The mission of the Grey Water/Black Water Knowledge Resource is to provide knowledge creation and sharing throughout USACE in the area of grey water and black water recycling systems. Grey water recycling systems receive discharge from bathtubs, showers, lavatories, clothes washers and laundry sinks. Grey water systems can be located at individual buildings, or gray water can be piped to a central treatment system from a group of buildings. The recycled water can be used for flushing toilets and urinals, and irrigation. Black water recycling involves the treatment of effluent from waste water treatment plants to a higher level of sanitation and then redistributing the water through purple piping systems to be used for flushing toilets and urinals, and irrigation. The Knowledge Resource can assist in a Life Cycle Cost Analysis to determine applicability and feasibility of these systems. When the systems are appropriate the grey water/black water Knowledge Resource can provide support in system design for treatment and piping distribution.