0–60 MG/L
Soft
Little or no scale. Soap lathers easily. Typical of rainwater tanks. Nothing to do.
WATER HARDNESS · IPSWICH & BRISBANE
Hard or soft?
Moderately hard.
Ipswich town water comes from the Brisbane River through the Mt Crosby plants, at about 80–115 mg/L as CaCO₃. Enter a figure to convert it for your dishwasher, coffee machine or softener.
IN APPLIANCE UNITS
Ipswich water,
converted.
Source: Urban Utilities: Water hardness. The current monthly figure is in the Seqwater City of Ipswich report
| Unit | 80 mg/L | 115 mg/L | Used by |
|---|---|---|---|
| German degrees (°dH) | 4.5 | 6.4 | Most dishwasher and coffee machine manuals |
| French degrees (°fH) | 8 | 11.5 | Some European appliances |
| Grains per gallon (gpg) | 4.7 | 6.7 | US appliances and softeners |
| Millimoles per litre (mmol/L) | 0.8 | 1.1 | Lab reports and some manuals |
WHAT IT MEANS
Soft to very hard,
in plain terms.
Bands from the USGS hardness scale.
61–120 MG/L
Moderately hard
A light white crust in the kettle and on shower screens over time, and slow scale on hot water elements. Set appliances to the figure below; a softener is rarely worth it at this level.
121–180 MG/L
Hard
Scale builds steadily in kettles, on taps and inside electric hot water tanks. A scale inhibitor on the hot water feed is worth considering, and appliance settings matter.
181+ MG/L
Very hard
Heavy scale, and above the 200 mg/L aesthetic guideline when it is that high. Unusual for Ipswich town water; check the figure, and talk to a plumber about protecting the hot water system.
WHY IT VARIES
Where the hardness comes from.
Brisbane River, drawn at Mt Crosby from the Mid Brisbane reach below Wivenhoe Dam. The minerals come from the catchment, so hardness rises after heavy rain washes more into the river. In November 2024 treated water reached 250 mg/L for a short time, above the 200 mg/L aesthetic guideline (an aesthetic limit, not a health one). Houses on rainwater tanks have soft water.
Hardness is not a health issue. It is about scale: in kettles, on shower screens and inside hot water systems. If the hot water is slow to heat or the element has failed, scale is one of the things a plumber checks. Hot water repairs in Ipswich ↗ · Check your suburb’s water ↗
QUESTIONS
Quick answers.
Is Brisbane water hard or soft?
Moderately hard. Ipswich and the Brisbane zones supplied from Mt Crosby have reported about 80 to 115 mg/L as CaCO₃, which the USGS scale calls moderately hard. That is well under the 200 mg/L aesthetic guideline in the Australian Drinking Water Guidelines.
Is Ipswich water hard?
Ipswich town water is moderately hard: about 80 to 115 mg/L as CaCO₃, or 4.5 to 6.4 German degrees. Houses on rainwater tanks have soft water.
What hardness setting should I use on my dishwasher?
Use German degrees (°dH): about 6.4 °dH for Ipswich town water. Find that figure in your manual’s hardness table and pick the matching setting. If your manual uses mmol/L, it is about 1.1.
Do I need a water softener in Ipswich?
Rarely. At moderately hard levels the scale is a nuisance, not damage. Descale the kettle, set appliances correctly and, for an electric hot water system, check the anode and element at service time. A scale inhibitor on the hot water feed is a cheaper middle step than a whole-house softener.
Does hard water damage hot water systems?
Scale builds on electric elements and in the bottom of storage tanks, which slows heating and shortens element life. At Ipswich town water levels it is slow. A plumber can check the element and anode when the system is serviced.
NO GUESSWORK
Scale in the
hot water system?
Slow heating, rumbling or a failed element can all come from scale. Send your suburb and what is happening, and a licensed local plumber gets back to you.