Drinking water in thousands of WA homes is considered too salty and fails to meet a key benchmark of national guidelines, according to a report released by the Water Corporation. In its annual snapshot of drinking water quality, the corporation said supplies in a quarter of its metropolitan regions contained more dissolved solids than was deemed “good” under Australian Drinking Water Guidelines.
Testing results showed more than half of the city’s regions had at least one sample that breached the threshold for dissolved solids, which consist of inorganic natural salts and other elements. These include sodium, potassium, calcium, magnesium, chloride, sulphate, bicarbonate, carbonate, silica, organic matter, fluoride, iron, manganese, nitrate and phosphate.
The report revealed the issue was more pronounced across regional parts of the State, with some towns having water regarded as poor and likely to corrode household pipes and fixtures such as taps. The Water Corporation said water from all of its metropolitan and regional distribution outlets met the “extremely high” standards set by the Health Department and posed no risk to safety.
A spokeswoman for the utility said the worst affected city areas – around West Yokine, Two Rocks, Neerabup, Mt Yokine, Mt Hawthorn and Buckland Hill – relied heavily on groundwater. However, she said their breaches were only marginal and changes to the national guidelines from next year meant all of them were likely to fall within the threshold for dissolved solids.