Drinking water quality

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: January 2019

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)​ 7-7.6 7-7.9 6.8-7.8 7-7.4 7-7.3 6.8-7.4
Colour (Pt/Co)​ 0-5 0-10​ 3-13​ 0-2 0-5 0-5
Turbidity​ (NTU) 0.5-1.3 0.5-1.4 0.6-1.6

0-0.4

0-0.4 0-1
Specific conductance (uS/cm)​ 55-75 49-71 40-64 120-140 150-180 110-140
Iron 0.03-0.14 0.03-0.13 0.06-0.11 0-0.04 0-0.05 0-0.04
Manganese ​0.02-0.17 ​0-0.002 0-0.005 0-0.008 0-0.03 0-0.008
Fluoride​ 0.75-0.90 - 0.76-0.91 0.55-0.92 0.76-0.94 0.45-0.90
Aluminium - acid soluble​ 0.03-0.06 0.05-0.10 0.05-0.13 0.017-0.080 0-0.08 0.03-0.09
Arsenic​ <0.001​ <0.001​ <0.001​ 0-0.004 - 0-0.003
Boron​ 0-0.08 0-0.01 0-0.01 0-0.01 0-0.01 0-0.01
Bromide​ <0.05 <0.05 <0.05 <0.05 <0.05 <0.05
Cadmium​ - <0.0001 <0.0001 <0.0001 <0.0001 <0.0002
Calcium​ 4-6.5 3.7-5.2 3.0-5.0 5.6-7.8 8.0-10.0 5.6-7.8
Chromium < 0.001 < 0.001 < 0.001 < 0.001 < 0.001 < 0.001​
Copper​ 0.007-0.01 0-0.072 0.037-0.11 < 0.001-0.001 < 0.001-0.001 < 0.001-0.01
Haloacetic acids:​ ​ ​ ​ ​ ​ ​
- Chloroacetic acid​ (ug/l) < 3 < 3 < 3 < 3 < 3 < 3
- Dichloroacetic acid​ (ug/l) 3-9 3-7 5-21 < 1-17 5-10 < 1-17
- Trichloroacetic acid​ (ug/l) 18-20 3-10 28-48 7-30 5-12 ​7-30
Hardness​ 16-21 14-19 10-18 24-30 31-46 24-30
Lead​ <0.001 <0.001 <0.001 <0.001 <0.001 <0.001
Magnesium​ 1.1-1.5 1.3-1.6 1.0-1.5 2.0-2.7 2.2-2.8 2.0-2.7
Mercury​ <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 <0.0001
Nickel​ <0.001 <0.001 <0.001 <0.001 <0.001 <0.001
Nitrate​ 0.034-0.12 0.085-0.21 0.16-0.26 0.32-0.45 0.22-0.32 0.32-0.45
Potassium​ 0.54-0.76 0.68-0.75 0.62-0.68 1.2-1.5 1.9-2.4 1.2-1.5
Selenium​ <0.001 <0.001 <0.001 <0.001 <0.001 <0.001
Silica as SIO2​ 3.9-5.7 2.3-7.2 5.9-7.0 3.4-5.2 4.3-6.0 3.4-5.2
Sodium​ 4-5 4.5-6 3.5-4.8 9.3-12 11-15 9.3-12
Total alkalinity as CaCO3​ 10-19 9-12 7-12 9-14 23-18 9-14
Total organic carbon​ 1.3-1.7 1.8-1.9 1.7-3.0 1.2-1.6 1.7-2.3 1.2-1.6
Total phosphorus​ 0.004-0.007 0.006-0.009 0.005-0.009 <0.004-0.015 0.01-0.019 <0.004-0.015
Total dissolved solids​ 35-42 31-41 32-38 73-84 92-95 73-84
Total trihalomethanes 0.0057-0.022 0.0056-0.02 0.0092-0.035 0.012-0.029 <0.001-0.015 0.012-0.029
Zinc​ 0.002-0.005 0.002 <0.001-0.004 <0.001-0.004 0.002 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.

Last updated:
9 January 2019