Water hardness in Trentham
67 mg/L moderately hard
Tap water in Trentham is moderately hard: 67 mg/L (3.9 gpg · 3.8 °dH · 6.7 °fH).
Source: Coliban Water, Water hardness by location (CWM097, 2026-05) (2026-05) · data checked 2026-10-20
Australian Drinking Water Guidelines: aesthetic target ≤ 200 mg/L CaCO₃.
Water data
| Total hardness | 67 mg/L |
|---|---|
| Utility | Coliban Water |
How Trentham compares
- Tap water in Trentham is 21 % softer than the median of the 307 cities we track in Australia (85 mg/L).
- By hardness it ranks 184 of 307 in Australia (1 = hardest); 39 % of these cities have softer water.
- In Victoria it is number 21 of 46 cities; the regional median is 66 mg/L.
- Nearest city with clearly softer water: Laanecoorie, 74 km away (18 mg/L).
- Nearest city with clearly harder water: Tooborac, 59 km away (110 mg/L).
Ranking of the hardest and softest water in Australia →
What it means at home
- Visible kettle scale every few weeks; vinegar or citric acid is enough.
- Water heater and washing machine: some long-term scale; a scale inhibitor slows it.
- Dishwasher: medium salt setting.
- Softener optional; pays off mainly with a gas boiler or tankless heater.
How much salt will you use for softening?
Optional. A scale inhibitor or a small softener protects the heater; soap savings are modest.
Descale a coffee machine or kettle about every 3 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Trentham
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 4 °dH |
| AEG / Electrolux | 2 |
| Beko | 1st |
| Hoover | S1 |
| LG | H1 |
From each brand's manual for the model family named in the source; your model may differ, so check its manual. All brands and how to change the setting →
FAQ
Is Trentham water hard or soft?
It is moderately hard: 67 mg/L as CaCO₃ (3.9 gpg, 3.8 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Trentham safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Australian Drinking Water Guidelines: aesthetic target ≤ 200 mg/L CaCO₃.
How many grains per gallon is Trentham water?
3.9 gpg, equal to 3.8 °dH, 6.7 °fH or 67 mg/L calcium carbonate.
What dishwasher salt setting should I use in Trentham?
For 67 mg/L (3.8 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Trentham?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: Coliban Water, Water hardness by location (CWM097, 2026-05) (2026-05). Method: figure published by the water supplier. Coliban Water, Water hardness by location (CWM097, 2026-05) · Outdated figure? Tell us