Transactions of the American Society of Civil Engineers, Vol. LXXII, June, 1911: Water Purification Plant, Washington, D.C. Results of Operation is a comprehensive technical report detailing the design, construction, and operational outcomes of the Washington, D.C. water purification plant in the early 20th century. This volume, authored by Asa E. Phillips and presented to the American Society of Civil Engineers, provides an in-depth analysis of the plant's performance, focusing on the methods and technologies employed to ensure the delivery of clean and safe water to the city's residents. The book meticulously documents the challenges faced in purifying the Potomac River water, the engineering solutions implemented, and the scientific principles underlying the filtration and treatment processes. It includes detailed descriptions of the plant's layout, the materials and equipment used, and the operational protocols established to maintain water quality. The report is supported by extensive data, including tables, charts, and illustrations that track the plant's efficiency, the reduction of contaminants, and the overall improvement in public health outcomes. In addition to technical specifications, the volume discusses the broader implications of municipal water purification, highlighting the importance of engineering innovation in urban infrastructure. It examines the economic and social benefits of the project, the lessons learned during its operation, and recommendations for future improvements. This work stands as a valuable historical record for civil engineers, historians, and anyone interested in the evolution of public health and urban water systems in the United States.