2008/21 – Ampitheatre (Victoria) – E.coli, Turbidity, Colour, Iron, Manganese

Ampitheatre (Victoria): E.coli (Regulated Water Supply/Non Potable Water Supply)
2008/9. Ampitheatre E. coli – 5 orgs / 100 mL. (Max Result) – 80.8% samples no E.coli
2009/10. Ampitheatre E. coli – 110 orgs / 100 mL. (Max Result) – 53.8% samples no E.coli
2010/11. Ampitheatre E. coli – 66orgs/100 mL. (Max Result) – 57.7% samples no E.coli

2011/12 E.coli Amphitheatre * Amphitheatre 15 max Result – 66.7% (samples no E.coli)

2012/13: E,coli Amphitheatre * Amphitheatre  270orgs / 100 mL. (Max Result) Result 75.0% (samples no E.coli)

2013/14 E.coli Amphitheatre * Amphitheatre   3orgs / 100 mL. (Max Result) 83.3% (samples no E.coli)

2014/15: E.coli Amphitheatre * Amphitheatre  1orgs / 100 mL. (Max Result) 87.5% (samples no E.coli)

2015/16 Amphitheatre * E.coli Amphitheatre  120orgs / 100 mL. (Max Result) 62.5% (samples no E.coli)

2018/19 Amphitheatre * E.coli Amphitheatre  3orgs / 100 mL. (Max Result)

2019/20: Amphitheatre  E.coli Amphitheatre  2orgs/100 mL. (Max Result)

“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

Ampitheatre – Victoria – Turbidity (maximum levels during years)

2008/09: Ampitheatre (Victoria) – Turbidity 15 NTU

2009/10: Ampitheatre (Victoria) – Turbidity 14 NTU

2010/11: Ampitheatre (Victoria) – Turbidity 19 NTU

2011/12: Ampitheatre Turbidity 5.8NTU

2014/15: Ampitheatre Turbidity 5.1NTU

2015/16Ampitheatre Turbidity 14NTU

2016/17Ampitheatre Turbidity 19NTU

2017/18: Ampitheatre (Victoria) – Turbidity 8.8 NTU

2018/19: Ampitheatre (Victoria) – Turbidity 15 NTU (max)

2019/20: Ampitheatre (Victoria) – Turbidity 5.8NTU (max), 5.5NTU (av.)

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.

Ampitheatre (Victoria) – Colour (maximum levels)

2011/12 Ampitheatre Colour 60HU

2012/13 Ampitheatre Colour 65HU

2013/14 Ampitheatre Colour 25HU

2014/15 Ampitheatre Colour 35HU

2016/17Ampitheatre Colour 150HU

2017/18: Ampitheatre (Victoria) – Colour 19HU

2018/19: Ampitheatre (Victoria) – Colour 16HU

2019/20: Ampitheatre (Victoria) – Colour 40HU (max)

2020/21: Ampitheatre (Victoria) – Colour 35HU (max), 18HU (mean)

Based on aesthetic considerations, true colour in drinking water should not exceed 15 HU.

“… Colour is generally related to organic content, and while colour derived from natural sources such as humic and fulvic acids is not a health consideration, chlorination of such water can produce a variety of chlorinated organic compounds as by-products (see Section 6.3.2 on disinfection by-products). If the colour is high at the time of disinfection, then the water should be checked for disinfection by-products. It should be noted, however, that low colour at the time of disinfection does not necessarily mean that the concentration of disinfection by-products will be low…

Ampitheatre (Victoria) Iron (maximum levels)

2011/12 Ampitheatre Iron 2.8mg/L

2012/13 Ampitheatre Iron 0.8mg/L

2013/14 Ampitheatre Iron 0.5mg/L

2014/15 Ampitheatre Iron 1mg/L

2016/17Ampitheatre Iron 0.81mg/L

2017/18: Ampitheatre (Victoria)  – Iron 0.92mg/L

2018/19: Ampitheatre (Victoria)  – Iron 1.2mg/L (max)

2019/20: Ampitheatre (Victoria)  – Iron 0.81mg/L (max)

2020/21: Ampitheatre (Victoria)  – Iron 0.59mg/L (max)

Based on aesthetic considerations (precipitation of iron from solution and taste),
the concentration of iron in drinking water should not exceed 0.3 mg/L.
No health-based guideline value has been set for iron.

Iron has a taste threshold of about 0.3 mg/L in water, and becomes objectionable above 3 mg/L. High iron concentrations give water an undesirable rust-brown appearance and can cause staining of laundry and plumbing fittings, fouling of ion-exchange softeners, and blockages in irrigation systems. Growths of iron bacteria, which concentrate iron, may cause taste and odour problems and lead to pipe restrictions, blockages and corrosion. ADWG 2011

2017/18 – Ampitheatre (Victoria) – Manganese

2012/13 Ampitheatre Manganese 1mg/L

2015/16 Ampitheatre Manganese 0.71mg/L

2017/18 – Ampitheatre (Victoria) – Manganese 0.62mg/L

2018/19 – Ampitheatre (Victoria) – Manganese 0.58mg/L

2019/20 – Ampitheatre (Victoria) – Manganese 0.65mg/L

Manganese: ADWG Guidelines 0.5mg/L. ADWG Aesthetic Guideline 0.1mg/L
Manganese is found in the natural environment. Manganese in drinking water above 0.1mg/L can give water an unpleasant taste and stain plumbing fixtures