Melbourne doesn’t have hard water in most suburbs. WaterScore’s compilation of retailer data puts the metro supply near 18 mg/L (as calcium carbonate). That is soft. South East Water puts its own area at 12 to 45 mg/L. A few towns on the north west fringe run harder. Gisborne, Riddells Creek and Macedon sit near 107 to 108 mg/L. Darley sits near 95 mg/L.
This page gives the Melbourne numbers. It names the source behind each one. It also shows how to check your own suburb. Then it covers chlorine, because that is the part of Melbourne water you can still smell in the shower.
Important: This article is general information. A shower filter is not a medical treatment for eczema or any skin condition. If you have a diagnosed skin condition, consult a dermatologist.
Is Melbourne water hard or soft?
Melbourne water is soft. South East Water reports 12 to 45 mg/L across its supply area. It calls that soft. WaterScore puts the metro average near 18 mg/L. The Australian Drinking Water Guidelines put anything under 60 mg/L in the soft band. Melbourne sits far below that line.
South East Water supplies the south east suburbs. Its own page gives the 12 to 45 mg/L range and calls it soft. Yarra Valley Water covers the north and east. South East Water and Yarra Valley Water both draw the same bulk supply.
The Australian Drinking Water Guidelines set the bands. Under 60 mg/L is soft. 60 to 200 mg/L is good quality. 200 to 500 mg/L brings more scaling. Over 500 mg/L is severe scaling. The 200 mg/L figure is an aesthetic guideline, not a health limit.
We should be blunt about this. Most Melbourne homes have no hardness problem at all. If you want the plain difference between the two, read our guide to hard water vs soft water.
Why is Melbourne water so soft?
Melbourne collects most of its water from closed mountain forest catchments. Melbourne Water says these protected catchments give over 65% of the city’s drinking water. Rain runs off forest and rock with little contact with limestone. So the water picks up very little calcium and magnesium.
Melbourne Water is the bulk wholesaler. It fills the big storages and sends water to three retailers. The protected catchments sit north and east of the city, mostly inside national parks and state forest. Melbourne Water says this water “needs very little treatment”.
The Thomson storage sits in the Baw Baw high country in Gippsland. It’s not a Dandenong Ranges catchment, and it’s a long way from one.
Groundwater and limestone make water hard. Melbourne barely uses either one for drinking supply. That is the whole reason the city runs soft.
Which Melbourne areas have the hardest water?
The harder spots sit on the north west fringe, not in the western suburbs. Gisborne and Riddells Creek run about 108 mg/L. Macedon runs about 107 mg/L. Darley, near Bacchus Marsh, runs about 95 mg/L. All four still sit inside the ADWG good quality band.
| Area | Hardness (mg/L as calcium carbonate) | ADWG band |
|---|---|---|
| Melbourne metro average | about 18 | Soft |
| South East Water area | 12 to 45 | Soft |
| Werribee | about 23 | Soft |
| Darley | about 95 | Good quality |
| Macedon | about 107 | Good quality |
| Gisborne | about 108 | Good quality |
| Riddells Creek | about 108 | Good quality |
Every mg/L figure in this table comes from WaterScore’s compilation of Melbourne retailer data, checked 23 Sep 2026. The one exception is the South East Water range, which is that retailer’s own. The bands come from the ADWG.
There’s a supply reason behind those four towns. Greater Western Water’s drinking water quality report names their sources. Gisborne, Riddells Creek and Macedon take water from the Rosslynne water filtration plant. That plant draws on Rosslynne Reservoir. Darley takes a mix of Merrimu and Melbourne supply, not Rosslynne. Most other Greater Western Water towns take Melbourne Water bulk supply from Silvan, Sugarloaf or Greenvale.
Different source, different mineral load. That is why a Gisborne kettle scales up faster than a Richmond one.
Is Werribee water hard?
No. Werribee water is soft, at about 23 mg/L. Hoppers Crossing isn’t a hard water suburb either. An older version of this page put the western suburbs at 60 to 120 mg/L and blamed a limestone catchment. That was wrong, and we’ve corrected it.
Werribee and Hoppers Crossing sit in the Greater Western Water area. They take Melbourne Water bulk supply, the same soft water the rest of the city gets. At 23 mg/L, Werribee is softer than the South East Water average.
We had this wrong for a long time, and we’re not going to hide it. A Werribee reader doesn’t need a hard water filter. Selling one there would fix a problem that isn’t there.
Melton, Sunbury and Bacchus Marsh have no published suburb hardness figure we can stand behind. We’d rather name that gap than invent a number.
How to check your suburb’s water hardness
Three retailers supply Melbourne. Melbourne Water is the wholesaler, and it doesn’t publish suburb hardness. Start with the retailer that bills you.
