Australian Drinking Water Map

Tunbridge Disinfection Byproducts: Averages 2013-14:

Trihalomethanes: 260μg/L (Australian Guideline Level 250μg/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/index.cfm

A Snapshot of Tasmanian Non-Microbiological Detections in Drinking Water July 2013-June 2014. Selected Breaches of Australian Drinking Water Guidelines (Friends of the Earth Australia)

Tunbridge  (Tasmania) – Chloroketones 

24/7/24: Tunbridge (Tasmania): 1,1,1-trichloropropanone 2.1ug/L

Data are inadequate to set guideline values for chloroketones in drinking water. GENERAL DESCRIPTION The chloroketones are produced in drinking water as by-products of the reaction between naturally occurring organic matter and chlorine. No data are available on other sources or uses for these compounds. Concentrations of chloroketones in drinking water reported overseas are very low and are estimated at less than 0.01 mg/L.

TYPICAL VALUES IN AUSTRALIAN DRINKING WATER In major Australian reticulated supplies 1,1,1-trichloropropanone has been recorded in concentrations up to 0.02 mg/L, but it is usually below the limit of determination of 0.0005 mg/L. No data are available for other chloroketones.

LIMITING FORMATION IN DRINKING WATER The presence of chloroketones in drinking water can be minimised by removing naturally occurring organic matter from the source water, by reducing the amount of chlorine added, or by the use of alternative disinfectants.” 2011 ADWG

Tunbridge (Tasmania) – Haloacetonitriles 

24/7/24: Tunbridge (Tasmania)  Dichloroacetonitrile 3.8ug/L

“GUIDELINE
Data are inadequate to set guideline values for haloacetonitriles in drinking water
GENERAL DESCRIPTION
Haloacetonitriles are formed from organic precursors during chlorination or chloramination of drinking  water. Concentrations of dihaloacetonitriles reported overseas range up to 0.04 mg/L but are typically  less than 0.003 mg/L. Concentrations of trichloroacetonitrile are less than 0.001 mg/L.
Trichloroacetonitrile has been used as an insecticide. No data are available on uses for the other haloacetonitriles.
TYPICAL VALUES IN AUSTRALIAN DRINKING WATER
No data are available on concentrations of haloacetonitriles in Australian drinking waters”. ADWG 2011

2013-14+2024: Tunbridge (Tasmania). Disinfection Byproducts, Chloroketones, Haloacetonitriles

in ,
Tunbridge Disinfection Byproducts: Averages 2013-14: Trihalomethanes: 260μg/L (Australian Guideline Level 250μg/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/index.cfm A Snapshot of Tasmanian Non-Microbiological Detections in Drinking Water July 2013-June 2014. Selected Breaches of Australian Drinking Water Guidelines (Friends of the Earth Australia) Tunbridge  (Tasmania) – Chloroketones  24/7/24: Tunbridge (Tasmania): 1,1,1-trichloropropanone 2.1ug/L Data are inadequate to set guideline values for chloroketones in drinking water. GENERAL DESCRIPTION The chloroketones are produced in drinking water as by-products of the reaction between naturally occurring organic matter and chlorine. No data are available on other sources or uses for these compounds. Concentrations of chloroketones in drinking water reported overseas are very low and are estimated at less than 0.01 mg/L. TYPICAL VALUES IN AUSTRALIAN DRINKING WATER In major Australian reticulated supplies 1,1,1-trichloropropanone has been recorded in concentrations up to 0.02 mg/L, but it is usually below the limit of determination of 0.0005 mg/L. No data are available for other chloroketones. LIMITING FORMATION IN DRINKING WATER The presence of chloroketones in drinking water can be minimised by removing naturally occurring organic matter from the source water, by reducing the amount of chlorine added, or by the use of alternative disinfectants.” 2011 ADWG Tunbridge (Tasmania) – Haloacetonitriles  24/7/24: Tunbridge (Tasmania)  Dichloroacetonitrile 3.8ug/L “GUIDELINE Data are inadequate to set guideline values for haloacetonitriles in drinking water GENERAL DESCRIPTION Haloacetonitriles are formed from organic precursors during chlorination or chloramination of drinking  water. Concentrations of dihaloacetonitriles reported overseas range up to 0.04 mg/L but are typically  less than 0.003 mg/L. Concentrations of trichloroacetonitrile are less than 0.001 mg/L. Trichloroacetonitrile has been used as an insecticide. No data are available on uses for the other haloacetonitriles. TYPICAL VALUES IN AUSTRALIAN DRINKING WATER No data are available on concentrations of haloacetonitriles in Australian drinking waters”. ADWG 2011