The North Head sewage treatment plant has a catchment of about 1.3million residents in the following local government areas: Northern Beaches, Hunters Hill, Ku-Ring-Gai, Blacktown, Mosman, Ryde, The Hills, City of Parramatta, Lane Cove
Liverpool’s treatment plant takes in a catchment of close to 180,000 people from the suburbs of Bardia, Hinchinbrook, Hoxton Park, Abbotsbury, Ingleburn, Prestons, Holsworthy, Edmondson Park, Austral, Cecil Park, Cecil Hills, Elizabeth Hills, Bonnyrigg Heights, Edensor Park, Green Valley, Pleasure Point, Casula, Hammondville, Liverpool, Moorebank, Wattle Grove, Miller, Cartwright, Lurnea, Warwick Farm, Chipping Norton, Voyager Point, Macquarie Links, Glenfield, Catherine Field, Gledswood Hills, Varroville, Leppington, West Hoxton, Horningsea Park, Middleton Grange, Len Waters Estate, Carnes Hill and Denham Court
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