The Orange County Sanitation District (OCSD) is a public agency in the state of California that provides wastewater collection, treatment, and disposal services for approximately 2.6 million people in central and northwest Orange County. OCSD is a special district that is governed by a board of directors consisting of 25 board members appointed from 20 cities, two sanitary districts, two water districts and one representative from the Orange County Board of Supervisors. OCSD has two operating facilities that treat wastewater from residential, commercial and industrial sources. It is the third largest wastewater treatment facility west of the Mississippi River. OCSD and the Orange County Water District were awarded the Stockholm Industry Water Award in 2008 for pioneering work to develop with Trojan Technologies (Canada) the Groundwater Replenishment System, the world’s largest water purification plant for groundwater recharge.[1][2] Orange County Sanitation District is commonly referred to as OCSD, though not to be confused with Orange County Sheriff's Department that shares the same acronym.[3]