Water hardness in Newcastle
53 mg/L soft
Tap water in Newcastle is soft: 53 mg/L (3.1 gpg · 2.9 °dH · 5.3 °fH).
Source: Hunter Water, Typical Composition of Treated Water (fact sheet, 2025) (2025) · data checked 2026-10-23
Range across supply zones: 39–74 mg/L.
2 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| mg/L | mg/L | ||
|---|---|---|---|
| Dungog Water Treatment Plant (Chichester Dam) | 49 | 49 | soft |
| Grahamstown Water Treatment Plant | 56 | 56 | soft |
Hunter Water supplies Newcastle from regional dams and, among other sources, groundwater from the Tomago sandbeds. The figure shown, 52.5 mg/L CaCO₃, is the median across 2 supply zones, which range from 39.0 to 74.2 mg/L, so it depends on which zone your street is in. Scale builds up slowly, so a softener is rarely needed.
Australian Drinking Water Guidelines: aesthetic target ≤ 200 mg/L CaCO₃.
Water data
| Total hardness | 53 mg/L |
|---|---|
| Utility | Hunter Water |
How Newcastle compares
- Tap water in Newcastle is 38 % softer than the median of the 307 cities we track in Australia (85 mg/L).
- By hardness it ranks 225 of 307 in Australia (1 = hardest); 27 % of these cities have softer water.
- In New South Wales it is number 10 of 13 cities; the regional median is 93 mg/L.
- Nearest city with clearly harder water: Taree, 130 km away (93 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 Newcastle
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 3 °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 Newcastle water hard or soft?
It is soft: 53 mg/L as CaCO₃ (3.1 gpg, 2.9 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Newcastle 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 Newcastle water?
3.1 gpg, equal to 2.9 °dH, 5.3 °fH or 53 mg/L calcium carbonate.
What dishwasher salt setting should I use in Newcastle?
For 53 mg/L (2.9 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in Newcastle?
No. With soft water a softener adds nothing.
Source
Source: Hunter Water, Typical Composition of Treated Water (fact sheet, 2025) (2025). Method: figure published by the water supplier. Hunter Water, Typical Composition of Treated Water (fact sheet, 2025) · Outdated figure? Tell us