2007/23 – Condingup (Western Australia) – Total Dissolved Solids, Sodium, Chloride, Silica

Condingup – Western Australia – Total Dissolved Solids

2007/08: Condigup (Western Australia) – Total Dissolved Solids 1060 mg/L (max)

2008/09: Condigup (Western Australia) – Total Dissolved Solids 1040 mg/L (max), 1017 mg/L (mean)

2009/10: Condigup (Western Australia) – Total Dissolved Solids 1043 mg/L (max), 1017 mg/L (mean)

2010/11 Condingup (Western Australia) Total Dissolved Solids 1081mg/L (max), 1047mg/L (mean)

2011/12 Condingup (Western Australia) Total Dissolved Solids 1044mg/L (max), 1033mg/L (mean)

2013/14 Codingup (Western Australia) Total Dissolved Solids  1092mg/L (max), 1057mg/L (mean)

2014/15 Condingup (Western Australia) Total Dissolved Solids 1053mg/L (max), 1030mg/L (mean)

2015/16 Condingup (Western Australia) Total Dissolved Solids 1029mg/L (max), 1022mg/L (mean)

2016/17 Condingup (Western Australia) Total Dissolved Solids 1052mg/L (max), 1042mg/L (mean)

2017/18 Condingup (Western Australia) Total Dissolved Solids 1024mg/L (max), 1010mg/L (mean)

2018/19: Condingup (Western Australia) Total Dissolved Solids 1036mg/L (max), 1009mg/L (mean)

2019/20: Condingup (Western Australia) Total Dissolved Solids 1049mg/L (max), 1012mg/L (mean)

2022/23: Condingup (Western Australia) Total Dissolved Solids 1017mg/L (max), 971mg/L (mean)


“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

Condingup (Western Australia) – Sodium

2013/14 Condingup (Western Australia) Sodium 330mg/L (max), 318mg/L ((mean)

2014/15 Condingup (Western Australia) Sodium 310mg/L (max), 304mg/L (mean)

2015/16 Condingup (Western Australia) Sodium 305mg/L (max), 299mg/L (mean)

2016/17 Condingup (Western Australia) Sodium 315mg/L (max), 311mg/L (mean)

2017/18 Condingup (Western Australia) Sodium 320mg/L (max), 303.8mg/L (mean)

2018/19: Condingup (Western Australia) Sodium 310mg/L (max), 299mg/L (mean)

2019/20: Condingup (Western Australia) Sodium 325mg/L (max), 305mg/L (mean)

2022/23: Condingup (Western Australia) Sodium 300mg/L (max), 289mg/L (mean)

“Based on aesthetic considerations (taste), the concentration of sodium in drinking water
should not exceed 180 mg/L….The sodium ion is widespread in water due to the high solubility of sodium salts and the abundance of mineral deposits. Near coastal areas, windborne sea spray can make an important contribution either by fallout onto land surfaces where it can drain to drinking water sources, or from washout by rain. Apart from saline intrusion and natural contamination, water treatment chemicals, domestic water softeners and
sewage effluent can contribute to the sodium content of drinking water.” ADWG 2011


Condingup (Western Australia) – Chloride

2013/14 Condingup (Western Australia) Chloride 420mg/L (max), 400mg/L (av)

2014/15 Condingup (Western Australia) Chloride 405mg/L (max), 391mg/L (mean)

2015/16 Condingup (Western Australia) Chloride 395mg/L (max), 393mg/L (mean)

2016/17 Condingup (Western Australia) Chloride 410mg/L (max), 401mg/L (mean)

2017/18 Condingup (Western Australia) Chloride 390mg/L (max), 382.5mg/L (mean)

2018/19: Condingup (Western Australia) Chloride 405mg/L (max), 383mg/L (mean)

2019/20: Condingup (Western Australia) Chloride 395mg/L (max), 387.5mg/L (mean)

2022/23: Condingup (Western Australia) Chloride 385mg/L (max), 373mg/L (mean)

“Chloride is present in natural waters from the dissolution of salt deposits, and contamination from effluent disposal. Sodium chloride is widely used in the production of industrial chemicals such as caustic soda, chlorine, and sodium chlorite and hypochlorite. Potassium chloride is used in the production of fertilisers.

The taste threshold of chloride in water is dependent on the associated cation but is in the range 200–300 mg/L. The chloride content of water can affect corrosion of pipes and fittings. It can also affect the solubility of metal ions.

In surface water, the concentration of chloride is usually less than 100 mg/L and frequently below 10 mg/L. Groundwater can have higher concentrations, particularly if there is salt water intrusion.

Based on aesthetic considerations, the chloride concentration in drinking water should not exceed 250 mg/L.

No health-based guideline value is proposed for chloride.” 2011 Australian Drinking Water Guidelines

Condingup (Western Australia) – Silica

2017/18 Condingup (Western Australia) Silica 320mg/L (max), 303.8mg/L (mean) (listed as Silcon in Water Corporation Water Quality Report 2017-18

To minimise an undesirable scale build up on surfaces, silica (SiO2) within drinking waters should not exceed 80 mg/L.
Silica present in water is usually referred to as amorphous silica (i.e. lacking any crystalline structure). When silica is dissolved within water it forms monosilicic acid:
SiO2 + 2H2O à Si(OH)4
When the concentrations of monosilicic acid increase, polymerisation of the silica occurs, forming polysilicic acids followed by formation of colloidal silica. Monosilicic acid and polysilicic acids are the forms of silica analysed when determining dissolved silica content.
The deposition of silica from solutions can occur via various mechanisms. The deposition of silica that can cause the most problems for the water industry is via silica’s ability to deposit on solid surfaces that have hydroxyl (OH) groups present. Surfaces that commonly have hydroxyl groups present are glass and metallic surfaces. For example, dissolved silica will react with the surfaces of glass and begin to form a white precipitate. The silica forms silicates on the surface, resulting in silica build-up. In cases where customer complaints occur due to scale build-up, water hardness and silica concentrations should be investigated to determine the cause.
Silica can be a problem in water treatment due to its ability to cause fouling of reverse osmosis (RO) membranes (Sheikholeslami and Tan, 1999, Ning 2002, Sahachaiyunta and Sheikholeslami 2002). This occurs when the dissolved silica of the concentrate becomes super-saturated, causing silicates to form in the presence of metals, and these deposit on the membrane surface. The silicate then dehydrates, forming hard layers on the membrane that reduce the effectiveness of the process… 2011 ADWG