2004 December + 2011/12- Jumbuk (Victoria) – E.coli

Dec 14 2004: Jumbuk – E.coli 

Jumbuk– 14/12/2004– 62 orgs/100ml
In September 2011, December 2011 and March 2012 E. coli non-compliance results were recorded in the Jumbuk sampling locality, with results of 2, 1 and 11 organisms /100mL in the respective samples above the limit of 0 organisms/100mL. All samples were located at a customer tap. Compliance with the SDWR for E. coli results was not achieved in the Jumbuk sampling area for the reporting period. The SDWR (2005) require at least 98% of all samples collected in any 12 month period to contain no E. coli. The percentage compliance for the Jumbuk sampling area for the reporting period was 94.2%. As per the reporting
guidelines, only the customer tap non-compliance sample is taken into statistical consideration. During the reporting period a secondary disinfection system was installed and commissioned as part of the risk management and compliance process (refer to section 8.7). The joints on the lid of the tank were also re- sealed.

Escherichia coli should not be detected in any 100 mL sample of drinking water. If detected
in drinking water, immediate action should be taken including investigation of potential
sources of faecal contamination.

“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