Adelaide water hardness averages about 97 mg/L (as calcium carbonate) across the metro area. That figure is WaterScore’s calculation from SA Water data, November 2025. SA Water calls water hard above 200 mg/L. So the Adelaide metro average sits at about half that mark.
Your own suburb can read higher or lower.
This page gives the Adelaide numbers we can source, and only those. It shows you how to look up the reading for your own postcode. It also covers what hardness does in an Adelaide bathroom. For the national picture, see our guide to water hardness in Australia.
Note: This page is general information, not medical advice. A shower filter isn’t a medical treatment for eczema or any skin condition. If you have a diagnosed skin condition, consult a dermatologist.
Is Adelaide water hard or soft?
Adelaide water isn’t hard by SA Water’s own definition. The metro average is about 97 mg/L as calcium carbonate. SA Water treats water over 200 mg/L as hard. Adelaide sits at roughly half that level. Single supply zones can run higher, so check your own postcode.
The 97 figure is a metro average. It isn’t a reading for your street. WaterScore worked it out from SA Water data in November 2025.
Averages hide the range. One supply zone can differ from the next one. SA Water gives the number for your zone through its own lookup tool.
We don’t publish a suburb table on this page. We couldn’t trace the old suburb figures back to SA Water. So we pulled them.
What counts as hard water in Australia?
The Australian Drinking Water Guidelines set the scale. Under 60 mg/L is soft, and it can be corrosive. From 60 to 200 mg/L is good quality. From 200 to 500 mg/L brings more scaling. Over 500 mg/L means severe scaling. The 200 mark is aesthetic, not a health limit.
Those bands come from the Australian Drinking Water Guidelines. They use calcium carbonate as the unit. The guideline sets 200 mg/L to hold down scale in hot water systems.
The ADWG has no “moderately hard” band and no “very hard” band. Plenty of websites use those words anyway. They come from a common industry scale, not from the Australian guideline.
SA Water puts it in one line. More than 200 milligrams per litre is considered hard water. That’s the number to test your own reading against.
At about 97 mg/L, the Adelaide metro average lands inside the ADWG good quality band.
How hard is the water in your Adelaide suburb?
We can’t give you a sourced figure for each suburb. SA Water publishes hardness through one tool only. It’s called Your drinking water profile. You type in a postcode or a suburb. It returns your water source, your treatment and a full water quality report.
Here’s how to get your own number:
- Open SA Water’s Your drinking water profile tool.
- Type in your postcode or your suburb.
- Open the full water quality report.
- Find hardness, shown as calcium carbonate.
- Write down the number and the date you looked it up.
The date matters. A figure with no lookup date is worth very little a year later. Write both in the same note.
Your own number tells you what to expect at home. A low reading means less scale on the showerhead. A higher reading means more of it. It also tells you if a shower head filter for hard water is worth fitting.
Where Adelaide’s water comes from
SA Water draws on four water sources: reservoirs, groundwater, river sources and seawater through desalination. The River Murray is named as a supply for metropolitan Adelaide.
Each source carries its own mineral load. River water and groundwater pick up calcium and magnesium from rock and soil. Those two minerals are what hardness measures.
Your profile report names the source for your address. Two suburbs can draw from two different places. That’s the plain reason one Adelaide reading doesn’t fit every street.
We don’t give a seasonal pattern for Adelaide. No SA Water document on file shows one, so we say nothing about it.
How Adelaide compares with other capital cities
Perth and Adelaide sit close on the metro average. Perth comes in at about 96 mg/L. Adelaide comes in at about 97 mg/L.
Both numbers are WaterScore calculations. Perth’s figure uses Water Corporation 2023-24 data. Adelaide’s uses SA Water data, November 2025.
Parts of Perth run much higher than the Perth average. Our page on water hardness in Perth gives the Water Corporation figures area by area.
Melbourne is soft overall. Our Melbourne page answers the same question: is Melbourne water hard or soft? Sydney is soft too. Sydney Water puts greater Sydney at about 57 mg/L, checked September 2026.
What hard water does in an Adelaide home
Calcium and magnesium react with soap. They leave a film on the surface instead of rinsing away. You see it as scum on the shower screen and dull marks on taps.
Scale builds where the water gets hot or dries out. Kettle elements pick it up first. Showerhead nozzles block slowly, and the spray goes patchy.
Skin can feel tight after a shower. Hair can feel rough and look flat. We cover water hardness and hair in more detail on our hair page.
The Adelaide metro average sits in the good quality band. So these signs are milder here than in a 200 mg/L supply. They still show up on glass and chrome.
Can a shower filter help with Adelaide water?
It helps with what’s in the water at that one shower. Our filter reduces chlorine, heavy metals and sediment. It reduces calcium and magnesium too. It may help limit limescale on your showerhead and fittings. It isn’t a water softener. It doesn’t cover your whole house.
Our filter uses several media layers:
- PP cotton and a stainless steel mesh catch sediment
- KDF-55 reduces chlorine and heavy metals, and it works in hot water
- Calcium sulfite and activated carbon reduce chlorine
- Mineral and ceramic media sit in the last layers
It sits between your shower arm and your showerhead. It fits standard 1/2-inch shower arms. You don’t need tools. Thread tape and rubber rings come in the box.
A cartridge typically lasts 2-6 months in a home. The manufacturer rates it at about 38,000 litres (10,000 US gallons). Two cartridges come in the box.
Where to start
Look up your postcode this week. Write down the number and the date beside it.
Does your zone read near 200 mg/L or over it? Then scale and soap scum will show. Fit a shower head water filter to cut chlorine, calcium and magnesium at the shower.
Disclaimer
This article is general information about water hardness in Adelaide. It is not medical advice. A shower filter is not a medical treatment for eczema or any skin condition. If you have a diagnosed skin condition, consult a dermatologist.
Data note: the Adelaide metro average of about 97 mg/L (as calcium carbonate) is WaterScore’s calculation from SA Water data, November 2025. Suburb figures need an SA Water postcode lookup, with the date of the lookup recorded.
Last reviewed September 2026 by Lena Hartman
Common questions about Adelaide water hardness
Which Adelaide suburbs have the hardest water?
SA Water doesn’t publish a suburb hardness table, so we can’t rank them. The only sourced figure is WaterScore’s metro average of about 97 mg/L. Use SA Water’s drinking water profile tool for your own postcode. Treat any suburb ranking without a lookup date as guesswork.
Does Adelaide water leave limescale?
Yes, some. Any water with calcium and magnesium leaves scale when it heats up or dries. At about 97 mg/L, scale builds slower here than in a 200 mg/L supply. You still see it on kettle elements, glass screens and showerhead nozzles.
Do you need a water softener in Adelaide?
Most Adelaide homes don’t. SA Water calls water hard over 200 mg/L. The metro average is about 97 mg/L. That’s less than half the hard water mark. Check your own postcode before you spend. Dry skin and shower scale are the issue? A shower filter works on that one shower.
Is hard water in Adelaide a health risk?
No. The 200 mg/L figure in the Australian Drinking Water Guidelines is an aesthetic guideline. It’s about scale and taste, not about health. Hardness isn’t a health limit in Australian drinking water. If your skin or your scalp worries you, see a doctor.