In 2001, Berea College's administration building earned a LEED Silver rating, making it the first LEED-certified building in the state of Kentucky. The College's EcoVillage, a living and learning tool in sustainability, contains 50 student apartments, a child development laboratory, and a model sustainable home. The EcoVillage uses 75 percent less energy and water per capita than the standard household and produces a waste stream half as large. It uses the Ecological Machine, which relies on natural processes to clean sewage water to swimmable standards through a system of tanks filled with plants, fish, and other aquaculture. Much of this water is recycled to flush toilets. The College has a set of Ecological Renovation Standards for all campus renovations in order to maximize resource efficiency and incorporate green design components.