Rocky Gully – Western Australia – Hardness

2010/11 Rocky Gully (Western Australia) Hardness 250mg/L (max), 132mg/L (mean)

2011/12 Rocky Gully (Western Australia) Hardness 260mg/L (max), 260mg/L (mean)

2013/14 Rocky Gully (Western Australia) Hardness 260mg/L (max), 253mg/L (mean)

2014/15 Rocky Gully (Western Australia) Hardness 260mg/L (max), 258mg/L (mean)

2015/16 Rocky Gully (Western Australia) Hardness 260mg/L (max), 250mg/L (mean)

2016/17 Rocky Gully (Western Australia) Hardness 270mg/L (max), 263mg/L (mean)

2017/18 Rocky Gully (Western Australia) Hardness 290mg/L (max), 278mg/L (mean)

2018/19: Rocky Gully (Western Australia) Hardness 280mg/L (max), 265mg/L (mean)

2019/20: Rocky Gully (Western Australia) Hardness 270mg/L (max), 260mg/L (mean)

2022/23: Rocky Gully (Western Australia) Hardness 280mg/L (max), 270mg/L (mean)

GUIDELINE

“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.”

Rocky Gully (Western Australia) Iron

2011/12 Rocky Gully (Western Australia) Iron 1mg/L (max), 0.404mg/L (av)

2013/14 Rocky Gully (Western Australia) Iron 0.6mg/L (max), 0.24mg/L (av)

Based on aesthetic considerations (precipitation of iron from solution and taste),
the concentration of iron in drinking water should not exceed 0.3 mg/L.
No health-based guideline value has been set for iron.

Iron has a taste threshold of about 0.3 mg/L in water, and becomes objectionable above 3 mg/L. High iron concentrations give water an undesirable rust-brown appearance and can cause staining of laundry and plumbing fittings, fouling of ion-exchange softeners, and blockages in irrigation systems. Growths of iron bacteria, which concentrate iron, may cause taste and odour problems and lead to pipe restrictions, blockages and corrosion. ADWG 2011

Rocky Gully – Western Australia – Total Dissolved Solids

2014/15 Rocky Gully (Western Australia) Total Dissolved Solids 602mg/L (max), 583mg/L (mean)

2015/16 Rocky Gully (Western Australia) Total Dissolved Solids 602mg/L (max), 585mg/L (mean)

2016/17 Rocky Gully (Western Australia) Total Dissolved Solids 607mg/L (max), 591mg/L (mean)

2017/18 Rocky Gully (Western Australia) Total Dissolved Solids 619mg/L (max), 603mg/L (mean)

2018/19: Rocky Gully (Western Australia)  Total Dissolved Solids 600mg/L (max), 581mg/L (mean)

2019/20: Rocky Gully (Western Australia) Total Dissolved Solids 604mg/L (max), 582mg/L (mean)

2022/23: Rocky Gully (Western Australia) Total Dissolved Solids 635mg/L (max), 619mg/L (mean)

GUIDELINE

“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