Water hardness in Xinhua
143 mg/L hard
Tap water in Xinhua is hard: 143 mg/L (8.4 gpg · 8 °dH · 14.3 °fH).
Source: Taiwan Water Corporation open data (2026) · data checked 2026-10-20
Xinhua is reported by Taiwan Water Corporation at 143.0 mg/L CaCO₃ in 2026 (customer tap water). Tainan depends mainly on the Zengwen, Wushantou and Nanhua reservoirs, with Nanhua alone supplying about 60% of daily use, plus Gaoping River water. At this level scale builds up quickly in kettles, heaters and shower heads, so a softener or scale protection is worth considering.
Taiwan Water Corporation reports total hardness in mg/L CaCO₃; the drinking-water standard is 300 mg/L.
Water data
| Total hardness | 143 mg/L |
|---|---|
| Utility | Taiwan Water Corporation |
How Xinhua compares
- Tap water in Xinhua is 13 % harder than the median of the 265 cities we track in Taiwan (126 mg/L).
- By hardness it ranks 107 of 265 in Taiwan (1 = hardest); 56 % of these cities have softer water.
- In Tainan it is number 1 of 29 cities; the regional median is 124 mg/L.
- Nearest city with clearly softer water: Xinyuan, 57 km away (93 mg/L).
- Nearest city with clearly harder water: Hunei, 18 km away (202 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 Xinhua
| Brand | Setting for this water |
|---|---|
| Bosch | H01 |
| 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 Xinhua water hard or soft?
It is hard: 143 mg/L as CaCO₃ (8.4 gpg, 8 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Xinhua 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 Xinhua water?
8.4 gpg, equal to 8 °dH, 14.3 °fH or 143 mg/L calcium carbonate.
What dishwasher salt setting should I use in Xinhua?
For 143 mg/L (8 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Xinhua?
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