2012/16: Nettle Hill (South Australia) – Trihalomethanes

Nettle Hill (South Australia) – Trihalomethanes

Breaches to Australian Drinking Water Guidelines Levels Only

12/01/2012 Nettle Hill Nettle Hill Rd Trihalomethanes – Total 272 ug/L

5/04/2012 Nettle Hill Nettle Hill Rd Trihalomethanes – Total 267 ug/L

19/04/2012 Nettle Hill CT Nettle Hill Rd Trihalomethanes – Total 257 ug/L

3/05/2012 Nettle Hill CT Nettle Hill Rd Trihalomethanes – Total 260 ug/L

27/02/2014 Nettle Hill CT Nettle Hill Rd Trihalomethanes – Total 252 ug/L

24/04/2014 Nettle Hill CT Nettle Hill Rd Trihalomethanes – Total 260 ug/L

5/06/2014 Nettle Hill CT Nettle Hill Rd Trihalomethanes – Total 253 ug/L

31/12/2015 Nettle Hill CT Nettle Hill Rd Trihalomethanes – Total 275 ug/L

2/06/2016 Nettle Hill CT Nettle Hill Rd Trihalomethanes – Total 259 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