Water supply as well as sewage collection and disposal are provided by Central Highlands Water. Drinking water is sourced from a network reservoirs all located in the highlands to the east, however the majority is sourced from two main reservoirs—Lal Lal and White Swan. The Lal Lal Reservoir (built in 1970 with a capacity of ) is Ballarat's largest water catchment accounting for approximately two-thirds of the city's water usage. The White Swan reservoir (built in 1952 with a capacity) supplies most of the remainder. Since May 2008, the White Swan has been topped up by water from Bendigo's Sandhurst Reservoir through the Goldfields Superpipe with water originally sourced from the Goulburn River system. Kirks Reservoir (built between 1860 and 1862 with a capacity of ) and Gong Gong Reservoir (built in 1877 at Gong Gong, Victoria with a capacity of ) are historic main water supplies now maintained for emergency use. Other reservoirs supplying Ballarat include Moorabool reservoir (located in Bolwarrah, Victoria with a capacity of ), Wilson's Reservoir (located in the Wombat State Forest with a capacity of ), Beales reservoir (built 1863 located at Wallace with a capacity of ) and Pincotts reservoir (built 1867 located at Leigh Creek, Victoria with a capacity of ). Sewage is managed by two plants—the Ballarat North Wastewater Treatment Plant and the Ballarat South Waste Water Treatment Plant.