The San Diego County Board of Supervisors, who are also the board members of the San Diego County Sanitation District, ap­proved a joint powers agreement for the East County Advanced Water Purification Program. The supervisors’ 5-0 vote Oc­tober 30 also appointed Super­visor Dianne Jacob as the sani­tation district’s representative on the Joint Powers Authority board which will also include representatives from the Padre Dam Municipal Water District, the Helix Water District, and the City of El Cajon.