2015/16 – Biloela (Queensland) – E.coli, Turbidity

2015/16: Biloela (Queensland) – E.coli

Incident Description: The first non-compliance was a detection of E. coli from a routine sample taken on 1/09/2015 at Lion’s Park, Biloela. 1 E. coli organism per 100 mL was detected, with a disinfection residual of 0.19 mg/L

Incident Description: The third non-compliance was a detection of E. coli from a routine sample taken on 1/03/2016 at Lion’s Park, Biloela. 1 E. coli organism per 100 mL was detected, with a disinfection residual of 0.08 mg/L
Banana Shire Council Drinking Water Quality Management Plan 2015/16

“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

Biloela (Queensland) – Turbidity

2015 Apr-June: Biloela (Queensland) – Turbidity 17 NTU (Maximum detection during year)

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