Water hardness in Tongxiao
147 mg/L hard
Tap water in Tongxiao 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
Tap water in Tongxiao measures 147.0 mg/L CaCO₃ in Taiwan Water Corporation's 2026 publication. Taiwan Water Corporation supplies this district; the raw-water source is not confirmed here. 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 | 147 mg/L |
|---|---|
| Utility | Taiwan Water Corporation |
How Tongxiao compares
- Tap water in Tongxiao 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, 17 km away (96 mg/L).
- Nearest city with clearly harder water: Zhuolan, 25 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 Tongxiao
| 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 Tongxiao 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 Tongxiao 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 Tongxiao 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 Tongxiao?
For 147 mg/L (8.2 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Tongxiao?
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