Homes built starting next year in River Islands at Lathrop could slash their city water use 40 percent and maintain lush grass and landscaping even in a severe drought without violating mandatory water use reduction orders.Future homeowners could also cut energy use by as much as 20 percent while saving between $50 and $200 a month on water, sewer, and electric bills. Cambay Group is requiring future homes being built starting with lots sold to homebuilders later this year to have piping in place to allow an easy hook-up of a grey water recycling system. It will allow homeowners to have what has been described as “the world’s first practical home water and energy recycler” produced by Nexus eWater of San Diego installed.But instead of paying the price tag that runs as high as $10,000 when one unit is purchased and installed, Reclamation District 2062 that is under Cambay Group’s control is partnering with Nexus eWater.