Master water-quality engineering with this comprehensive textbook from The Bookish Owl. Focusing on contaminant fate and transport, this essential guide details fundamental equations and their application in designing environmental control systems for natural environments like rivers, lakes, and groundwater. Learn to assess safe waste assimilation, understand pollutant impacts, and analyze surface runoff from urban and agricultural watersheds. Ideal for upper-level undergraduates, graduate students, environmental scientists, and practicing engineers, this book emphasizes system design, remediation, and regulatory constraints, including use-attainability analyses and total maximum daily loads. With practical examples, end-of-chapter problems, and current U.S. water quality standards, this resource provides a thorough understanding of water-quality control in natural systems.