Plumbing Approvals Plumbing approval application and inspection process Rainwater Tanks Installing a rainwater tank saves money and water. Find all the benefits of installing, maintaining ... On-site Sewerage Facilities Council offer residents comprehensive information regarding treating and disposing of wastewater on ... Greywater Systems Guidelines for reusing greywater in homes and gardens Backflow Prevention Installing and testing of devices to prevent the flow of water back into the drinking water supply.