Annual Drinking Water Quality Report 2019/20 Further information For more information on the 2019/20 Annual Drinking Water Quality Report, or any other concerns regarding water quality, including opportunities to work with us on improving water quality services, please contact our Product Quality Team on 1300 656 007 or email us at [email protected]. barwonwater.vic.gov.au Table of Contents Introduction ........................................................................................................................................................................................... 5 Requirements for drinking water ................................................................................................................................................... 5 2.1. Meeting customer expectations ......................................................................................................................................... 5 2.2. Legislative requirements ........................................................................................................................................................ 5 2.3. Undertakings, Variations and Exemptions ...................................................................................................................... 6 Defining drinking water ...................................................................................................................................................................... 6 3.1. Regulated Water ........................................................................................................................................................................ 6 System Description ............................................................................................................................................................................. 7 4.1. Overview ....................................................................................................................................................................................... 7 4.2. Water quality localities ........................................................................................................................................................... 9 4.3. Source of water ....................................................................................................................................................................... 12 4.4. Water treatment ..................................................................................................................................................................... 13 4.5. Distribution ................................................................................................................................................................................ 16 4.6. Secondary disinfection ......................................................................................................................................................... 16 Quality management system ......................................................................................................................................................... 17 5.1. Overview ...................................................................................................................................................................................... 17 5.2. Hazard identification ............................................................................................................................................................. 18 5.3. Control measures ................................................................................................................................................................... 18 Critical control points ............................................................................................................................................................ 18 Maintenance programs ........................................................................................................................................................ 18 Trained operators ................................................................................................................................................................... 18 5.4. Verification and monitoring ................................................................................................................................................ 18 5.5. Continual improvement ....................................................................................................................................................... 18 5.6. System auditing/peer review ............................................................................................................................................. 19 5.7. Review of risk management plan ...................................................................................................................................... 19 Water quality for 2019/20 ............................................................................................................................................................. 20 6.1. Escherichia coli (E. coli) ........................................................................................................................................................ 21 Results .......................................................................................................................................................................................... 21 Analysis of results .................................................................................................................................................................. 23 6.2. Trihalomethanes (THMs) .................................................................................................................................................... 24 Results ........................................................................................................................................................................................ 24 Analysis of results.................................................................................................................................................................. 26 6.3. Turbidity ...................................................................................................................................................................................... 27 Results ......................................................................................................................................................................................... 27 Analysis of results ................................................................................................................................................................. 29 6.4. Fluoride ...................................................................................................................................................................................... 30 Page 1 Results ........................................................................................................................................................................................ 30 Analysis of results ................................................................................................................................................................. 33 6.5. Total chlorine ........................................................................................................................................................................... 34 Results ........................................................................................................................................................................................ 34 Analysis of results.................................................................................................................................................................. 36 6.6. Analysis of results – summary for regulatory standards ........................................................................................ 37 6.7. Other health related parameters ..................................................................................................................................... 37 Arsenic ......................................................................................................................................................................................... 37 Copper ....................................................................................................................................................................................... 39 Fluoride ...................................................................................................................................................................................... 40 Lead .............................................................................................................................................................................................. 41 Manganese ............................................................................................................................................................................... 42 Other .........................................................................................................................................................................................