2007/22 – Ntaria/Hermannsburg (Northern Territory) – E.coli, Hardness

Ntaria/Hermannsburg – E.coli

2010/11: Ntaria E.coli 1detection during year. 97% E.coli performance during year


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

Ntaria/Hermannsburg – Northern Territory – Hardness

2007/08: Hermannsburg Hardness 295mg/L

2008/09: Ntaria Hardness 335mg/L

2009/10: Ntaria Hardness 286mg/L

2010/11: Ntaria Hardness 315mg/L

2013/14: Ntaria Hardness 322mg/L

2015/16: Ntaria Hardness 313mg/L

2016/17: Ntaria Hardness 318mg/L

2021/22: Ntaria Hardness 300mg/L


“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.”

Australian Drinking Water Guidelines 2011