Across the United States, and across the world, pipes, treatment plants, and dams are reaching or have already exceeded the end of their design life. Maintenance funding has significantly lagged levels needed for acceptable maintenance of water and sewer systems for decades, leading to a need to replace large portions of water and sewer systems in a relatively short time span. The costs associated with replacing these essential systems will be enormous. Taking a comprehensive look at these systems to identify the risks associated with ageing infrastructure and optimal solutions to these risks within existing political and funding realities requires sophisticated analysis. Researchers within the JHU Water Institute are dedicated to providing such analysis, helping to ensure the safety and sustainability of the worlds water supply and wastewater management.