Water hardness in Gongguan
147 mg/L hard
Tap water in Gongguan is hard: 147 mg/L (8.6 gpg · 8.2 °dH · 14.7 °fH).
Source: Taiwan Water Corporation open data (2026) · data checked 2026-10-20
Taiwan Water Corporation's 2026 tap-water data put hardness in Gongguan at 147.0 mg/L CaCO₃. Taiwan Water Corporation supplies this district; the raw-water source is not confirmed here. 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 | 147 mg/L |
|---|---|
| Utility | Taiwan Water Corporation |
How Gongguan compares
- Tap water in Gongguan is 17 % harder than the median of the 265 cities we track in Taiwan (126 mg/L).
- By hardness it ranks 97 of 265 in Taiwan (1 = hardest); 61 % of these cities have softer water.
- In Miaoli County it is number 5 of 18 cities; the regional median is 147 mg/L.
- Nearest city with clearly softer water: Miaoli, 7 km away (96 mg/L).
- Nearest city with clearly harder water: Zhuolan, 21 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 Gongguan
| Brand | Setting for this water |
|---|---|
| Bosch | H02 |
| Miele | 8 °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 Gongguan water hard or soft?
It is hard: 147 mg/L as CaCO₃ (8.6 gpg, 8.2 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Gongguan 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 Gongguan water?
8.6 gpg, equal to 8.2 °dH, 14.7 °fH or 147 mg/L calcium carbonate.
What dishwasher salt setting should I use in Gongguan?
For 147 mg/L (8.2 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Gongguan?
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