Explore the essential guide to groundwater science with the newly released *Fundamentals of Groundwater*. This updated second edition is a comprehensive textbook that serves as an invaluable resource for both students and professionals in hydrogeology. It meticulously covers the intricacies of groundwater within the hydrologic cycle, integrating foundational principles of hydrogeology with contemporary applications to tackle pressing environmental challenges. This edition includes updated discussions on human impacts on aquifers and emphasizes sustainable groundwater management. Delve into key topics such as groundwater flow theory, hydraulic head, and Darcy's law, as well as the complex interactions between groundwater and surface water. The book goes beyond the basics and provides in-depth coverage on groundwater chemistry, contamination risks, and newly emerging contaminants, including PFAS and agricultural pollutants. With practical insights and robust methodologies for water resource investigation and groundwater sustainability, this textbook is perfect for undergraduate and graduate students as well as professionals working in geoscience and related fields. Equip yourself with the knowledge needed for addressing future challenges in groundwater management and environmental stewardship with *Fundamentals of Groundwater*!