This is a basic course in millwright’s theory for operators of water and wastewater treatment plants. A millwright is a craftsman or tradesman who installs, dismantles, repairs, reassembles, and moves machinery in factories, power plants, and construction sites. The intention is not to provide a comprehensive view of the duties of a millwright, but rather to acquaint the student with the knowledge of a millwright’s work that is most applicable to the maintenance of water and wastewater plant equipment. The course covers basic pumps, valves, motors and alignment, seals and bearings, bolts and fasteners, and concepts in plant safety with regards to cutting and welding, and basic material handling and rigging. The final module provides an opportunity to work with the college’s pilot drinking water treatment plant, producing water, and students will learn to explain the major components, treatment process steps and common problems and solutions via a combination of theory and learning by doing.