Water hardness by postcode in Australia

Enter your postcode: we match it to the nearest city with published hardness data and show its value, unit and source.

How the search works

Every postcode is matched to the nearest of the 307 cities in Australia for which a water supplier or regulator publishes hardness. Supply areas do not follow postcode boundaries, so the result is the figure of the nearest published supply. If the match is more than 15 km away we say so, and the annual water quality report of your own supplier is the better reference. Each city page names the source document and its date and, where the supplier publishes them, the values of each supply zone.

Australian Drinking Water Guidelines: aesthetic target ≤ 200 mg/L CaCO₃.

Regions

• New South Wales13 · 93 mg/L
• Queensland29 · 68 mg/L
• Victoria46 · 66 mg/L
• Western Australia218 · 98 mg/L

Largest cities in Australia

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