Water hardness in Guantian
124 mg/L hard
Tap water in Guantian is hard: 124 mg/L (7.2 gpg · 6.9 °dH · 12.4 °fH).
Source: Taiwan Water Corporation open data (2026) · data checked 2026-10-20
Taiwan Water Corporation reports 124 mg/L as CaCO3 for Guantian in Tainan, which falls in the hard band. We have not verified which treatment plant or wells feed this town, so the figure should be read as the utility's value for its supply, not a measurement at your tap. Expect scale on kettles and water heaters over time.
Taiwan Water Corporation reports total hardness in mg/L CaCO₃; the drinking-water standard is 300 mg/L.
Water data
| Total hardness | 124 mg/L |
|---|---|
| Utility | Taiwan Water Corporation |
How Guantian compares
- Tap water in Guantian is close to the median of the 265 cities we track in Taiwan (126 mg/L).
- By hardness it ranks 134 of 265 in Taiwan (1 = hardest); 43 % of these cities have softer water.
- In Tainan it is number 13 of 29 cities; the regional median is 124 mg/L.
- Nearest city with clearly softer water: Alishan, 60 km away (49 mg/L).
- Nearest city with clearly harder water: Neimen, 30 km away (293 mg/L).
Ranking of the hardest and softest water in Taiwan →
What it means at home
- Fast scale on taps, shower screens and kettle; white spots on glassware.
- Water heater: efficiency loss and element failures within years if unprotected.
- Dry skin and dull hair after showering are common.
- Softener recommended; jug or reverse osmosis for drinking.
How much salt will you use for softening?
Recommended, especially with a heater or boiler: scale cuts efficiency and shortens its life.
Descale a coffee machine or kettle about every 2 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Guantian
| Brand | Setting for this water |
|---|---|
| Bosch | H01 |
| Miele | 7 °dH |
| AEG / Electrolux | 2 |
| Beko | 2nd |
| Hoover | S1 |
| 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 Guantian water hard or soft?
It is hard: 124 mg/L as CaCO₃ (7.2 gpg, 6.9 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Guantian 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 Guantian water?
7.2 gpg, equal to 6.9 °dH, 12.4 °fH or 124 mg/L calcium carbonate.
What dishwasher salt setting should I use in Guantian?
For 124 mg/L (6.9 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Guantian?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
Source
Source: Taiwan Water Corporation open data (2026). Method: figure published by the water supplier. Taiwan Water Corporation open data · Outdated figure? Tell us