Water Quality Annual Report 2013/14 GOULBURN VALLEY WATER VALLEY GOULBURN Goulburn Valley Water Water Quality Annual Report 2013-2014 TABLE OF CONTENTS 1. Introduction ....................................................................................................................................... 5 1.1 Characterisation of water supply systems ............................................................................ 8 1.2 Improvements to water supply and treatment .................................................................. 11 1.3 Changes to water sampling localities ................................................................................ 12 2. Water treatment and quality management systems ................................................................... 13 2.1 Water treatment .................................................................................................................. 13 2.1.1 Water treatment processes and chemicals employed by Goulburn Valley Water ..... 16 2.1.2 Changes to water treatment processes and chemicals ............................................... 18 2.2 Issues ................................................................................................................................... 18 3. Quality of drinking water ................................................................................................................ 19 3.1 Escherichia coli .................................................................................................................... 19 3.1.1 Results ............................................................................................................................ 20 3.1.2 Actions in relation to non-compliance ........................................................................... 21 3.2 Chlorine based disinfection by-product chemicals ........................................................... 22 3.2.1 Results ............................................................................................................................ 23 3.2.2 Actions in relation to non-compliance ........................................................................... 27 3.3 Ozone based disinfection by-product chemicals ............................................................... 27 3.4 Aluminium ............................................................................................................................ 28 3.4.1 Results ............................................................................................................................ 29 3.4.2 Actions in relation to non-compliance ........................................................................... 30 3.5 Turbidity................................................................................................................................ 31 3.5.1 Results ............................................................................................................................ 32 3.5.2 Actions in relation to non-compliance ........................................................................... 32 3.6 Fluoride ................................................................................................................................ 33 3.6.1 Results ............................................................................................................................ 34 3.6.2 Actions in relation to non-compliance ........................................................................... 35 3.7 Other algae, pathogens, chemical or substance that may pose a risk to human health. 36 3.7.1 Results ............................................................................................................................ 37 Page 2 of 83 Goulburn Valley Water Water Quality Annual Report 2013-2014 3.7.2 Actions in relation to non-compliance ........................................................................... 58 3.8 Aesthetics............................................................................................................................. 59 3.8.1 Results ............................................................................................................................ 60 3.8.2 Actions in relation to non-compliance ........................................................................... 65 3.9 Analysis of results ................................................................................................................ 66 4. Emergency and incident management ........................................................................................ 71 Known or Suspected Contamination ............................................................................................ 72 Water Quality Incidents ................................................................................................................. 74 Other Incidents .................................................................................. Error! Bookmark not defined. 5. Complaints relating to water quality ............................................................................................. 75 6. Findings of the most recent risk management plan audit .......................................................... 77 7. Undertakings under section 30 of the act ................................................................................... 81 8. Regulated water ............................................................................................................................. 82 9. Further information ........................................................................................................................ 83 LIST OF TABLES Table 1.1 Source water Table 2.1.1 Water treatment processes Table 2.1.2 Water treatment chemicals Table 3.1.1 Escherichia coli Table 3.2.1 Chlorine based disinfection by-product chemicals - Chloroacetic acid Table 3.2.2 Chlorine based disinfection by-product chemicals - Dichloroacetic acid Table 3.2.3 Chlorine based disinfection by-product chemicals - Trichloroacetic acid Table 3.2.4 Chlorine based disinfection by-product chemicals – Trihalomethanes Table 3.4.1 Acid soluble aluminium Table 3.4.2 Summary of aluminium notifications under the Act Table 3.5.1 Turbidity Table 3.6.1 Fluoride Table 3.7.1.1 Health related parameters –Antimony Table 3.7.1.2 Health related parameters – Arsenic Table 3.7.1.3 Health related parameters – Barium Table 3.7.1.4 Health related parameters – Cadmium Table 3.7.1.5 Health related parameters – Chromium Page 3 of 83 Goulburn Valley Water Water Quality Annual Report 2013-2014 Table 3.7.1.6 Health related parameters – Copper Table 3.7.1.7 Health related parameters – Lead Table 3.7.1.8 Health related parameters – Manganese Table 3.7.1.9 Health related parameters – Mercury Table 3.7.1.10 Health related parameters – Molybdenum Table 3.7.1.11 Health related parameters – Nickel Table 3.7.1.12 Health related parameters – Selenium Table 3.7.2.1 Health related parameters – Chlorite Table 3.7.2.2 Health related parameters – Chlorate Table 3.7.2.3 Health related parameters – Cyanide Table 3.7.2.4 Health related parameters – Oxidised nitrogen (nitrate and nitrite) Table 3.7.3.1 Health related parameters – Organic compounds in source water Table 3.7.3.2 Health related parameters – Organic compounds in reticulation Table 3.7.3.3 Health related parameters – Chloral hydrate in reticulation Table 3.7.3.4 Health related parameters – Pesticides in source water Table 3.7.3.5 Health related parameters – Pesticides in reticulation Table 3.7.4.1 Health related parameters – Radiological Table 3.7.5 Summary of health related parameter notifications under the Act Table 3.8.1 Aesthetic related parameters – pH Table 3.8.2 Aesthetic related parameters – True colour Table 3.8.3 Aesthetic related parameters – Electrical conductivity Table 3.8.4 Aesthetic related parameters – Hardness Table 3.8.5 Aesthetic related parameters – Alkalinity Table 3.8.6 Aesthetic related parameters – Iron Table 3.9 Summary of Compliance with Water Quality Standards Table 5.1 Complaints relating to water quality Table 7.2 Actions on undertakings Table 10.1 Regulated water supplies LIST OF GRAPHS Graph 3.4 Acid soluble aluminium LIST OF FIGURES Figure 1.0 Drinking water quality policy Figure 1.1 Map of water supply systems Figure 1.2 O’Kanes Road raw water storage Figure 2.1 Jar Test Page 4 of 83 Goulburn Valley Water Water Quality Annual Report 2013-2014 1. Introduction This water quality annual report has been prepared in accordance with section 26 of the Safe Drinking Water Act 2003 and regulation 15 of the Safe Drinking Water Regulations 2005. It provides an overview of Goulburn Valley Water’s implementation and performance to the Act for the reporting period 1 July 2013 to 30 June 2014. The report is intended to provide relevant information in the following areas: Characterisation of supply systems Sources of drinking water Water treatment, including disinfection and fluoridation Quality of drinking water Emergency and incident management Complaints relating to water quality Audit outcomes Undertakings, exemptions or variations under the Act Regulated (non-potable) water supply systems To provide quality assurance of the drinking water quality delivered to our customers, Goulburn Valley Water has developed a comprehensive risk based management system. The Corporation’s drinking water quality management system (DWQMS) has been established using the principals of the Australian Drinking Water