This workbook is utilized in connection with a 40-hour course on sanitary surveys of water supply systems for biologists, chemists, and engineers with experience as a water supply evaluator. Practical training is provided in each of the 21 self-contained modules. Each module outlines the purpose, objectives and content for that section. The course stresses evaluation of structural and functional components of water supply systems. Structural components discussed include the physical plant, operations, maintenance, and administration. Functional components include the collection, treatment, distribution and control phases of these systems. (CS)