The publication contains material from technology transfer seminars presented for the water supply community. The document provides utility managers and operators, regulators and technical specialists with guidance for preventing contamination and alternatives for treating public ground-water supplies that are contaminated. An understanding of the processes that affect the movement and degradation of contaminants in the subsurface is essential for effective ground-water quality management. Knowledge can be gained from chapters on 'Ground-Water Hydrology', 'Classification of Ground-Water Regions' and Ground-Water--Surface Water Relationship'.