This document provides an overview of water treatment engineering. It discusses the objectives of water treatment, which are to supply clean and safe drinking water. It outlines the typical stages in a water treatment system, including intake, aeration/air stripping, coagulation/flocculation, sedimentation, filtration, and disinfection. The document also discusses some of the 21st century challenges facing water treatment, such as disinfection byproducts, emerging pathogens, and trace contaminants. Coursework is graded through assignments, tests, and a final exam.