The UC Davis West Village complex has been designed as the largest planned zero net energy community in the United States, implementing energy efficiency measures and producing renewable energy. In addition to the zero net energy endeavor, the complex developers asked the Center for Water-Energy Efficiency at UC Davis to investigate the possibility to achieve zero-net water use, where total water usage does not exceed the annual rainfall that lands on the site. The study identified that the complex could achieve zero-net water use through various water saving measures in addition to graywater recycling. The study further revealed the relevant relationship of water and energy. Water conservation measures could not be financially rationalized without factoring in the associated energy demands, reducing the payback period to less than five years.
More information can be found on the UC Davis Center for Water-Energy Efficiency website