Wall Flat (South Australia) – Trihalomethanes

Breaches to Australian Drinking Water Guidelines Levels Only

3/11/2005 Wall Flat Wundenberg Rd Trihalomethanes – Total 259 ug/L

25/01/2006 Wall Flat Wundenberg Rd Trihalomethanes – Total 288 ug/L

18/05/2006 Wall Flat Wundenberg Rd Trihalomethanes – Total 266 ug/L

4/08/2006 Wall Flat Wundenberg Rd Trihalomethanes – Total 302 ug/L

29/03/2007 Wall Flat Wundenberg Rd Trihalomethanes – Total 261 ug/L

10/05/2007 Wall Flat Wundenberg Rd Trihalomethanes – Total 263 ug/L

30/08/2007 Wall Flat Wundenberg Rd Trihalomethanes – Total 257 ug/L

13/09/2007 Wall Flat Wundenberg Rd Trihalomethanes – Total 266 ug/L

13/03/2009 Wall Flat Wundenberg Rd Trihalomethanes – Total 290 ug/L

13/01/2011 Wall Flat Starr Rd Trihalomethanes – Total 325 ug/L

10/02/2011 Wall Flat CT Starr Rd Trihalomethanes – Total 384 ug/L

8/03/2011 Wall Flat CT Starr Rd Trihalomethanes – Total 267 ug/L

28/12/2016 Wall Flat CT Starr Rd Trihalomethanes – Total 254 ug/L

23/1/2017 Wall Flat CT Starr Rd Trihalomethanes – Total 266 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: https://water.epa.gov/drink/contaminants/in