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Is Adelaide’s Water Really the Hardest in Australia?
Not on the figures the utilities publish. Adelaide’s water comes in at about 97 mg/L of hardness on our water by postcode page, taken from SA Water, which makes it moderately hard. Brisbane and Ipswich sit at about 100, and parts of northern Perth reach 228. What every Adelaide suburb we checked does have is chlorine, and in a hot shower that’s the part you notice. A Suhae shower filter is made for exactly that.
Why people call Adelaide’s water hard
Ask around and you’ll hear it often: Adelaide has the hardest water in the country. Plenty of online guides repeat it. White marks on a glass shower screen or around the taps help the story along, because those marks are what most people picture when they hear “hard water”.
What SA Water publishes about hardness
SA Water measures hardness as the calcium and magnesium in the water, expressed as calcium carbonate in milligrams per litre. Its scale runs like this: below 60 mg/L the water may be corrosive, 60 to 200 mg/L is good quality water, 200 to 500 mg/L brings increasing scaling problems, and above 500 mg/L the scaling is severe. It counts anything over 200 mg/L as hard water, and says that’s more likely where a supply comes mainly from groundwater.
At about 97 mg/L, Adelaide sits in the middle of SA Water’s good quality band. Our water by postcode page shows that figure next to the other capitals.
Why the answers you read disagree
Most of the disagreement comes down to what’s being compared. One source quotes a city average, another quotes the top of a range. Perth shows how far apart those can be. Its suburbs run from 29 to 228 mg/L, so a Perth average and a Perth maximum give two very different numbers. There’s more on that in Perth hard water.
Then there’s the question of which places get counted. South Australia has many separate water supply systems, and some towns draw mainly on groundwater, which is where SA Water says hard water is more likely. A figure for a regional town, or for “South Australia”, can end up repeated as a figure for Adelaide.
Units add to the confusion. SA Water also publishes hardness in English, French and German degrees, so the same water can show up as quite different numbers depending on the unit a page uses.
Chlorine and chloramine in Adelaide
We read SA Water’s drinking water profile on 15 October 2026 for Salisbury in the north, Norwood in the east and Morphett Vale in the south. All three came back the same: a blend of water from Happy Valley Reservoir, the River Murray, other Mount Lofty Ranges reservoirs and the Adelaide Desalination Plant, filtered and treated using chlorine.
Not every South Australian supply is the same. SA Water has used chloramine since the 1980s in places including the Mid North, Yorke Peninsula and the southern Adelaide Hills, and says it’s more effective in long pipes. Its profile for the Summit system, which serves Stirling, Hahndorf and Mount Barker, lists chloramine. Type your suburb into SA Water’s drinking water profile to see which one reaches your tap.
What vitamin C does in an Adelaide shower
Whichever disinfectant your suburb gets, some of it is still in the water at the shower, because a little is meant to last all the way to the tap. Hot water and a closed bathroom door make chlorine easier to notice there than at the kitchen sink.
The vitamin C cartridge in a Suhae shower filter turns chlorine and chloramine into chloride as the water passes through, so it handles either kind of supply. KEWI tested it for certificate IW-230133: 99.9% of chlorine removed, and no chlorine detected through 6,000 litres.
Suhae Radiance goes on by hand in about 2 minutes with no tools, and the cartridge is changed every two to three months, depending on how much the household showers. Renting? It comes off the same way it went on. See shower filters for renters.
So Adelaide’s hardness sits mid-table among the capitals. The chlorine in a Salisbury, Norwood or Morphett Vale shower is real, and it’s what the vitamin C cartridge takes out.
