Sydney Water Mandatory 12-Month Backflow Inspection Standards
Sydney Water Backflow Prevention Compliance (Annual 12-Month Test)
Per Sydney Water Backflow Regulations and AS/NZS 3500.1, testable backflow containment devices (RPZD) on commercial and strata properties must undergo mandatory differential pressure testing every 12 months by an accredited backflow plumber, with inspection results lodged to Sydney Water within 30 days.