, which will help you not only in your studies, but also in your professional activities, then the “Water Quality Control” of Leonid Sergeevich Alekseev is exactly what you need. This book will be your reliable assistant in the study of the most important aspects of water supply and ecology, as well as open up new horizons in understanding complex processes related to water quality. Do not miss the opportunity to expand your knowledge and prepare for a future career in this important and relevant area!