St Helens (Tasmania) – Lead
2017-2018: St Helens Lead 0.0042mg/L (max), 0.0019mg/L (mean)
Lead Guideline reduced from 0.01mg/L to 0.005mg/L in June 2025. “The concentration of lead in water within premises may be higher, especially in older buildings, due to contact of the water with lead-containing plumbing products (enHealth 2021). A review found several Australian and international studies that detected up to 0.162 mg/L of lead in drinking water due to leaching from lead-containing plumbing materials including taps and lead service lines, suggesting that leaching of lead from lead-containing plumbing materials can be substantial (SLR 2023)… Based on health considerations, the concentration of lead in drinking water should not exceed 0.005 mg/L.”
St Helens (Tasmania) – Chloroketones
27/8/24: St Helens (Tasmania): 1,1,1-trichloropropanone 3.3 ug/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
St Helens (Tasmania) – Haloacetonitriles
27/8/24: St Helens (Tasmania) Dichloroacetonitrile 2.1ug/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
St Helens – Tasmania – Temperature
December 22 2015: St Helens (Tasmania) Longhill Reservoir – Temperature 21.2C
December 29 2015: St Helens (Tasmania) Steiglitz Beach – Temperature 20.4C
january 12 2016: St Helens (Tasmania) Longhill Reservoir – Temperature 22.6C
January 12 2016: St Helens (Tasmania) Steiglitz Beach – Temperature 21.5C
january 19 2016: St Helens (Tasmania) Longhill Reservoir – Temperature 22.1C
January 19 2016: St Helens (Tasmania) Steiglitz Beach – Temperature 22.1C
January 25 2016: St Helens (Tasmania) Steiglitz Beach – Temperature 21C
February 2 2016: St Helens (Tasmania) Steiglitz Beach – Temperature 21C
February 9 2016: St Helens (Tasmania) Longhill Reservoir – Temperature 20.3C
February 9 2016: St Helens (Tasmania) Steiglitz Beach – Temperature 20.5C
February 16 2016: St Helens (Tasmania) Steiglitz Beach – Temperature 20.2C
February 23 2016: St Helens (Tasmania) Steiglitz Beach – Temperature 20.7C
March 1 2016: St Helens (Tasmania) Steiglitz Beach – Temperature 21C
March 8 2016: St Helens (Tasmania) Longhill Reservoir – Temperature 20.1C
March 8 2016: St Helens (Tasmania) Steiglitz Beach – Temperature 20.3C
GUIDELINE
“No guideline is set due to the impracticality of controlling water temperature.
Drinking water temperatures above 20°C may result in an increase in the number of
complaints.
Temperature is primarily an aesthetic criterion for drinking water. Generally, cool water is more palatable than warm or cold water. In general, consumers will react to a change in water temperature. Complaints are most frequent when the temperature suddenly increases.
The turbidity and colour of filtered water may be indirectly affected by temperature, as low water temperatures tend to decrease the efficiency of water treatment processes by, for instance, affecting floc formation rates and sedimentation efficiency.
Chemical reaction rates increase with temperature, and this can lead to greater corrosion of pipes and fittings in closed systems. Scale formation in hard waters will also be greater at higher temperatures…
Water temperatures in major Australian reticulated supplies range from 10°C to 30°C. In some long, above-ground pipelines, water temperatures up to 45°C may be experienced…
The effectiveness of chlorine as a disinfectant is influenced by the temperature of the water being dosed. Generally higher temperatures result in more effective disinfection at a particular chlorine dose, but this may be counterbalanced by a more rapid loss of chlorine to the atmosphere (AWWA 1990).