The book "Microbiology and hydrobiology of natural and wastewater", created by the team of authors, is a unique study that immerses the reader in the world of microbes and aquatic ecosystems. This publication will become an indispensable assistant for students, graduate students, scientists and practitioners working in the field of ecology, biology, water supply and sanitation. On the pages of this book you will find a deep and comprehensive study of microbiological processes occurring in natural and wastewater waters. The authors carefully analyze how microbes affect water quality, its purification and restoration of ecosystems. The book examines both beneficial and pathogenic microorganisms, their role in biogeochemical cycles and interaction with the environment. The reader will be able to learn about modern research methods that help identify and assess the state of water resources, as well as about new technologies for wastewater treatment, which are becoming increasingly relevant in the face of global environmental challenges. This book will be of interest not only to specialists in the field of ecology and microbiology, but also to everyone who is interested in the state of the environment and wants to understand how microbiological processes affect our lives. Students and teachers of universities working in the field of biological and environmental sciences will find useful materials for their research and training courses in it .. The book will also be useful to representatives of authorities and environmental organizations that deal with the protection of water resources .. The topics raised in the book cover a wide range of issues: from the study of microbial diversity in various water bodies to the analysis of the impact of anthropogenic activities on aquatic ecosystems. The authors emphasize the importance of biodiversity conservation and ecosystem sustainability, which is especially relevant in light of climate change and environmental pollution. The book emphasizes the need for an integrated approach to water management, making it an important contribution to modern environmental science. The style of the authors is distinguished by scientific rigor, supported by current data and research, which makes the material accessible and understandable to a wide audience. The book includes many illustrations, graphs and tables that help to visualize complex processes and make reading more fascinating. This edition will be an excellent addition to the library of everyone who seeks to deepen their knowledge in the field of microbiology and hydrobiology. If you are looking for literature that will help you understand the complex issues of water ecology, understand how microbes affect water quality and what methods of purification exist, then “Microbiology and hydrobiology of natural and wastewater” is what you need. Get inspired, explore and discover new horizons in the world of science with this fascinating and enlightening book.