Berea uses its own set of ecological design principles for construction projects, although the administration building is LEED-certified. The Ecovillage operates under rigorous performance goals, mandating a 75 percent reduction in energy- and water-use, and a 50 percent waste diversion rate. The village has a photovoltaic array, passive solar heating, and an "ecological machine," which treats wastewater via a system of bacteria, snails, plants, and fish.