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
22/2/18: Bendigo – Southern (Victoria) – Nickel
A sample, collected from the distribution system as part of Coliban Water’s sampling program, had an elevated level of nickel (0.036 mg/L), exceeding the health-based guideline value for
nickel (0.02mg/L) in the ADWG. The investigation undertaken has concluded that the nickel
exceedance appears to be an unexplainable anomaly. It was an isolated incident and not an
ongoing issue, and the probable cause of the elevated nickel result was contamination during
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.