2010/13 + 2016/17: Cooltong (South Australia) – Trihalomethanes, E.coli

Cooltong (South Australia) – Trihalomethanes

14/04/2010 Cooltong TS- Cooltong Rd (3km from old store) Trihalomethanes – Total 274 ug/L

18/01/2011 Cooltong  Storey Ave (near old toilet) Trihalomethanes – Total 413 ug/L

16/02/2011 Cooltong Cooltong Rd (3km from old store) Trihalomethanes – Total 445 ug/L

16/03/2011 Cooltong Storey Ave (near old toilet) Trihalomethanes – Total 393 ug/L

14/02/2012 Cooltong Cooltong Rd (3km from old store) Trihalomethanes – Total 264 ug/L

13/03/2012 Cooltong Storey Ave (near old toilet) Trihalomethanes – Total 430 ug/L

6/03/2013 Orthcooltong Ave (near old toilet) Trihalomethanes – Total 274 ug/L

14/12/2016 Orthcooltong Ave (near old toilet) Trihalomethanes – Total 272 ug/L

Australian Drinking Water Guideline Level (Trihalomethanes) 0.250mg/L (250ug/L) (US Guideline 0.08mg/L)

Classical trihalomethanes consist of chloroform (CHCl3), dichlorobromoform (CHCl2Br),
dibromochloroform (CHBr2Cl) and bromoform (CHBr3).

“When chlorine is added to water with organic material, such as algae, river weeds, and decaying leaves, THMs are formed. Residual chlorine molecules react with this harmless organic material to form a group of chlorinated chemical compounds, THMs. They are tasteless and odorless, but harmful and potentially toxic. The quantity of byproducts formed is determined by several factors, such as the amount and type of organic material present in water, temperature, pH, chlorine dosage, contact time available for chlorine, and bromide concentration in the water. The organic matter in water mainly consists of a) humic substance, which is the organic portion of soil that remains after prolonged microbial decomposition formed by the decay of leaves, wood, and other vegetable matter; and b) fulvic acid, which is a water soluble substance of low molecular weight that is derived from humus”.

Cooltong (South Australia) – E.coli

March 8 2017: Cooltong Orthcoolong Avenue North (South Australia) – E.coli 1 cfu/100ml

May 9 2017: Cooltong Road (South Australia) – E.coli 3 cfu/100ml

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