Water hardness in Marong
121 mg/L hard
Tap water in Marong is hard: 121 mg/L (7.1 gpg · 6.8 °dH · 12.1 °fH).
Source: Coliban Water, Water hardness by location (CWM097, 2026-05) (2026-05) · data checked 2026-10-21
Australian Drinking Water Guidelines: aesthetic target ≤ 200 mg/L CaCO₃.
Water data
| Total hardness | 121 mg/L |
|---|---|
| Utility | Coliban Water |
How Marong compares
- Tap water in Marong is 42 % harder than the median of the 307 cities we track in Australia (85 mg/L).
- By hardness it ranks 65 of 307 in Australia (1 = hardest); 77 % of these cities have softer water.
- In Victoria it is number 2 of 46 cities; the regional median is 66 mg/L.
- Nearest city with clearly softer water: Bridgewater, 22 km away (18 mg/L).
Ranking of the hardest and softest water in Australia →
What it means at home
- Fast scale on taps, shower screens and kettle; white spots on glassware.
- Water heater: efficiency loss and element failures within years if unprotected.
- Dry skin and dull hair after showering are common.
- Softener recommended; jug or reverse osmosis for drinking.
How much salt will you use for softening?
Recommended, especially with a heater or boiler: scale cuts efficiency and shortens its life.
Descale a coffee machine or kettle about every 2 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Marong
| Brand | Setting for this water |
|---|---|
| Bosch | H01 |
| Miele | 7 °dH |
| AEG / Electrolux | 2 |
| Beko | 2nd |
| Hoover | S1 |
| LG | H2 |
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 Marong water hard or soft?
It is hard: 121 mg/L as CaCO₃ (7.1 gpg, 6.8 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Marong 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 Marong water?
7.1 gpg, equal to 6.8 °dH, 12.1 °fH or 121 mg/L calcium carbonate.
What dishwasher salt setting should I use in Marong?
For 121 mg/L (6.8 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Marong?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
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