Water hardness in Zhuolan
194 mg/L very hard
Tap water in Zhuolan is very hard: 194 mg/L (11.3 gpg · 10.9 °dH · 19.4 °fH).
Source: Taiwan Water Corporation open data (2026) · data checked 2026-10-20
Taiwan Water Corporation lists Zhuolan in Miaoli County at 194 mg/L as CaCO3, which is very hard. We have not verified the source for this town, so this is the utility's published figure for its supply. Heavy scale on heaters and fixtures is likely, and a scale-control device may help.
Taiwan Water Corporation reports total hardness in mg/L CaCO₃; the drinking-water standard is 300 mg/L.
Water data
| Total hardness | 194 mg/L |
|---|---|
| Utility | Taiwan Water Corporation |
How Zhuolan compares
- Tap water in Zhuolan is 54 % harder than the median of the 265 cities we track in Taiwan (126 mg/L).
- By hardness it ranks 45 of 265 in Taiwan (1 = hardest); 80 % of these cities have softer water.
- In Miaoli County it is number 1 of 18 cities; the regional median is 147 mg/L.
- Nearest city with clearly softer water: Dongshi, 6 km away (151 mg/L).
- Nearest city with clearly harder water: Renai, 45 km away (248 mg/L).
Ranking of the hardest and softest water in Taiwan →
What it means at home
- Severe scale: heater elements and washing-machine heaters fail early.
- Detergent use is very high; taps and screens coat within days.
- Dishwasher at maximum salt setting.
- An ion-exchange softener is practically essential; RO for drinking water.
How much salt will you use for softening?
Yes. At this hardness a softener pays for itself through appliance life and detergent.
Descale a coffee machine or kettle about every 1 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Zhuolan
| Brand | Setting for this water |
|---|---|
| Bosch | H03 |
| Miele | 11 °dH |
| AEG / Electrolux | 3 |
| Beko | 3rd |
| Hoover | S2 |
| 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 Zhuolan water hard or soft?
It is very hard: 194 mg/L as CaCO₃ (11.3 gpg, 10.9 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Zhuolan 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 Zhuolan water?
11.3 gpg, equal to 10.9 °dH, 19.4 °fH or 194 mg/L calcium carbonate.
What dishwasher salt setting should I use in Zhuolan?
For 194 mg/L (10.9 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Zhuolan?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Taiwan Water Corporation open data (2026). Method: figure published by the water supplier. Taiwan Water Corporation open data · Outdated figure? Tell us