Water hardness in Buyan
205 mg/L very hard
Tap water in Buyan is very hard: 205 mg/L (12 gpg · 11.5 °dH · 20.5 °fH).
Source: Taiwan Water Corporation open data (2026) · data checked 2026-10-20
Tap water in Buyan measures 205.0 mg/L CaCO₃ in Taiwan Water Corporation's 2026 publication. Surface water cannot meet demand on the Choshui alluvial fan, so groundwater is an important source here, which tends to carry more dissolved minerals. Hard water here scales water heaters and kettles noticeably; whole-house scale control pays off for larger households.
Taiwan Water Corporation reports total hardness in mg/L CaCO₃; the drinking-water standard is 300 mg/L.
Water data
| Total hardness | 205 mg/L |
|---|---|
| Utility | Taiwan Water Corporation |
How Buyan compares
- Tap water in Buyan is 63 % harder than the median of the 265 cities we track in Taiwan (126 mg/L).
- By hardness it ranks 31 of 265 in Taiwan (1 = hardest); 89 % of these cities have softer water.
- In Changhua County it is number 7 of 23 cities; the regional median is 184 mg/L.
- Nearest city with clearly softer water: Lugang, 8 km away (145 mg/L).
- Nearest city with clearly harder water: Neimen, 118 km away (293 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 Buyan
| 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 Buyan water hard or soft?
It is very hard: 205 mg/L as CaCO₃ (12 gpg, 11.5 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Buyan 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 Buyan water?
12 gpg, equal to 11.5 °dH, 20.5 °fH or 205 mg/L calcium carbonate.
What dishwasher salt setting should I use in Buyan?
For 205 mg/L (11.5 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Buyan?
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