2017/22 – Dunedoo (New South Wales) – Selenium, Total Dissolved Solids, Hardness

Dunedoo (NSW)  Selenium

10/3/21: Dunedoo (NSW) Selenium 0.012mg/L


“Based on health considerations, the concentration of selenium in drinking water should not
exceed 0.01 mg/L.

Selenium and selenium salts are widespread in the environment. Selenium is released from natural and human-made sources, with the main source being the burning of coal. Selenium is also a by-product of the processing of sulfide ores, chiefly in the copper refining industry.

The major use of selenium is in the manufacture of electronic components. It is used in several other industries, and selenium compounds are used in some insecticides, in hair shampoos as an anti-dandruff agent, and as a nutritional feed additive for poultry and livestock.

Selenium concentrations in source waters are generally very low and depend on local geochemistry, pH and the presence of iron salts. Concentrations in drinking water supplies overseas are generally below 0.01 mg/L but groundwater concentrations as high as 6 mg/L have been reported in the United States.”

Australian Drinking Water Guidelines 2011

Dunedoo – New South Wales – Hardness

18/3/22: Dunedoo Hardness 402.4mg/L

28/9/21: Dunedoo Hardness 413.6mg/L

24/3/21: Dunedoo Hardness 373.7mg/L

10/3/21: Dunedoo Hardness 425.7mg/L

15/9/20: Dunedoo Hardness 350mg/L

9/3/20: Dunedoo Hardness 382.6mg/L

26/3/19: Dunedoo Hardness 352.6mg/L

25/9/18: Dunedoo Hardness 409.3mg/L

22/5/18: Dunedoo Hardness 418.4mg/L

25/9/17: Dunedoo Hardness 397.4mg/L


“To minimise undesirable build‑up of scale in hot water systems, total hardness (as calcium
carbonate) in drinking water should not exceed 200 mg/L.

Hard water requires more soap than soft water to obtain a lather. It can also cause scale to form on hot water pipes and fittings. Hardness is caused primarily by the presence of calcium and magnesium ions, although other cations such as strontium, iron, manganese and barium can also contribute.”

Australian Drinking Water Guidelines 2011

Dunedoo – New South Wales – Total Dissolved Solids

15/3/22: Dunedoo Total Dissolved Solids 694mg/L

28/9/21: Dunedoo Total Dissolved Solids 673mg/L

24/3/21: Dunedoo Total Dissolved Solids 648mg/L

10/3/21: Dunedoo Total Dissolved Solids 655mg/L

9/3/20: Dunedoo Total Dissolved Solids 675mg/L

26/3/19: Dunedoo Total Dissolved Solids 757mg/L

25/9/18: Dunedoo Total Dissolved Solids 598mg/L

22/5/18: Dunedoo Total Dissolved Solids 626mg/L

25/9/17: Dunedoo Total Dissolved Solids 612mg/L


“No specific health guideline value is provided for total dissolved solids (TDS), as there are no
health effects directly attributable to TDS. However for good palatability total dissolved solids
in drinking water should not exceed 600 mg/L.

Total dissolved solids (TDS) consist of inorganic salts and small amounts of organic matter that are dissolved in water. Clay particles, colloidal iron and manganese oxides and silica, fine enough to pass through a 0.45 micron filter membrane can also contribute to total dissolved solids.

Total dissolved solids comprise: sodium, potassium, calcium, magnesium, chloride, sulfate, bicarbonate, carbonate, silica, organic matter, fluoride, iron, manganese, nitrate, nitrite and phosphates…” Australian Drinking Water Guidelines 2011