2005/07 – Wedderburn (Victoria) – E.coli, Hardness, Total Dissolved Solids

Wedderburn (Victoria) – E.coli
19/2/07: Wedderburn (Victoria) 2org/100mL. (sample at customer tap)
No known cause. Possible bird entry. All possible entry points to the tank checked and sealed where necessary Chlorine residual at Korong Vale WTP OK. Re-sampling completed showing no further E.Coli

Thermotolerant coliforms are a sub-group of coliforms that are able to grow at 44.5 ± 0.2°C. E. coli is the most common thermotolerant coliform present in faeces and is regarded as the most specific indicator of recent faecal contamination because generally it is not capable of growth in the environment. In contrast, some other thermotolerant coliforms (including strains of Klebsiella, Citrobacter and Enterobacter) are able to grow in the environment and their presence is not necessarily related to faecal contamination. While tests for thermotolerant coliforms can be simpler than for E. coli, E. coli is considered a superior indicator for detecting faecal contamination…” ADWG

Wedderburn (Victoria) – Hardness

2005/06: Wedderburn (Victoria) Hardness 240mg/L (max), 195mg/L (mean)

2006/07: Wedderburn (Victoria) Hardness 230mg/L (max)


“To minimise undesirable build‑up of scale in hot water systems, total hardness (as calcium
carbonate) in drinking water should not exceed 200 mg/L.

Hard water requires more soap than soft water to obtain a lather. It can also cause scale to form on hot water pipes and fittings. Hardness is caused primarily by the presence of calcium and magnesium ions, although other cations such as strontium, iron, manganese and barium can also contribute.”

Wedderburn – Victoria – Total Dissolved Solids

2005/06: Wedderburn (Victoria) – Total Dissolved Solids 1500 μS/cm (max), 690μS/cm (min)

2006/07: Wedderburn (Victoria) – Total Dissolved Solids 1500 μS/cm (max)


“No specific health guideline value is provided for total dissolved solids (TDS), as there are no
health effects directly attributable to TDS. However for good palatability total dissolved solids
in drinking water should not exceed 600 mg/L.

Total dissolved solids (TDS) consist of inorganic salts and small amounts of organic matter that are dissolved in water. Clay particles, colloidal iron and manganese oxides and silica, fine enough to pass through a 0.45 micron filter membrane can also contribute to total dissolved solids.

Total dissolved solids comprise: sodium, potassium, calcium, magnesium, chloride, sulfate, bicarbonate, carbonate, silica, organic matter, fluoride, iron, manganese, nitrate, nitrite and phosphates…” Australian Drinking Water Guidelines 2011