2007/16: Willunga (South Australia) – E.coli, Trihalomethanes

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Willunga (South Australia) – E.coli

November 16 2016: Willunga (South Australia) – E.coli >100 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

Willunga (South Australia) – Trihalomethanes

Breaches to Australian Drinking Water Guidelines Levels Only

27/12/2007 Willunga St Georges Street Trihalomethanes – Total 254 ug/L

7/03/2008 Willunga St Georges Street Trihalomethanes – Total 252 ug/L

24/11/2010 Willunga St Georges Street Trihalomethanes – Total 251 ug/L

1/02/2012 Willunga Methodist Rd Trihalomethanes – Total 255 ug/L

8/02/2012 Willunga St Georges Street Trihalomethanes – Total 289 ug/L

29/03/2012 Willunga Methodist Rd Trihalomethanes – Total 280 ug/L

4/04/2012 Willunga St Georges Street Trihalomethanes – Total 283 ug/L

26/04/2012 Willunga Methodist Rd Trihalomethanes – Total 261 ug/L

13/06/2012 Willunga Methodist Rd Trihalomethanes – Total 273 ug/L

5/06/2013 Willunga St Georges Street Trihalomethanes – Total 257 ug/L

29/08/2013 Methodist Rd Georges Street Trihalomethanes – Total 276 ug/L

2/01/2014 Willunga St Georges Street Trihalomethanes – Total 259 ug/L

26/02/2014 Willunga St Georges Street Trihalomethanes – Total 283 ug/L

13/03/2014 Methodist Rd Georges Street Trihalomethanes – Total 286 ug/L

9/04/2014 Methodist Rd Georges Street Trihalomethanes – Total 317 ug/L

23/04/2014 Willunga St Georges Street Trihalomethanes – Total 297 ug/L

7/05/2014 Methodist Rd Georges Street Trihalomethanes – Total 330 ug/L

11/06/2014 Methodist Rd Georges Street Trihalomethanes – Total 348 ug/L

18/06/2014 Willunga St Georges Street Trihalomethanes – Total 290 ug/L

30/12/2015 Willunga St Georges Street Trihalomethanes – Total 257 ug/L

10/02/2016 Willunga St Methodist Rd Trihalomethanes – Total 283 ug/L

24/02/2016 Willunga St Georges Street Trihalomethanes – Total 256 ug/L

9/03/2016 Willunga St Methodist Rd Trihalomethanes – Total 314 ug/L

Trihalomethanes Australian Guideline Level 250μg/L (0.25mg/L)

Why and how are THMs formed?
“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 odourless, but harmful and potentially toxic. The quantity of by-products 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”. Source: http://water.epa.gov/drink/contaminants/in