Water hardness in Takarazuka
37 mg/L soft
Tap water in Takarazuka is soft: 37 mg/L (2.1 gpg · 2.1 °dH · 3.7 °fH).
Source: Takarazuka City Water and Sewerage Bureau, tap-water quality test results FY2026 (令和8年度 検査計画に基づく水質検査結果書) (2026) · data checked 2026-11-05
Range across supply zones: 27–50 mg/L.
The figure comes from the city's FY2026 test plan results for eight tap points, but only April to September 2026 were available, with two readings per point. The 36.75 mg/L shown is the median of the eight point averages, which range from 30.5 to 46.5 mg/L, and individual readings run from 27 to 50 mg/L. It is a partial year and will be revisited when the full-year results are published. This replaces an older 2018 report that had gone out of date.
Japanese waterworks report hardness (硬度) in mg/L CaCO₃; the standard is 300 mg/L and the target 10–100 mg/L.
Water data
| Total hardness | 37 mg/L |
|---|---|
| Utility | Takarazuka City Water and Sewerage Bureau (宝塚市上下水道局) |
How Takarazuka compares
- Tap water in Takarazuka is 27 % softer than the median of the 228 cities we track in Japan (50 mg/L).
- By hardness it ranks 187 of 228 in Japan (1 = hardest); 18 % of these cities have softer water.
- In Hyogo it is number 5 of 6 cities; the regional median is 40 mg/L.
- Nearest city with clearly softer water: Tondabayashi, 40 km away (17 mg/L).
- Nearest city with clearly harder water: Ikeda, 7 km away (55 mg/L).
Ranking of the hardest and softest water in Japan →
What it means at home
- Little or no limescale in kettles, water heaters or washing machines.
- Soap lathers easily; water does not dry skin or hair.
- Dishwasher: salt setting at minimum or off.
- No softener needed; a jug filter only changes taste.
How much salt will you use for softening?
No. Water this soft does not need softening.
Descale a coffee machine or kettle about every 6 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Takarazuka
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 2 °dH |
| AEG / Electrolux | 1 |
| Beko | 1st |
| Hoover | S0 |
| LG | H0 |
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 Takarazuka water hard or soft?
It is soft: 37 mg/L as CaCO₃ (2.1 gpg, 2.1 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Takarazuka safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Japanese waterworks report hardness (硬度) in mg/L CaCO₃; the standard is 300 mg/L and the target 10–100 mg/L.
How many grains per gallon is Takarazuka water?
2.1 gpg, equal to 2.1 °dH, 3.7 °fH or 37 mg/L calcium carbonate.
What dishwasher salt setting should I use in Takarazuka?
For 37 mg/L (2.1 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in Takarazuka?
No. With soft water a softener adds nothing.
Source
Source: Takarazuka City Water and Sewerage Bureau, tap-water quality test results FY2026 (令和8年度 検査計画に基づく水質検査結果書) (2026). Method: figure published by the water supplier. Takarazuka City Water and Sewerage Bureau, tap-water quality test results FY2026 (令和8年度 検査計画に基づく水質検査結果書) · Outdated figure? Tell us