Water hardness in Tanzi
109 mg/L moderately hard
Tap water in Tanzi is moderately hard: 109 mg/L (6.4 gpg · 6.1 °dH · 10.9 °fH).
Source: Taiwan Water Corporation open data (2026) · data checked 2026-10-20
Tanzi is reported by Taiwan Water Corporation at 109.0 mg/L CaCO₃ in 2026 (customer tap water). Part of Taichung's drinking water comes from the Dajia River, where Deji Reservoir supplies municipal water. Limescale shows on kettles, taps and shower glass within weeks, which regular descaling handles; a softener is optional.
Taiwan Water Corporation reports total hardness in mg/L CaCO₃; the drinking-water standard is 300 mg/L.
Water data
| Total hardness | 109 mg/L |
|---|---|
| Utility | Taiwan Water Corporation |
How Tanzi compares
- Tap water in Tanzi is 13 % softer than the median of the 265 cities we track in Taiwan (126 mg/L).
- By hardness it ranks 170 of 265 in Taiwan (1 = hardest); 34 % of these cities have softer water.
- In Taichung it is number 12 of 21 cities; the regional median is 120 mg/L.
- Nearest city with clearly softer water: Xinshe, 11 km away (54 mg/L).
- Nearest city with clearly harder water: Houli, 11 km away (147 mg/L).
Ranking of the hardest and softest water in Taiwan →
What it means at home
- Visible kettle scale every few weeks; vinegar or citric acid is enough.
- Water heater and washing machine: some long-term scale; a scale inhibitor slows it.
- Dishwasher: medium salt setting.
- Softener optional; pays off mainly with a gas boiler or tankless heater.
How much salt will you use for softening?
Optional. A scale inhibitor or a small softener protects the heater; soap savings are modest.
Descale a coffee machine or kettle about every 3 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Tanzi
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 6 °dH |
| AEG / Electrolux | 2 |
| Beko | 2nd |
| Hoover | S1 |
| LG | H1 |
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 Tanzi water hard or soft?
It is moderately hard: 109 mg/L as CaCO₃ (6.4 gpg, 6.1 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Tanzi 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 Tanzi water?
6.4 gpg, equal to 6.1 °dH, 10.9 °fH or 109 mg/L calcium carbonate.
What dishwasher salt setting should I use in Tanzi?
For 109 mg/L (6.1 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Tanzi?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: Taiwan Water Corporation open data (2026). Method: figure published by the water supplier. Taiwan Water Corporation open data · Outdated figure? Tell us