Water hardness in Keelung
42 mg/L soft
Tap water in Keelung is soft: 42 mg/L (2.4 gpg · 2.3 °dH · 4.2 °fH).
Source: Taiwan Water Corporation open data (2026) · data checked 2026-10-20
Range across supply zones: 40–42 mg/L.
The city figure is the median of its districts, 41.5 mg/L CaCO₃, with district values from 40.2 to 42.3 mg/L. Taiwan Water Corporation supplies this district; the raw-water source is not confirmed here. Limescale is a minor issue at this level, mostly a thin film on kettles and shower glass.
Taiwan Water Corporation reports total hardness in mg/L CaCO₃; the drinking-water standard is 300 mg/L.
Water data
| Total hardness | 42 mg/L |
|---|---|
| Utility | Taiwan Water Corporation |
How Keelung compares
- Tap water in Keelung is 67 % softer than the median of the 265 cities we track in Taiwan (126 mg/L).
- By hardness it ranks 246 of 265 in Taiwan (1 = hardest); 7 % of these cities have softer water.
- Nearest city with clearly softer water: Xizhi, 11 km away (26 mg/L).
- Nearest city with clearly harder water: Wanli, 7 km away (53 mg/L).
Ranking of the hardest and softest water in Taiwan →
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 Keelung
| 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 Keelung water hard or soft?
It is soft: 42 mg/L as CaCO₃ (2.4 gpg, 2.3 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Keelung safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Taiwan Water Corporation reports total hardness in mg/L CaCO₃; the drinking-water standard is 300 mg/L.
How many grains per gallon is Keelung water?
2.4 gpg, equal to 2.3 °dH, 4.2 °fH or 42 mg/L calcium carbonate.
What dishwasher salt setting should I use in Keelung?
For 42 mg/L (2.3 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in Keelung?
No. With soft water a softener adds nothing.
Source
Source: Taiwan Water Corporation open data (2026). Method: figure published by the water supplier. Taiwan Water Corporation open data · Outdated figure? Tell us