2002/17: Victor Harbor (South Australia) – Trihalomethanes, Chloral Hydrate

Victor Harbor (South Australia) – Trihalomethanes

Breaches to Australian Drinking Water Guidelines Levels Only

19/03/2003 Victor Harbor Riverview Rd Trihalomethanes – Total 256 ug/L

11/06/2003 Victor Harbor Riverview Rd Trihalomethanes – Total 260 ug/L

11/03/2004 Victor Harbor Riverview Rd Trihalomethanes – Total 250 ug/L

6/04/2006 Victor Harbor Riverview Rd Trihalomethanes – Total 254 ug/L

15/03/2007 Victor Harbor Riverview Rd Trihalomethanes – Total 268 ug/L

7/06/2007 Victor Harbor Riverview Rd Trihalomethanes – Total 316 ug/L

13/03/2008 Victor Harbor Riverview Rd Trihalomethanes – Total 252 ug/L

5/06/2008 Victor Harbor Riverview Rd Trihalomethanes – Total 255 ug/L

12/03/2009 Victor Harbor Riverview Rd Trihalomethanes – Total 258 ug/L

14/01/2010 Victor Harbor Riverview Rd Trihalomethanes – Total 267 ug/L

8/04/2010 Victor Harbor Riverview Rd Trihalomethanes – Total 258 ug/L

23/09/2010 Victor Harbor Riverview Rd Trihalomethanes – Total 253 ug/L

16/12/2010 Victor Harbor Riverview Rd Trihalomethanes – Total 259 ug/L

10/02/2011 Victor Harbor Riverview Rd Trihalomethanes – Total 256 ug/L

10/03/2011 Victor Harbor Riverview Rd Trihalomethanes – Total 340 ug/L

7/04/2011 Victor Harbor Riverview Rd Trihalomethanes – Total 263 ug/L

5/05/2011 Victor Harbor Riverview Rd Trihalomethanes – Total 299 ug/L

12/01/2012 Victor Harbor Riverview Rd Trihalomethanes – Total 308 ug/L

9/02/2012  Victor Harbor  Riverview Rd Trihalomethanes – Total 261 ug/L

8/03/2012 Victor Harbor Riverview Rd Trihalomethanes – Total 303 ug/L

5/04/2012 Victor Harbor Riverview Rd Trihalomethanes – Total 296 ug/L

3/05/2012 Victor Harbor Riverview Rd Trihalomethanes – Total 304 ug/L

8/08/2013 Victor Harbor Riverview Rd Trihalomethanes – Total 269 ug/L

23/01/2014 Victor Harbor Riverview Rd Trihalomethanes – Total 268 ug/L

20/02/2014 Victor Harbor Riverview Rd Trihalomethanes – Total 276 ug/L

18/03/2014 Victor Harbor Riverview Rd Trihalomethanes – Total 281 ug/L

15/04/2014 Victor Harbor Riverview Rd Trihalomethanes – Total 281 ug/L

12/06/2014 Victor Harbor Riverview Rd Trihalomethanes – Total 262 ug/L

3/09/2015 Victor Harbor Riverview Rd Trihalomethanes – Total 253 ug/L

21/12/2015 Victor Harbor Riverview Rd Trihalomethanes – Total 264 ug/L

18/02/2016 Victor Harbor Riverview Rd Trihalomethanes – Total 254 ug/L

18/03/2016 Victor Harbor Riverview Rd Trihalomethanes – Total 287 ug/L

14/04/2016 Victor Harbor Riverview Rd Trihalomethanes – Total 261 ug/L

12/05/2016 Victor Harbor Riverview Rd Trihalomethanes – Total 283 ug/L

9/06/2016 Victor Harbor Riverview Rd Trihalomethanes – Total 269 ug/L

7/07/2016 Victor Harbor Riverview Rd Trihalomethanes – Total 269 ug/L

24/11/2016 Victor Harbor Riverview Rd Trihalomethanes – Total 261 ug/L

19/01/2017 Victor Harbor Riverview Rd Trihalomethanes – Total 289 ug/L

16/02/2017 Victor Harbor Riverview Rd Trihalomethanes – Total 293 ug/L

16/03/2017 Victor Harbor Riverview Rd Trihalomethanes – Total 275 ug/L

13/04/2017 Victor Harbor Riverview Rd Trihalomethanes – Total 287 ug/L

12/05/2017 Victor Harbor Riverview Rd Trihalomethanes – Total 282 ug/L

8/06/2017 Victor Harbor Riverview Rd Trihalomethanes – Total 257 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

Victor Harbour (South Australia) – Chloral Hydrate

11/9/02 Victor Harbor  Chloral Hydrate 22ug/L

10/9/03 Victor Harbor  Chloral Hydrate 22ug/L

16/9/04 Victor Harbor  Chloral Hydrate 22ug/L

17/3/05 Victor Harbor  Chloral Hydrate 22ug/L

15/9/05 Victor Harbor  Chloral Hydrate 22ug/L

25/9/06 Victor Harbor  Chloral Hydrate 20.4ug/L

22/10/09 Victor Harbor  Chloral Hydrate 20.1ug/L

29/7/10 Victor Harbor  Chloral Hydrate 21.1ug/L

19/10/10 Victor Harbor  Chloral Hydrate 24.2ug/L

2/6/11 Victor Harbor  Chloral Hydrate 20.6ug/L

20/10/11 Victor Harbor  Chloral Hydrate 24.2ug/L

 

Chloral hydrate is a disinfection by-product, arising from chlorination of water containing naturally occurring organic material (NOM). Chloral hydrate is a sedative and hypnotic drug. Long-term use of chloral hydrate is associated with a rapid development of tolerance to its effects and possible addiction as well as adverse effects including rashes, gastric
discomfort and severe renal, cardiac and hepatic failure.

2004 Australian Drinking Water Guideline: Trichloroacetaldehyde (chloral hydrate): 0.02mg/L

2011 Australian Drinking Water Guideline: Trichloroacetaldehyde (chloral hydrate): 0.1mg/L