2007/12 + 2019 – Tenterfield (New South Wales) – E.coli, Iron, Nickel, Colour, Turbidity

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WARNING: Water supply ‘unsafe’ without boiling

TENTERFIELD residents are urged to take caution when using water due to poor raw water quality.

Tenterfield Shire Council said recent fires at the Tenterfield water supply dam have caused problems with water treatment, making drinking water in the Tenterfield township unsafe.

Council said all water used for drinking or food preparation should be brought to a rolling boil to make it safe.

2007/2012 – Tenterfield (New South Wales) – E.coli
From a total of 279 samples, 25 E. coli detections. 200cfu/100mL (max)
“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

2007/12 Tenterfield (NSW) – Iron

2007/12 – Tenterfield (NSW) – Iron 1.86mg/L (max), 0.693mg/L (mean)

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

2007/12 – Tenterfield (New South Wales) – Turbidity

2007/12: Tenterfield (New South Wales) Turbidity 14.2NTU (max), 4.07 NTU (mean)

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.

Tenterfield (New South Wales) Nickel

2007/12: Tenterfield (New South Wales) Nickel 0.03mg/L (max), 0.075mg/L (mean)

Nickel: ADWG Health Guideline 0.02mg/L. A chemical element and silvery white corrosion resistant metal with a golden tinge. 60% of nickel production is used in nickel steel (particularly stainless steel). In water, mainly a problem with nickel plated fittings. Main releases to the environment are from the burning of fossil fuels and in waste discharges from electroplating industries.

Tenterfield (New South Wales) – Colour

2007/12: Tenterfield Colour 48HU (max), 12.94HU (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…