2008/11 + 2014/15 – Landsborough (Victoria) – E.coli, Copper, Turbidity, Total Dissolved Solids

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Landsborough (Victoria): E.coli (Regulated Water Supply)
2008/9. Landsborough E. coli – 17 orgs / 100 mL. (Max Result) – 76.9% samples no E.coli  (Central Highlands Water Annual Drinking Water Quality Report 2008-9)
2009/10. Landsborough E. coli – 19 orgs / 100 mL. (Max Result) – 73.1% samples no E.coli  (Central Highlands Water Annual Drinking Water Quality Report 2009-10)
2010/11. Landsborough E. coli – 38 orgs / 100 mL. (Max Result) – 57.7% samples no E.coli  (Central Highlands Water Annual Drinking Water Quality Report 2010-11)

“Coliforms are Gram-negative, non-spore-forming, rod-shaped bacteria that are capable of aerobic and facultative anaerobic growth in the presence of bile salts or other surface active agents with similar growth-inhibiting properties. They are found in large numbers in the faeces of humans and other warm-blooded animals, but many species also occur in the environment.

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 2011

Landsborough – Victoria – Turbidity

2008/09: Landsborough (Victoria) – Turbidity 21 NTU (Maximum detection during year)

2009/10: Landsborough (Victoria) – Turbidity 13 NTU (Maximum detection during year)

2010/11: Landsborough (Victoria) – Turbidity 8.7 NTU (max), 2.1NTU (average)

Chlorine-resistant pathogen reduction: Where filtration alone is used as the water treatment
process to address identified risks from Cryptosporidium and Giardia, it is essential
that filtration is optimised and consequently the target for the turbidity of water leaving
individual filters should be less than 0.2 NTU, and should not exceed 0.5 NTU at any time
Disinfection: A turbidity of less than 1 NTU is desirable at the time of disinfection with
chlorine unless a higher value can be validated in a specific context.

Aesthetic: Based on aesthetic considerations, the turbidity should not exceed 5 NTU at the
consumer’s tap.

Landsborough (Victoria) – Copper

2008/09: Landsborough (Victoria) Copper 2.1mg/L

2009/10: Landsborough (Victoria) Copper 1.3mg/L

Based on health considerations, the concentration of copper in drinking water should not
exceed 2 mg/L.
Based on aesthetic considerations, the concentration of copper in drinking water should
not exceed 1 mg/L.

Copper is widely distributed in rocks and soils as carbonate and sulfide minerals.

Copper is relatively resistant to corrosion and is used in domestic water supply pipes and fittings. It is also used in the electroplating and chemical industries, and in many household goods. Copper sulfate is used extensively to control the growth of algae in water storages.

Copper is present in uncontaminated surface waters at very low concentrations, usually less than 0.01 mg/L. The concentration can rise substantially when water with a low pH and hardness remains in stagnant contact with copper pipes and fittings. Under these conditions, the concentration of copper can reach 5 mg/L or higher. In one extreme case overseas, a concentration of 22 mg/L was reported.

Landsborough (Victoria)  Total Dissolved Solids

2014/15 Landsborough/Navarre Total Dissolved Solids 750mg/L

GUIDELINE

“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.