Drinking water quality data

We test water quality at our major storage reservoirs once it has been through the primary treatment process. Results are used to provide a typical analysis of Melbourne's water quality, which is based on data from the previous five years.

Typical analysis of Melbourne's water

Last update: July 2016

Please note:

  • all parameters are measured in milligrams per litre unless otherwise noted
  • values are rounded to the nearest decimal point
​Parameter/ source Cardinia Greenvale Silvan Winneke Tarago​ Yan Yean​
pH (units)​ 7.2-7.7 7.2-8.8 7.0-7.7 7.0-7.5 6.7-7.5 7.3-9.4
Colour (Pt/Co)​ 7​ 6​ 13​ 20 51 13
Turbidity​ (NTU) 0.6-1.8 0.7-2.5 0.55-1.3 0.45-5.5 1.1-6.5 0.7-3.7
Specific conductance (uS/cm)​ 45-57 59-81 38-52 74-120 100-120 170-260
Iron 0.06​ 0.098 0.07​ ​0.16 ​0.52 ​0.13
Manganese ​0.003 ​0.003 ​0.005 ​0.006 0.039 0.007
Fluoride​ 0.8 0.9 0.8 0.8 0.8 0.8
Aluminium - acid soluble​ 0.02​ 0.03 ​0.04 0.3 0.04 0.02
Arsenic​ <0.005​ <0.005​ <0.005​ <0.005​ <0.005​ <0.005​
Boron​ <0.05​ <0.05​ <0.05​ <0.05​ <0.05​ <0.05​
Bromide​ <0.05​ - <0.05​ - - -​
Cadmium​ <0.0005 <0.0005​ <0.0005 <0.0005​ <0.0005 <0.0005
Calcium​ 4.4​ 4.3 3.8 2.3 13.7 8.1​
Chloride​ 7.1​ 9.4 6.9 16.8 22.3​ 21.5​
Chromium <0.005​ <0.005​ <0.005​ <0.005​ <0.005​ <0.005​
Copper​ <0.001​ 0.02​ 0.16​ <0.001​ <0.001 <0.01
Cyanide​ <0.005​ <0.005​ <0.005​ <0.005​ <0.005​ <0.005​
Haloacetic acids:​ ​ ​ ​ ​ ​ ​
- Chloroacetic acid​ <0.005​ <0.005​ <0.005​ <0.005​ <0.005​ <0.005
- Dichloroacetic acid​ 0.007 0.004 0.03 0.008​ 0.008 0.001
- Trichloroacetic acid 0.007 0.005 0.02 0.007 0.007 0.006​
Hardness​ 16​ ​17 ​14.25 ​45 18 ​31
Lead​ <0.002​ <0.002​ <0.002​ <0.002​ <0.002​ <0.002​
Magnesium​ 1.4​ 1.6​ 1.2​ 2.6​ 2.6 2.6
Mercury​ <0.0001​ ​<0.0001 <0.0001 ​<0.0001 <0.0001 <0.0001
Nickel​ <0.002​ <0.002​ <0.002​ <0.002​ <0.002​ <0.002​
Nitrate​ 7.4 0.13 0.23 0.38 0.32 0.05​
Potassium​ 0.7​ 0.8 0.7​ 1.4 2.3 1.4
Selenium​ <0.002​ <0.002​ <0.002​ <0.002​ <0.002​ <0.002​
Silica as SIO2​ 4.5​ 5.4 5.9 3.7 8.4 2.2​
Sodium​ 4.7 5.6 4.5 10 13 10.9​
Sulphate​ 0.4 0.7 <2 11.3 16 13.25​
Total alkalinity as CaCO3​ 11.6 11.2 9.3 9.4 15.3​​ 12.5​
Total organic carbon​ 2.2 2.0 2.1 3.2 5.4 6.4​
Total phosphorus​ 0.007​ 0.007 0.007 0.008 0.004​ 0.009
Total dissolved solids​ 39​ 42 34 20 69 82​
Total trihalomethanes 0.032 0.018 0.022 <0.001 <0.001 0.046​
Zinc​ <0.01​ <0.01​ <0.01​ <0.01​​ <0.01​ <0.01​

Our Water Quality Annual Report (previously Annual Report to the Department of Health) provides a comprehensive account of drinking water quality issues for each financial year. Yearly summaries of water quality data specific to your region are available from your local water retail company.

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