Water hardness in Collie
37 mg/L soft
Tap water in Collie is soft: 37 mg/L (2.2 gpg · 2.1 °dH · 3.7 °fH).
Source: Water Corporation, Drinking Water Quality Annual Report, aesthetic tables (south-west), year to 2025-06 (2025-06) · data checked 2026-10-20
Range across supply zones: 25–42 mg/L.
Australian Drinking Water Guidelines: aesthetic target ≤ 200 mg/L CaCO₃.
Water data
| Total hardness | 37 mg/L |
|---|---|
| Utility | Water Corporation |
How Collie compares
- Tap water in Collie is 56 % softer than the median of the 307 cities we track in Australia (85 mg/L).
- By hardness it ranks 272 of 307 in Australia (1 = hardest); 10 % of these cities have softer water.
- In Western Australia it is number 203 of 218 cities; the regional median is 98 mg/L.
- Nearest city with clearly softer water: Dardanup, 38 km away (28 mg/L).
- Nearest city with clearly harder water: Brunswick Junction, 32 km away (83 mg/L).
Ranking of the hardest and softest water in Australia →
What it means at home
- Little or no limescale in kettles, water heaters or washing machines.
- Soap lathers easily; water does not dry skin or hair.
- Dishwasher: salt setting at minimum or off.
- No softener needed; a jug filter only changes taste.
How much salt will you use for softening?
No. Water this soft does not need softening.
Descale a coffee machine or kettle about every 6 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Collie
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 2 °dH |
| AEG / Electrolux | 1 |
| Beko | 1st |
| Hoover | S0 |
| LG | H0 |
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 Collie water hard or soft?
It is soft: 37 mg/L as CaCO₃ (2.2 gpg, 2.1 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Collie 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 Collie water?
2.2 gpg, equal to 2.1 °dH, 3.7 °fH or 37 mg/L calcium carbonate.
What dishwasher salt setting should I use in Collie?
For 37 mg/L (2.1 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in Collie?
No. With soft water a softener adds nothing.
Source
Source: Water Corporation, Drinking Water Quality Annual Report, aesthetic tables (south-west), year to 2025-06 (2025-06). Method: figure published by the water supplier. Water Corporation, Drinking Water Quality Annual Report, aesthetic tables (south-west), year to 2025-06 · Outdated figure? Tell us