Water hardness in Logan City
80 mg/L moderately hard
Tap water in Logan City is moderately hard: 80 mg/L (4.7 gpg · 4.5 °dH · 8 °fH).
Source: Seqwater, Water quality report – Logan (12 months to 2026-09) (2026-09) · data checked 2026-10-20
Range across supply zones: 32–150 mg/L.
Seqwater supplies Logan mainly from Wivenhoe and Somerset dams through the regional water grid. The reported hardness is 79.8 mg/L CaCO₃, with measurements from 32.0 to 150.0 mg/L. Expect light scale on taps and kettles; most homes manage with descaling.
Australian Drinking Water Guidelines: aesthetic target ≤ 200 mg/L CaCO₃.
Water data
| Total hardness | 80 mg/L |
|---|---|
| Utility | Seqwater (bulk supply) |
How Logan City compares
- Tap water in Logan City is 6 % softer than the median of the 307 cities we track in Australia (85 mg/L).
- By hardness it ranks 159 of 307 in Australia (1 = hardest); 48 % of these cities have softer water.
- In Queensland it is number 8 of 29 cities; the regional median is 68 mg/L.
- Nearest city with clearly softer water: Strathpine, 39 km away (57 mg/L).
- Nearest city with clearly harder water: Brisbane, 21 km away (117 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 Logan City
| 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 Logan City water hard or soft?
It is moderately hard: 80 mg/L as CaCO₃ (4.7 gpg, 4.5 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Logan City 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 Logan City water?
4.7 gpg, equal to 4.5 °dH, 8 °fH or 80 mg/L calcium carbonate.
What dishwasher salt setting should I use in Logan City?
For 80 mg/L (4.5 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Logan City?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: Seqwater, Water quality report – Logan (12 months to 2026-09) (2026-09). Method: figure published by the water supplier. Seqwater, Water quality report – Logan (12 months to 2026-09) · Outdated figure? Tell us