Water hardness in Ongerup
17 mg/L soft
Tap water in Ongerup is soft: 17 mg/L (1 gpg · 1 °dH · 1.7 °fH).
Source: Water Corporation, Drinking Water Quality Annual Report, aesthetic tables (great-southern), year to 2025-06 (2025-06) · data checked 2026-10-20
Range across supply zones: 15–18 mg/L.
Australian Drinking Water Guidelines: aesthetic target ≤ 200 mg/L CaCO₃.
Water data
| Total hardness | 17 mg/L |
|---|---|
| Utility | Water Corporation |
How Ongerup compares
- Tap water in Ongerup is 80 % softer than the median of the 307 cities we track in Australia (85 mg/L).
- By hardness it ranks 299 of 307 in Australia (1 = hardest); 2 % of these cities have softer water.
- In Western Australia it is number 214 of 218 cities; the regional median is 98 mg/L.
- Nearest city with clearly softer water: Jerramungup, 40 km away (12 mg/L).
- Nearest city with clearly harder water: Borden, 24 km away (26 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 Ongerup
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 1 °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 Ongerup water hard or soft?
It is soft: 17 mg/L as CaCO₃ (1 gpg, 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 Ongerup 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 Ongerup water?
1 gpg, equal to 1 °dH, 1.7 °fH or 17 mg/L calcium carbonate.
What dishwasher salt setting should I use in Ongerup?
For 17 mg/L (1 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in Ongerup?
No. With soft water a softener adds nothing.
Source
Source: Water Corporation, Drinking Water Quality Annual Report, aesthetic tables (great-southern), year to 2025-06 (2025-06). Method: figure published by the water supplier. Water Corporation, Drinking Water Quality Annual Report, aesthetic tables (great-southern), year to 2025-06 · Outdated figure? Tell us