Water hardness in Douliu
153 mg/L hard
Tap water in Douliu is hard: 153 mg/L (8.9 gpg · 8.6 °dH · 15.3 °fH).
Source: Taiwan Water Corporation open data (2026) · data checked 2026-10-20
Taiwan Water Corporation's 2026 tap-water data put hardness in Douliu at 153.0 mg/L CaCO₃. Surface water cannot meet demand on the Choshui alluvial fan, so groundwater is an important source here, which tends to carry more dissolved minerals. Water this hard leaves heavy limescale on heating elements and taps and shortens the interval between descaling.
Taiwan Water Corporation reports total hardness in mg/L CaCO₃; the drinking-water standard is 300 mg/L.
Water data
| Total hardness | 153 mg/L |
|---|---|
| Utility | Taiwan Water Corporation |
How Douliu compares
- Tap water in Douliu is 21 % harder than the median of the 265 cities we track in Taiwan (126 mg/L).
- By hardness it ranks 88 of 265 in Taiwan (1 = hardest); 67 % of these cities have softer water.
- In Yunlin County it is number 17 of 17 cities; the regional median is 194 mg/L.
- Nearest city with clearly softer water: Ershui, 13 km away (75 mg/L).
- Nearest city with clearly harder water: Citong, 7 km away (194 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 Douliu
| Brand | Setting for this water |
|---|---|
| Bosch | H02 |
| Miele | 9 °dH |
| AEG / Electrolux | 2 |
| Beko | 3rd |
| 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 Douliu water hard or soft?
It is hard: 153 mg/L as CaCO₃ (8.9 gpg, 8.6 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Douliu 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 Douliu water?
8.9 gpg, equal to 8.6 °dH, 15.3 °fH or 153 mg/L calcium carbonate.
What dishwasher salt setting should I use in Douliu?
For 153 mg/L (8.6 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Douliu?
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