- Yarra Valley Water covers the north and east. Use Yarra Valley Water’s results by suburb and search your suburb or postcode.
- South East Water covers the south east, the Mornington Peninsula and Frankston. Its appliances page gives the 12 to 45 mg/L range for the whole area.
- Greater Western Water covers the west and north west, plus Gisborne, Macedon and Bacchus Marsh. Check its annual drinking water quality report for your supply system.
Your bill names your retailer. If a report gives no hardness line, call the retailer and ask for the figure for your supply system. Ask for it as mg/L as calcium carbonate, so you can compare it with the ADWG bands.
Melbourne is soft, so what about chlorine?
Chlorine is the real shower water question in Melbourne. Melbourne Water disinfects with chlorine, chloramine or ultraviolet light. Chloramine is chlorine plus ammonia. The chlorine dose is typically under one milligram per litre. Every Melbourne shower carries some of it.
Hot water and steam are why you notice it. You smell chlorine in a closed shower more than in a cold glass of water. Some people notice dry or tight skin after a long hot shower. Some notice rough hair. Soft water doesn’t stop either of those.
A shower filter sits between the shower arm and the showerhead. Our multi-stage chlorine shower filter reduces chlorine, heavy metals and sediment. It also reduces calcium and magnesium, which matters more in Gisborne than in Glen Iris. We make no chloramine claim, because we have no test for it.
Our guide, what does a shower filter do, covers the mechanism, media layer by media layer.
How does Melbourne compare with other cities?
Melbourne is the soft one. Perth and Adelaide both sit near 96 to 97 mg/L, about five times Melbourne’s metro figure. Two Rocks, north of Perth, averages 228 mg/L in Water Corporation’s own tables. Sydney is soft too, near 57 mg/L. Melbourne has no suburb close to Two Rocks.
Those two city figures are WaterScore’s calculations from Water Corporation and SA Water data. Perth takes 30 to 40% of its supply from groundwater and 30 to 40% from desalination (Water Corporation, May 2024). Groundwater picks up far more calcium and magnesium than a closed forest catchment does.
Our Perth guide, does perth have hard water, covers it suburb by suburb using Water Corporation data. Our Adelaide guide, is adelaide water hard or soft, works from SA Water figures. A Melbourne reader who moves west should expect a very different shower.
Sydney is the closer match. Sydney Water publishes about 57 mg/L for greater Sydney, so it is soft as well. Melbourne is softer again. Our Sydney guide, is sydney water hard or soft, settles the question and explains why.
Do you need a shower filter in Melbourne?
Not for hardness, in almost every suburb. At 18 to 45 mg/L there is no scale problem to fix. Chlorine is the reason a Melbourne reader buys a shower filter. In Gisborne, Riddells Creek, Macedon or Darley, the mineral load is worth a second look too.
Here is the honest split for Melbourne.
- Inner, northern, eastern and south east suburbs: soft water. Buy a filter for chlorine, not for hardness.
- Werribee and Hoppers Crossing: soft water. Same answer.
- Melton, Sunbury and Bacchus Marsh: no published figure. Ask Greater Western Water before you buy anything.
- Gisborne, Riddells Creek, Macedon and Darley: about 95 to 108 mg/L. Still good quality water, but you may see scale on the showerhead and the kettle.
Results differ from person to person. A filter changes your water. It doesn’t change your skin type or your hair.
Melbourne water is soft, so hardness isn’t your problem. Chlorine reaches your skin every single shower. Our shower filter in Australia fits standard 1/2-inch shower arms and goes on without tools.
Frequently asked questions
Is Melbourne tap water hard or soft?
Melbourne tap water is soft. WaterScore puts the metro average near 18 mg/L as calcium carbonate. South East Water reports 12 to 45 mg/L in its area. The Australian Drinking Water Guidelines call anything under 60 mg/L soft. Most Melbourne homes see no scale at all.
Which Melbourne suburbs have hard water?
No Melbourne suburb reaches the ADWG scaling band. The highest figures sit on the north west fringe. Gisborne and Riddells Creek run about 108 mg/L. Macedon runs about 107. Darley runs about 95. The first three take Rosslynne Reservoir water. Darley sits on a Merrimu and Melbourne mix.
Does Melbourne water cause limescale?
Rarely. Limescale needs calcium and magnesium, and Melbourne water carries very little. At 18 mg/L your kettle and showerhead stay clear for years. Gisborne, Riddells Creek, Macedon and Darley run near 95 to 108 mg/L, so scale shows up faster in those towns.
Last reviewed September 2026 by Lena Hartman
Disclaimer: This page is general information about water quality. A shower filter is not a medical treatment for eczema or any skin condition. If you have a diagnosed skin condition, consult a dermatologist.