2006 & 2009/12: Clarendon (South Australia) – Trihalomethanes

Clarendon (South Australia) – Trihalomethanes

3/07/2006 Clarendon Grants Gully Rd (Community Hall) Trihalomethanes – Total 264 ug/L

7/12/2009 Clarendon Grants Gully Rd (Bakery) Trihalomethanes – Total 256 ug/L

15/02/2010  Clarendon  Grants Gully Rd (Bakery) Trihalomethanes – Total 266 ug/L

10/05/2010  Clarendon  Grants Gully Rd (Bakery) Trihalomethanes – Total 254 ug/L

9/05/2011  Clarendon Grants Gully Rd (Bakery) Trihalomethanes – Total 277 ug/L

21/11/2011 Clarendon  Grants Gully Rd (Bakery) Trihalomethanes – Total 255 ug/L

23/01/2012  Clarendon  Grants Gully Rd (Bakery) Trihalomethanes – Total 329 ug/L

13/02/2012  Clarendon  Grants Gully Rd (Bakery) Trihalomethanes – Total 288 ug/L

13/03/2012  Clarendon Grants Gully Rd (Bakery) Trihalomethanes – Total 360 ug/L

7/05/2012  Clarendon  Grants Gully Rd (Bakery) Trihalomethanes – Total 311 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”.