Intended as a handbook for working well managers and operators, this is a practical and accessible guide to preventing, forestalling, and dealing with problems with wells. It provides the information necessary for well operators and managers to understand the many challenges that come with maintaining well performance. The material is presented in an understandable manner without talking down to the nonspecialists. Rather than focusing on some aspect of well cleaning, or a particular technical approach, it covers the scope of maintenance and rehabilitation, from planning to evaluation testing. It also addresses the crucial subjects of preventive design, maintenance monitoring (from electrical to biofouling), and evaluation testing.