This book highlights one of the most important water pollutants known as Microplastics. It has been reported that humans and the environment are dealing with microplastics particles in water and aquatic media. Despite the fact that such pollution might have mainly started out from the sea, it is now in lakes, rivers, ponds and even drinking water. This book presents as overview of microplastics in freshwater environments in different regions around the world. It discusses the ecotoxicological effects of microplastics, the removal/remediation techniques of microplastics and the role of water/wastewater treatment plants in spreading microplastics. This book is a valuable resource, covering wide aspects of microplastics from sources, detection and characterization to removal and their fate in treatment plants.