2005/14 + 2017: Myponga (South Australia) – Trihalomethanes

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Myponga (South Australia) – Trihalomethanes

Breaches to Australian Drinking Water Guidelines Levels Only

11/02/2005 Myponga Main South Rd Trihalomethanes – Total 261 ug/L

7/04/2006 Myponga Main South Rd Trihalomethanes – Total 284 ug/L

16/03/2007 Myponga Main South Rd Trihalomethanes – Total 265 ug/L

8/06/2007 Myponga Main South Rd Trihalomethanes – Total 250 ug/L

13/03/2009 Myponga Main South Rd Trihalomethanes – Total 250 ug/L

11/02/2011 Myponga Main South Rd Trihalomethanes – Total 282 ug/L

3/06/2011 Myponga Main South Rd Trihalomethanes – Total 258 ug/L

16/12/2011 Myponga Main South Rd Trihalomethanes – Total 288 ug/L

30/12/2011 Myponga Main South Rd Trihalomethanes – Total 278 ug/L

27/01/2012 Myponga  Main South Rd Trihalomethanes – Total 296 ug/L

10/02/2012 Myponga Main South Rd Trihalomethanes – Total 320 ug/L

23/03/2012 Myponga Main South Rd Trihalomethanes – Total 357 ug/L

20/04/2012 Myponga Main South Rd Trihalomethanes – Total 306 ug/L

11/05/2012 Myponga Main South Rd Trihalomethanes – Total 255 ug/L

1/06/2012 Myponga Main South Rd Trihalomethanes – Total 261 ug/L

8/02/2013 Myponga Main South Rd Trihalomethanes – Total 256 ug/L

8/03/2013 Myponga Main South Rd Trihalomethanes – Total 275 ug/L

14/02/2014 Myponga Main South Rd Trihalomethanes – Total 274 ug/L

14/03/2014 Myponga Main South Rd Trihalomethanes – Total 279 ug/L

11/04/2014 Myponga Main South Rd Trihalomethanes – Total 289 ug/L

9/05/2014 Myponga Main South Rd Trihalomethanes – Total 278 ug/L

6/06/2014 Myponga Main South Rd Trihalomethanes – Total 266 ug/L

5/05/2017 Myponga Main South Rd Trihalomethanes – Total 270 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