The Town of Gilbert and the City of Chandler required additional surface water treatment capacity to serve a growing population.  Both municipalities have Central Arizona Project (Colorado River Water) supplies and desired that this resource provide a secondary and supplemental source of potable water. The municipalities are adjacent to each other and, after conferring and discussing common issues and challenges, concluded that a joint treatment plant would be the best alternative. The culmination of this process is the Santan Vista Water Treatment Plant which began treating and providing drinking water in May 2009.